Topic 'Stock vs Cross Drilled or Slotted Brake Rotors' in forum 'Automotive' - dslreports.com

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 31 Jan 2013 10:14:20 EDT

ke4pym posted :

said by Subaru:

but now getting back onto brakes haha I've heard cross drilled rotors could crack if under too much stress? And slotted rotors tend to wear on the pads more on and off the brakes?

Can't speak to cross drilled. But I didn't have a wear issue on the slotted rotors when I had my VW.

Brembo slotted and Green Stuff brake pads. The front pads had 40k miles on them when I sold the car and they looked like they could go another 30k.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 17:18:56 EDT

Subaru posted : Yeah, I wonder what would happen if say one had a stuck caliper..

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 16:48:29 EDT

CylonRed posted : I have heard the same thing about drilled rotors and it makes sense since the rotor gets weakened when you take away metal.

It works for racing since you don't generally reuse rotors and pads..
--
Brian

"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 16:46:02 EDT

Subaru posted : I was thinking maybe they were running the hibeams because both low beams are blown out? lol hopefully one would be that stupid and cheap to do that..

Driving without lights I call them people that want to have a insurance claim.. no reason.. how can you see your speed??

yeah the Subarus are nice that the headlights turn off with the car but you get people that hit the parking light switch all the time wondering why the parking lights wont go off :P

but now getting back onto brakes haha I've heard cross drilled rotors could crack if under too much stress? And slotted rotors tend to wear on the pads more on and off the brakes?
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 16:36:38 EDT

CylonRed posted : Can be many reason for a lighted highway. Many people forget they have the high beams on and a lighted highway makes it less obvious from the drivers seat.

Rarely have I ever left a turn signal - usually when my mind was elsewhere and I did not hear the click.

I know folks who think that as long as they can see other cars - they are good. No lights on are a pet peeve of mine and it happens a lot. As far as I am concerned - the headlights should be on 100% of the time and it should be done via programming in the car.

When I had my first 2 Subaru's - I left my lights on all of the time and when the car was turned off - the lights went of automatically. Never needed to run them off via the stalk.
--
Brian

"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 16:31:39 EDT

Subaru posted : But what about a lighted highway ;) I often wonder how people can drive with the turn signal on for miles.. I don't know if it's just me but stuff like would drive me nuts.

Or 2 weeks ago it was around 6 Pm or so, and already dark.. this Honda suv gets in front of me.. just had no lights on at all.. but everyone else did.. How can you be in near stop & go traffic (20 MPH) and not notice your head lights are not on reflecting off the car in front of you? I guess they noticed soon after then turned them on.
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 16:08:42 EDT

CylonRed posted : Nope he isn't but that is not what I replied to.... He was wondering why other cars have their high beams on more often than before.
--
Brian

"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 14:42:25 EDT

Subaru posted : No I don't feel old until younger kids say that I'm old :(

lol but anyways that's why I ended up installing a auto dimming rear view mirror.. you have these pickup trucks with HID's in a reflector housing or what's worst is 18 wheelers with HID's in a reflector housing.. I said screw this and got the mirror for like $26 from a pick-a-part place from a 2003 tahoe and wired it up, now I can see what temp it is in the morning :) 8 F on Friday brrrr!
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 14:15:53 EDT

TA63 posted :

said by CylonRed:

I think it is because of the older drivers. AS they get older the eyesight has issues more at night.

Hey, Subaru isn't that old!

Having said that, as I have aged, I find my eyes more bothered by misadjusted headlights. -Or perhaps it is the multitude of HIDs in lenses not designed for them.
--
The talented hawk speaks French.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 10:38:23 EDT

Subaru posted :

said by CylonRed:

quote:
Also unrelated to stopping why is it that I notice more driving at night driving head on with high beams on?

I think it is because of the older drivers. AS they get older the eyesight has issues more at night.

Could be.. however I see most of the older drivers have clouded over headlights as well..

I've seen this on the highway as well and CT has enough lighting on the highway, however I think they are looking to cut back so instead of having lighting on both sides they just run them in the middle of the road on the jersey barrier, same amount of lighting but maybe 80 less lights or so.
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 10:29:37 EDT

CylonRed posted :

quote:
Also unrelated to stopping why is it that I notice more driving at night driving head on with high beams on?

I think it is because of the older drivers. AS they get older the eyesight has issues more at night.
--
Brian

"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 10:14:29 EDT

Subaru posted :

said by Rifleman:

I always drove looking as far ahead as possible--watching for cars 3 and 4 ahead braking to give me time to react.
That said I have had 2 accidents in the last 5 years from cars immediately in front of me blowing a stop sign and another just pulling onto the highway 50 feet in front of my RV. The only accidents I have ever had.

