Question about 1998 Holden VT Commodore

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Brake pedal pulsing

Only does on slow braking. Had new pads put on.

Posted by Anonymous on

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Brake pedal pulsing is very common in commodores this is well know as brake shudder .
more noticeable at speeds above 60klm.
the hot the brakes get the more noticeable.
To fix this problem you will need to replace your disc rotors and clean the hub surface and face area .
when fitting the new rotors you will need to check the run out it has to be under 0.5mm for front and 0.08mm rear .
replace pads.

Posted on Feb 22, 2015

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Skweeking brakes


Several possible causes:
  1. Did you use copper-based brake grease on the brake pins and the back of the pads?
  2. Did you clean all the old gunk off the brake pins and after doing so, where they deeply grooved? If so, you must replace them.
  3. Wrong brake pads. Some pad manufacturers list a patricular pad as being OK for a vehicle. They fit OK but the pad characteristics are wrong and they squeal like crazy or wear out in no time or give lousy raking performance etc.
  4. If the pads you removed had anti-squeal shims on the back of them did the new ones? They almost certainly should have. IIRC, they are held to the pads by some double-sided adhesive tape.
  5. If you get squeak-silence-squeak-silence... at low speed (i.e. just before coming to a halt) then the disk(s) is/are distorted. They will have to be replaced. You must not machine the discs on these brakes - there is no thickness available to do that. If you do tthey may well collapse under the heavy braking of an emergency stop with very unfortunate consequences!
  6. As someone said, the disc may be badly worn and/or grooved -check and replace if necessary.
  7. You may have a stone or piece of grit stuck between a pad and a disc. If so & it's worn a groove in the disc,you will need to replace both disc and pad.
  8. Make sure you torqued any brake bolts correctly and that you put thread sealant on them. Failure to do so can lead to them loosening in normal use. The brakes may squeak for a while if this happens but then things can get much worse...

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