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Old 08-09-2015, 03:12 PM   #1
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Not Warped Rotors... What Is It?

I have a 2000 Boxster S with factory rotors and pads. Have done several DEs with no issues. This weekend I experienced the followingIn the middle of day #2 the following started to happen:
When the brakes were hot and I was doing heavy breaking from high speeds (example breaking from ~ 115 mph the car felt like I was braking on a "washboard" surface, meaning that the car became a bit unstable and started to "wobble"

This was NOT the ABS, which feels different, I also did not have brake fading and I had pretty much the same brake distance as before, so the brakes generally still worked great. And it only happened after a few laps when the brakes were hot.

When the brakes are cold everything feels normal. I checked runout and have 0.001" or less on each rotor, no cracking or signs of any pad material buildup. Pads have at least 8mm of material left.

Ideas?..

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Old 08-09-2015, 03:30 PM   #2
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My guess is that the pad material was being deposited unevenly on the rotor when very hot, then scrubbed off on slower corners and when driving normally. I would suggest trying a higher temp brake pad.
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Old 08-09-2015, 04:00 PM   #3
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Are you sure they are not warped? What method did you use to check? Loosen the lug nuts and re-torque them properly. Uneven torque on the lug nuts can cause this.
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Old 08-11-2015, 05:57 PM   #4
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Quote:
Originally Posted by cas951 View Post
Are you sure they are not warped? What method did you use to check? Loosen the lug nuts and re-torque them properly. Uneven torque on the lug nuts can cause this.
Check the torque on your brake caliper mounting capscrews? (Make sure not loose)

I mention it only because I recently noticed mine were a lot less torqued than they should be. They seem like pretty important fasteners to not come loose!
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Old 08-11-2015, 06:41 PM   #5
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Hub Centric

you might explore this route
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Old 08-11-2015, 07:57 PM   #6
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Mr. Stone is correct imho. Solve by fitting top quality pads. Hawk, EBC,Akebono ?Others will mention their favorites.

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