Vibrating brakes

Vibrating brakes

Postby grueng [OP] » May 27th 2019, 9:48am

1992 2WD Astro LT Starcraft:
When braking cold there is almost no vibration, but when brakes are getting hotter the vibration in car and steering wheel can be huge. After driving for a while without braking is OK again.
And we are not talking about much braking before this happens.

Brake disk and pads where changed some years ago because of the same problem.
Since there is no vibration when cold i suppose it has to be the disc.

Or anyone have other suggestions?

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Re: Vibrating brakes

Postby jeff's93astro » May 27th 2019, 2:55pm

At the very least you have warped rotors on the front because of the vibration in the wheel. And since I can't drive it lol. I can't tell you if the "shake" is also coming from the front rotors so you possibly have warped drums also
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Re: Vibrating brakes

Postby grueng [OP] » May 27th 2019, 9:33pm

New test drive today. No vibrating when cold, but only a few hard stops it start to vibrate. You feel it in the entire car.
I think it is strange that they should start to vibrate with only little heat / normal braking.

I also braked more to get the discs really hot. Stopped and jacked the car up at the front. The wheels are turning free and the pads are just touching even all the way around.

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Re: Vibrating brakes

Postby fabinator » May 30th 2019, 8:52am

warped rotors will cause vibration whether or not the brakes are applied, just worse when applied. The rotors were probably contaminated with some oily crap, or the brakes were overheated then sat for awhile, causing a hard spot with different friction properties. turning the rotors may help, but you may need new ones if the hard spot goes deep enough.
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