pulsating brakes.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
pulsating brakes.
When i brake hard from high speeds, around 120MPH down to 50 MPH the brake pedal starts to vibrate ( no my ABS isent working ). But not when I brake hard from lower speeds.. What could that be?
Regards
Regards
Melting Slicks
Joined: Mar 2000
Posts: 2,225
Likes: 0
From: Georgia
Cruise-In I Veteran
Re: pulsating brakes. (devilfish)
Check your brakes carefully.
Had the same symptoms about a year ago and decided new brakes all around would be best. Upgraded 12" fronts to 13" ... new calipers, rotors, and PFZ pads. New rotors & PFZ pads for rear. Completely flushed brake fluid & used Ford high temp brake fluid (recommended by others for price & performance). Did all the work myself ... easy job & a great mod.
BTW, solved the pulsating symptoms too.
Had the same symptoms about a year ago and decided new brakes all around would be best. Upgraded 12" fronts to 13" ... new calipers, rotors, and PFZ pads. New rotors & PFZ pads for rear. Completely flushed brake fluid & used Ford high temp brake fluid (recommended by others for price & performance). Did all the work myself ... easy job & a great mod.
BTW, solved the pulsating symptoms too.
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: pulsating brakes. (tuband)
I agree, most likely your rotors are warped. I would double check this by removing the front wheels, reinstall the lug nuts on the rotor, torque to spec, then put a dial indicator on the rotor to find out how much run out you have. I don't have the manual at work, but believe spec is less than .003 inches. I measured mine during the last brake job and both fronts were about .001 or less.
There are two ways to fix this:
1. Remove rotors and have the rotors turned. Mark their position (rightor left, and position on hub) before removal. Clean back of rotors and hubs of rust scale using a wire brush. Reinstall, torque the lug nuts, measure run out with dial indicator. Should be under .001 inch but turned rotors DO NOT guaranteed to eliminate all run-out. If run-out is too much, remove rotor, and move next hub bolt, retorque nuts and measure again. If necessary, shim them between the hub and rotor. Other may have better suggestion, but you can use thin aluminum from a coke or beer can.
2. Replace Rotors. You still should check run-out upon installation as described above.
[Modified by Mez, 3:18 PM 10/1/2001]
There are two ways to fix this:
1. Remove rotors and have the rotors turned. Mark their position (rightor left, and position on hub) before removal. Clean back of rotors and hubs of rust scale using a wire brush. Reinstall, torque the lug nuts, measure run out with dial indicator. Should be under .001 inch but turned rotors DO NOT guaranteed to eliminate all run-out. If run-out is too much, remove rotor, and move next hub bolt, retorque nuts and measure again. If necessary, shim them between the hub and rotor. Other may have better suggestion, but you can use thin aluminum from a coke or beer can.
2. Replace Rotors. You still should check run-out upon installation as described above.
[Modified by Mez, 3:18 PM 10/1/2001]