LOL one lady blew a stop sign, my road comes down a hill and I had my left blinker on, I have no stop sign and she does in which under the sign says traffic ahead has no stop sign.. She cuts in front of me and I get on the horn and she gives me the finger.. all that on a Sunday morning lol.

on the other hand I love driving in MD, VA and NC drivers who know to look ahead and look behind.

A trick I do and I know a lot of Europeans do it is if I come up behind someone that wont move say the far left lane I will put on my right blinker maybe 7 times out of 10 they will get the message and they switch the lanes without me ever having to move.

Also unrelated to stopping why is it that I notice more driving at night driving head on with high beams on? happened the other night.. I hate doing my hibeams but he got a fist full of bi-xenons and then quickly lowered his.
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 06:55:50 EDT

Rifleman posted : I always drove looking as far ahead as possible--watching for cars 3 and 4 ahead braking to give me time to react.
That said I have had 2 accidents in the last 5 years from cars immediately in front of me blowing a stop sign and another just pulling onto the highway 50 feet in front of my RV. The only accidents I have ever had.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Sat, 26 Jan 2013 00:44:41 EDT

Subaru posted : Yep 70 is the norm the speed limit signs on 95 here show 55, and I did get stopped one morning I was guilty I saw the state trooper facing the north bound side and I was the only one on the highway at 4AM so I pulled over to save him some trouble, and I told him to be honest I never noticed the speed limit, having lived here for so long he told me anything over 80 is reckless driving and they will inpound your car and take away your license, I was doing about 75 at the time but the fact that I pulled over quick enough and as the trooper said I was not Bs'ing him he wrote it as 65 instead.

I tried driving the speed limit just to see how it would be.. it's damn scary just being in the first lane!

Also since you are from NY bgraham maybe you can help me understand lol... why do all NY people do like 90 MPH at like 4 AM and no one is in front of them? I used to stay off 684 when it rained, almost all the time I would see someone that ran off the road and hit the metal gaurd rail.
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 22:35:21 EDT

bgraham posted : The only good point of living in a place where traffic laws are optional is that the unofficial expressway speed limit is 70 and the cops don't seem to bother you if you keep below 75.

The downside is that every one in 5 drivers has a friggin cell phone held up to their ear. Women seem to be the worst at this.

I don't live up in Subaru's part of the state, but I do go up there once in a while and I think 70 is the norm on I95 and the NY throughway.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 19:21:50 EDT

Subaru posted : ha I thought about calling the police just to let them know, and I will be getting a contour roam, rage cams has a nice magnet mount for the outside that looks nice :)

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 19:19:47 EDT

Juggernaut posted : I'll bet if there was a cop sitting there they wouldn't... ;)

People know they're breaking the law, yet don't give a damn until they're being surveilled. Somehow, I don't think it would go over well for insurance either.

I agree with you on the dash cam. I was thinking of getting a Go-Pro for that very reason.
--
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots." ~ Albert Einstein

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 19:14:30 EDT

Subaru posted : I wish they would get red light cameras here.. this one intersection here.. I just don't understand.. OK so you can't wait for the next cycle change.. So lets have friken 4 cars keep making a left turn on red while everyone else who has the green wait for you to make your turn..

I drive around in Westchester county sometimes and they are far better IMHO.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 19:05:25 EDT

bgraham posted : Subaru is correct. Here in New York they say a red light is not red until the bulb is warm.

Last year we just started getting red light cameras. Some idiots who got tickets started to complain that stopping for a red light was dangerous because you could get rear ended.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 19:04:28 EDT

Subaru posted : I always say they tend to make their own driving rules here.. but you know the funniest thing is they will do a full stop for a yeld sign (almost rear ended someone) but not stop for a simple stop sign..

Or today I was driving to the bank after work and the street light had went out but then came back on so it needed to be reset so the main road had the flashing yellow and the side road had flashing red.. the drivers all had the WTF to do look... It's so simple if the side road has cars and already in the intersection then you yield to them not try to cut in front of them..

I swear I will be getting a dash mounted camera because some of this stuff is like basic driving stuff.
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 18:30:49 EDT

Crash Gordon posted : As I'm approaching a red light I usually try to glance at the light from the left/right or the crossing signal to see if it's changing or about to change.

Yeah, I look for people running the light too. Just because my light is green doesn't always mean it's safe to go. :p

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 25 Jan 2013 00:04:29 EDT

Juggernaut posted : Whoa! Not too many here do that, but I always wait for 3 seconds after green just in case. Saved my ass a few times.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 24 Jan 2013 23:59:03 EDT

Subaru posted : haha same here, and since I take the same way most of the time and arrive about the same time you know how long a light is, I've notice in some sections it's timed for a 40 mph speed limit.

