Brake pedal height

#1
Good morning to all, i have a 3500 v8 auto, and have a question regarding front brakes.
I am sure my front brakes are not fully moving away from the discs, they are not binding at all, but enough to make a very annoying low pitched grinding noise when driving, I have checked the pads, discs, shims, pins etc also well coated with copper grease.
I have now checked my brake pedal height ( having read on the forum various items on this), my pedal sits at 6" from the floor, which is low according to what i have read.
Could this low height be related to the brakes not being fully released? and if so is it just a case of release the lock nut and adjust the push rod to move the pedal up.
Many thanks Steve.
 

jp928

Well-Known Member
#2
If you have the requisite free play the height should not be relevant to brakes dragging. Book says bottom of pedal pad should be 6.5-6.75" above the FLOOR - ie, bare floor, free of carpet. As you say, undo the locknut, screw pushrod until correct height achieved. Free play should be ~ 1/16". A grinding noise would indicate the disc surface needs work, or there is grit in the pad? There maybe a m/cyl issue, or the caliper pistons have corroded surfaces, preventing them from retracting properly. Check the temperature of the front wheels after a decent run - more just a run around the block. A good way to test for brake drag is to get on an empty stretch of very slight downhill road, drop gear into neutral and let it roll to a halt - brake drag will show up as a small lurch as the car stops. If you dont feel a lurch, brakes are not dragging. If you do feel a lurch, feel the wheels for heat.
 
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colnerov

Well-Known Member
#4
Hi, To be satisfy yourself the master cylinder is releasing, do a headstand in the footwell and pull the rubber boot back off the master cylinder and check that the piston comes back and touches the circlip.

Colin
 
#5
Adjusted the pedal height, and as usual you are right, noise still there. very low pitched grinding noise, passengers say they can not hear it, but i know its there, need to do more checks.
 
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