Hello all,
Been doing lots of searching but I can't figure out what is happening. E30 vert has a grind/scrape/grab (for lack of better words) while normal braking that starts at about 20 to 0 mph and then again from 0 to about 20 mph. The noise is not constant, it is a grind/scrape/grab once every revolution of the wheels. It seems to be coming from the rear. It seems to stop after about 20 mph. Here is what I've done to try to figure it out/remedy:
- Hard braking - It doesn't grind/scrape/crunch
- Hard acceleration from 0 - Does it for a split sec and then disappears
- Swerved left/right while grind/scrape/crunch is happening - No change
- Jacked car and rotated wheels - No perceivable noise other than faint differential gears rotating and light brake pad noise
- Cleaned calipers and ensure pistons are free( cleaned slide pins, caliper piston, cleaned and greased pad contact areas) - No change
- Replaced both rear rotors (used same brake pads cause they where new) - No change
- Checked and adjusted ebrake - No change
- Checked for evidence of rubbing on dust plates, parking drum back plates, caliper and old disks and found nothing
- There is no clicking sound or evidence of wheel bearing or CV join problem
- There is no steering wheel shake or shimmy. There is however a slight vibration I can feel in the seat of my pants.
- Straight line braking is perfect
- Alignment could be better but is not bad as it is
- Tires are wearing evenly
I'm stumped and need you guy's help if you care to chime in. Perhaps some of you have encounter this problem before.
Here is what I'm thinking
Maybe bent wheel hub? But wouldn't that manifest itself at any speed?
Maybe a bad wheel bearing? But that is typically described as a humm and it is constant and changes with load?
The right axle is leaking grease (strange because the grease is right where the axle splines go into the wheel hub and the rubber boot does no seem to reach there ) Could this have anything to do with it?
Could it be a carrier bearing in the diff (there is no humming or any sound from the differential while driving, coasting or under load)
Could a drive shaft bearing exhibit these symptoms?
The suspension is in need of refreshing (it is a 23 year old car after all)
Anyways, as you can see I'm loosing my mind. Any help figuring this out is greatly appreciated. Thanks a bunch.
Been doing lots of searching but I can't figure out what is happening. E30 vert has a grind/scrape/grab (for lack of better words) while normal braking that starts at about 20 to 0 mph and then again from 0 to about 20 mph. The noise is not constant, it is a grind/scrape/grab once every revolution of the wheels. It seems to be coming from the rear. It seems to stop after about 20 mph. Here is what I've done to try to figure it out/remedy:
- Hard braking - It doesn't grind/scrape/crunch
- Hard acceleration from 0 - Does it for a split sec and then disappears
- Swerved left/right while grind/scrape/crunch is happening - No change
- Jacked car and rotated wheels - No perceivable noise other than faint differential gears rotating and light brake pad noise
- Cleaned calipers and ensure pistons are free( cleaned slide pins, caliper piston, cleaned and greased pad contact areas) - No change
- Replaced both rear rotors (used same brake pads cause they where new) - No change
- Checked and adjusted ebrake - No change
- Checked for evidence of rubbing on dust plates, parking drum back plates, caliper and old disks and found nothing
- There is no clicking sound or evidence of wheel bearing or CV join problem
- There is no steering wheel shake or shimmy. There is however a slight vibration I can feel in the seat of my pants.
- Straight line braking is perfect
- Alignment could be better but is not bad as it is
- Tires are wearing evenly
I'm stumped and need you guy's help if you care to chime in. Perhaps some of you have encounter this problem before.
Here is what I'm thinking
Maybe bent wheel hub? But wouldn't that manifest itself at any speed?
Maybe a bad wheel bearing? But that is typically described as a humm and it is constant and changes with load?
The right axle is leaking grease (strange because the grease is right where the axle splines go into the wheel hub and the rubber boot does no seem to reach there ) Could this have anything to do with it?
Could it be a carrier bearing in the diff (there is no humming or any sound from the differential while driving, coasting or under load)
Could a drive shaft bearing exhibit these symptoms?
The suspension is in need of refreshing (it is a 23 year old car after all)
Anyways, as you can see I'm loosing my mind. Any help figuring this out is greatly appreciated. Thanks a bunch.
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