I'm not sure about Kelowna but a few people here will run redlights but running as in they are already red but they just go anyways.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 24 Jan 2013 23:56:06 EDT

Juggernaut posted : Same with the driver's here. I have to wonder when I see people pass me to get to a red light, as I glide toward it.

They're stopped as I go by at 25 mph.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 24 Jan 2013 23:52:14 EDT

Subaru posted :

said by Juggernaut:

That isn't confined just to CT. It's everywhere these days.

True.. but when you mix with impatient NY drivers they don't care.

It's like why if you move out of the lane (lets say the 3rd lane) and you have a car behind you, why do they speed up to only follow 2-3 seconds behind the car in front of them? I don't think I've ever seen a person not speed up to close a gap only to hit the brakes.. why not keep the same following distance?
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 24 Jan 2013 23:45:20 EDT

Juggernaut posted : That isn't confined just to CT. It's everywhere these days.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 24 Jan 2013 23:37:48 EDT

Subaru posted :

said by Crash Gordon:

One of the first things I was taught was to "look where you're going to be, not where you're at". I use that in everyday driving too (one reason I hate being behind a SUV or other large vehicle). I can't see far enough up the road to suit me. :p

Here in CT it's rare to see anyone look behind the front of the hood, I should get $5 for every time I see people just slam on the brakes because they did not look up a simple 3 car lengths ahead.
--
It's NOT Ni-kon It's NE-KON!

LG is NOT Lifes Good It's Lucky Goldstar!

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 18 Jan 2013 23:09:38 EDT

Crash Gordon posted : One of the first things I was taught was to "look where you're going to be, not where you're at". I use that in everyday driving too (one reason I hate being behind a SUV or other large vehicle). I can't see far enough up the road to suit me. :p

To my post above: Ha, just happened to get a good shot of the front rotor of the Cayman S. Yep, it's slotted and drilled. :D

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Mon, 14 Jan 2013 22:45:54 EDT

NefCanuck posted : I upgraded the pads and rotors on my Fusion to EBC slotted rotors and Hawk HPS pads and even on the street it feels like the best $1,100 I ever spent on my car. Given that an AWD Fusion weighs 3,600lbs before even my lard ass is in the car, better brakes are a must.

On the track I do a yearly event to force myself to push my eyes down the track (and by extension the road) Nothing gives you a wakeup call faster than Moss Corner @ Mosport if you aren't looking ahead and planning.

NefCanuck

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 11 Jan 2013 19:58:25 EDT

Crash Gordon posted : Yeah, sounds like it could be a fun car, with plenty of options down the road.

I'm fairly sure you'll enjoy it, but it's a expensive hobby. I don't run as much as I used to, mainly due to having other event duties while at the track, but I still get out there every chance I can.

In that vid it's also VERY wet, so it'd be wise to go a bit slower. :p

At last years Oct. PCA Drivers Ed. Porsche brought two new Cayman R with pro drivers that you could get a track tour with. It was a blast even just riding shotgun. Riding with a pro driver showed me a few things. The driver the wife and I rode with was Cass Whitehead.

The wife was a little freaked out, she'd never been that fast (about 180 down to the breaking area for 10A at Road Atlanta) before. :p

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 11 Jan 2013 02:42:55 EDT

Rifleman posted : I'm gonna go with these-----just had the rears done stock so will upgrade them down the road.
»focus.c-f-m.com/ebcfrontdimpleda···s-1.aspx
»focus.c-f-m.com/ebcredstuffrearb···cus.aspx
Here's a vid I found with an ST on the track. Sounds stock. Looks fun and slow from watching but bet things seem faster behind the wheel!

»www.youtube.com/watch?v=C80fsvz2Lpk

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Fri, 11 Jan 2013 00:32:28 EDT

Rifleman posted : Thanks for the advice. I'll go with slotted rotors and street--track pads.
The car is a good candidate I think because it's light--around 2800 pounds, has a flat torque output and responds easily to engine mods. The suspension comes from the Euro spec Focus----which was around 300HP I think. There's a turbo and intercooler kit out for it as well.
I'll try a few novice events and if I still think it's something I want to do----I'll leave the car here in storage and get another DD back home.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 23:32:19 EDT

Crash Gordon posted : Racing isn't cheap. Even for what I spend, I'm not even close to the fastest in my class (PCA Group 3), upper/mid-pack and been racing at RA (on-off) for about 15 years.

You can still have a good time, it's really not about what you brought/how fast you went. But did you have fun?

