If you roll up at like 90 MPH, and slam your brakes, will you warp rotors? just have to ask since i was debating with someone....

Check out this site, which the author posted on another brake squealing thread...

http://www.zeckhausen.com/bedding_in_brakes.htm

Short version: bringing it hard from 90 to 10 shouldn't warp anything that wasn't flawed to begin with, but bringing it hard from 90 to 0 and holding could cause problems. It seems logical that hard slowdowns shouldn't warp rotors, since they'll be heated and will then cool evenly all the way around. Holding a very hot rotor with the pad all on one small spot is another matter.

Please note: I'm only pretending to know. The author of that site is in the performance brake biz so chances are good that he actually does.

We in the UK get an advnaced driving day at ProDrive's test track.

One of the disciplines is a brake test. There are basically 4 tests.

1) Stop from 70 mph with hands on wheel :cool:
2) Stop from 70 mph with hands off wheel :)
3) Stop from the fastest you can go, from standing start (average 85-100 mph, I hit around 95, when I stopped) with hands on wheel. :D
4) Stop from the fatest you can go, from standing start with hands off wheel. :eek:

Mazda wouldn't allow us put our cars through this, if they couldn't take it. Supposedly they have change the bit of track they do this on and the speeds are increasing. I think they where having problems getting some people to go over 70. :confused:

BTW, 95-0, no hands dead straight. Now that is what I call a car.

moatz,
I assume the surface for this test is VERY flat and level? IME our tires tramline on uneven surfaces and pull the car quite noticeably, especially during hard braking.

P.S. Are you saying this bit o' fun came free with your car? I'm movin' across the pond if so!

P.P.S. Why did you let off at 95?? :D

you HAVE to be on a track for the no hands, otherwise any bumps on the road will cause the car to pull, effectively leading you into an accident! i love it.

moatz,
I assume the surface for this test is VERY flat and level? IME our tires tramline on uneven surfaces and pull the car quite noticeably, especially during hard braking.

P.S. Are you saying this bit o' fun came free with your car? I'm movin' across the pond if so!

P.P.S. Why did you let off at 95?? :D

The day is free and run by Pro-Drive, for Mazda and the instructors are there in-house driving staff. This is done in your car.

The 4 track disciplines and 1 road discipline are:

1) High-Speed performance circuit,
2) Adverse handling circuit,
3) Low Friction Circuit (skid pan, with and wihtout DSC).
4) ABS braking and avoidance.
5) Long-boring ride (compared to the track work, although the single-lane tracks were enjoyable) in the country to show you how to use the car on the open road.

If you go to http://www.prodrivelive.com/ and then click on the driver's eye tour then click on "View The Track". It will give you some idea of what we did.

The ABS braking and avoidance was run in between the high-speed and the adverse handling circuits, denoted by a solid blue band, on the diagram. Supposedly this area is specifically designed for brake testing.

It was the most fun i have had behind the wheel. In fact, it was so good I am trying to organize a corporate day out at ProDriveLive, cause I want to throw one of those rally cars around the Adverse handling circuit (the best part of the day).

The reason why I let off at 95, was there was a specifically marked area where you had to brake and that was the speed I was travelling at the time. It had probably been walked, by someone during the breaks.

My 8 and I are so jealous that it just turned Nordic Green!

I don't see the connection between the "Brake squeel" title of this post and the content, which asks about brake rotor warping????

Slamming your brakes on from high speed once or twice will not warp your rotors, but if you do it often enough to overheat your brakes then it will. By too often I mean racing on a circuit with no or very short straights (i.e. no opportunity for the brakes to cool), or driving down a very long, windy mountain road with four very BIG people in the car, a trunk full of beer, AND a caravan on the back. Now THAT could warp your discs.

I don't see the connection between the "Brake squeel" title of this post and the content, which asks about brake rotor warping????

Slamming your brakes on from high speed once or twice will not warp your rotors, but if you do it often enough to overheat your brakes then it will. By too often I mean racing on a circuit with no or very short straights (i.e. no opportunity for the brakes to cool), or driving down a very long, windy mountain road with four very BIG people in the car, a trunk full of beer, AND a caravan on the back. Now THAT could warp your discs.
people all over the forum say the way to get rid of the squeel, is to slam on the brakes.