bent/bad rotors?
Thread Starter
Registered User
Joined: Apr 2004
Posts: 139
From: Bum Fak SD right now...
bent/bad rotors?
I recently rebuilt all four calipers put steel braided lines and new pads in. i have improved braking capability, however, when i first apply pressure to the brakes (mostly at higher speeds) my brakes, mainly passenger front, shutter and vibrates the car...the only thing that comes to mind is possible rotor problem. Does anyone have some input for me? Also i know the brake system is bled. i bled the whole system somewhere close to 10 times within the last month...so it isnt the problem. Thanks for any help!!
Administrative Brown Guy
Joined: Jun 2003
Posts: 5,406
From: Ontario, Canada
you put in new pads right?
did you have the rotors cut before you installed the new pads? if not then you more than likely warped the rotor.
Whenever you do brakes you should measure the thickness of the rotors to make sure they have enough left on them to do their job. If the rotors are too thin or will become too thin during the new pads life cycle then they'll warp causing the shaking you're experiencing. It'll also affect your braking performance negatively.
did you have the rotors cut before you installed the new pads? if not then you more than likely warped the rotor.
Whenever you do brakes you should measure the thickness of the rotors to make sure they have enough left on them to do their job. If the rotors are too thin or will become too thin during the new pads life cycle then they'll warp causing the shaking you're experiencing. It'll also affect your braking performance negatively.
Jack Of All Trades
Joined: Jun 2004
Posts: 2,296
From: Acton, California
If you look on the original rotors there is a yellow paint mark by one of the stud holes with a corresponding yellow paint mark on one of the studs.
These should line up. If the paint marks aren't there, or you have aftermarket rotor, the FSM tells you how to measure the runout of the rotors.
It goes something like: install rotor, using a dial indicator, turn rotor and measure runout, if the actually runout exceeds .002", remove rotor and rotate to the next lug hole, re-measure runout. Keep doing this until you find a position where the runout doesn't exceed .002". If this cannot be achieved take the car to a place that can turn the rotors while they're mounted on the car..
This would apply to any situation where you've had the rotors turned and/or replaced.
These should line up. If the paint marks aren't there, or you have aftermarket rotor, the FSM tells you how to measure the runout of the rotors.
It goes something like: install rotor, using a dial indicator, turn rotor and measure runout, if the actually runout exceeds .002", remove rotor and rotate to the next lug hole, re-measure runout. Keep doing this until you find a position where the runout doesn't exceed .002". If this cannot be achieved take the car to a place that can turn the rotors while they're mounted on the car..
This would apply to any situation where you've had the rotors turned and/or replaced.
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