Push yourself/vehicle to the limit, but know that limit and don't exceed it. Or you might end up with "Crash" as your nickname too.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 22:26:39 EDT

Rifleman posted : It's a 2005 Focus ST daily driver being converted very slowly to track car. CrashG's budget at a weekend is half my monthly income--lol.
Central Florida Motorsports has some performance parts I was planning on ordering there.
Seeing the cost is sobering though. I don't want to win---just have a good time without holding up faster cars.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 22:11:19 EDT

Crash Gordon posted :

said by Steve:

said by Juggernaut:

And, in the case of drilled rotors, it reduces unsprung weight.

Isn't this just a couple of ounces? Is this difference even noticeable?

In racing, every ounce makes a difference.
Save a couple ounces here, a few there, it'll add up.

Even if you add the same weight back with ballast, you can place that weight where you want.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 21:59:31 EDT

Juggernaut posted : If I recall correctly, mild steel weighs .2833 pounds per cubic inch... so, depending on the drill pattern and size, it could reduce weight by a fair amount. When you apply that to the physics of the response time, it indeed makes a big difference.
--
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots." ~ Albert Einstein

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 21:51:54 EDT

Steve posted :

said by Juggernaut:

And, in the case of drilled rotors, it reduces unsprung weight.

Isn't this just a couple of ounces? Is this difference even noticeable?

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 21:25:26 EDT

Crash Gordon posted : Is this a dedicated track car? NO street aka daily driver use?
Or is it a daily driver now, thats being slowly converted to track only?

That answer will depend on what's best (also make/model).

For performance reasons, drilled & slotted rotors are the choice because of reasons posted above. (Less weight, gas dispersion).

On my (daily driver/weekend race car) 2005 Z4 3L I put Brembo GT 320mm kits all around and switch out the pads for track days/PCA (Porsche Club@Road Atlanta) events with track only pads. Once up to proper temps, track only pads work well, they WILL suck for daily use because you can't get them to maintain the proper temps.

@Tig: My weekend expenses (brakes, tires, fuel) are around $1000-1200 That doesn't count any entry fees, repairs, fixes, making sure it'll make it back-n-forth to work on Monday. :p

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 20:05:54 EDT

SwedishRider posted : Just tie an anchor to the car, and throw it out the window when you need to stop. :D ;)

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 19:53:06 EDT

Doctor Olds posted : I recommend going with bigger brake rotors with larger Aluminum calipers with more pistons. 4 piston and 6 piston calipers grab harder/longer with less effort than single or dual piston calipers and are usually lighter which reduces unsprung weight which increases handling. You may also need to Plus 1 size or Plus 2 size your tire/rim combo if the new brakes are too large for your current setup.
--
What’s the point of owning a supercar if you can’t scare yourself stupid from time to time?

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 17:14:20 EDT

CylonRed posted : I have taken a few HPDEs with 2 cars and from talking to people - a general car would be FAR better outfited with brake ducts than slotted and cross drilled rotors.

Get better pads without a doubt. Do NOT go to a track pad as they will be terrible cold. Go one down from that - I use Performance Friction Z pads and like them a lot (I use them year round).
--
Brian

"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 15:42:31 EDT

MooJohn posted : What kind of car do you have? Some brakes are better than others even from the factory.
--
John M - Cranky network guy

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 15:25:42 EDT

Juggernaut posted : And, in the case of drilled rotors, it reduces unsprung weight.

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 15:16:50 EDT

ke4pym posted :

said by Tig:

Slotting and drilling is all about shedding heat to avoid the fade and warping you mentioned.

Common misconception. Slotting/drilling isn't for cooling. It is to remove the gas buildup between the brake pad and the rotor. Thereby providing better grip between the two.

Here's a quick write up on it:
»www.brakeworld.com/slotted-rotors.asp

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 15:16:07 EDT

Steve posted :

said by Rifleman:

Are these rotors more prone to fading and warping or do they work in shedding heat faster than stock?

There's no such thing as "warping" brake rotors

Re: Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 12:36:21 EDT

Tig posted : Last summer I was guest at a club event at the local roadrace course. From what I gleaned though conversation and observation, there is no money better spent than on the brakes. A close second is suspension.
Run the best you can afford. Slotting and drilling is all about shedding heat to avoid the fade and warping you mentioned.
Ask club member what their prep/maintenance budget is on a per weekend basis for brakes, tires fuel etc. The answer may surprise you.

Stock vs Cross Drilled or Slotted Brake Rotors

Thu, 10 Jan 2013 12:08:01 EDT

Rifleman posted : I am taking a high speed driving course in the near future. A club here lets you run your car on tracks such as Sebring, Homestead etc.
I plan on keeping the car for just such purposes and modding as budget allows.
I was advised to drain and upgrade the brake fluid because many cars boil the fluid under such braking conditions. Since my rotors need replacing anyways I was debating stepping up to slotted or drilled rotors and better pads.
Are these rotors more prone to fading and warping or do they work in shedding heat faster than stock?