[bfoutch]

brake and shake, possible reason

I had a similar experience with my old 2000 Outback. It was a warped front brake rotor. Not noticeable on the flats, but severe when trying to slow down coming down a steep grade on I5 in northern California. Rotor replaced and no more problem. Usual cause is excessive heat from too aggressive braking (like having to slow quickly for a slow car in front of you) or continuous braking coming down hills. Have your dealer put a dial indicator on each rotor and check the run out. Hope this helps you narrow down the problem.

 

[bfoutch]

thanks for the new information

Subiesailor,

Thanks for the new information. Hadn't thought before about this pad deposition caused vibration, but makes sense. Here are two articles that discuss this and other types of rotor caused vibration and the proper way to bed new brakes. Hope this information provides further insight and ways to prevent this type of problem.

http://www.powerbrake.co.za/downloads/tech_01_judder.pdf

http://www.powerbrake.co.za/downloads/tech_02_bedin.pdf