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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Dec-17-2010, 01:39:36 AM   #1
SlickmisterN
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Default rear passenger crunch/grind entering driveways

and really uneven pavement I get a horrid scratchy/spring grind sound. It just started after I tried to tighten the e-brake to get rid of its button rattling. Also did RTAB's recently...I had a mobile mechanic take the rotor off but he said everything looks fine. Have no clue what else it could be if its not the e-brake. The mechanic isn't a BMW specialist or anything but I would hope he's competent enough to troubleshoot a simple drum brake. Ugggggh any advice? should I get back there myself. Anything I should be looking for?
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Old Fri, Dec-17-2010, 01:45:05 AM   #2
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You might have tightened the ebrake line enough so that when the suspension moves any significant amount it engages the ebrake line. Highly unlikely, but possible.

Also possible is wheel rub.
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Old Fri, Dec-17-2010, 01:17:53 PM   #3
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Sounds like wheel rub to me. The suspension is compressing significantly on that side and the tire is rubbing on the inside of the wheel arch. If the car is not lowered this usually does not happen, so look for a shock that has blown through the rear shock mount in the tower or for a missing lower shock bolt. Also possible is whacked out rear alignment after you did the RTABs if you did not realign.
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Old Fri, Dec-17-2010, 03:58:36 PM   #4
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Quote:
Originally Posted by pbonsalb View Post
If the car is not lowered this usually does not happen, so look for a shock that has blown through the rear shock mount in the tower or for a missing lower shock bolt.
If its one of these, the car would be very bouncy on that corner OP so if you notice that then it is definitely a shock problem.
Have you tried loosening the ebrake yet? It would seem that since the noise started right after you did this, the logical thing to do would be to undo it and see what happens.
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Old Fri, Dec-17-2010, 05:34:38 PM   #5
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Check your spring seats. (rubber mats that isolate the spring from the upper control arms/body of the car)

If one of them has worn through you'll get a metallic grinding sound.

Doesn't sound like a wheel rubbing to me, that's more of a scrape-like sound, not metallic at all. Try taking that corner with the e-brake slightly engaged, see if it still makes the noise. Obviously don't drive around like that, though. LOL
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Old Fri, Dec-17-2010, 05:39:28 PM   #6
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I loosened the e-brake to point of no resistance and still got the creaking metal on metal clanking entering right hand drives. So i tightened it up to the point it was barely engaged while driving and the scratching still occurred. My car is on stock suspension except for the 90a delrin RTAB's that I put in so im confident in ruling out my tire rubbing, plus I have experience with that issue and its a different type of sound. RSM's and the bottom shock bolt are good. Could something in the strut tube be creating this noise on un-even compression? i cant re-create it just compressing the tube though, plus it sounds like rubbing in my rotor/hub cause my speed seems to reflect the sounds progressiveness if that makes any sense....
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Old Fri, Dec-17-2010, 10:31:52 PM   #7
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Quote:
Originally Posted by SlickmisterN View Post
I loosened the e-brake to point of no resistance and still got the creaking metal on metal clanking entering right hand drives. So i tightened it up to the point it was barely engaged while driving and the scratching still occurred. My car is on stock suspension except for the 90a delrin RTAB's that I put in so im confident in ruling out my tire rubbing, plus I have experience with that issue and its a different type of sound. RSM's and the bottom shock bolt are good. Could something in the strut tube be creating this noise on un-even compression? i cant re-create it just compressing the tube though, plus it sounds like rubbing in my rotor/hub cause my speed seems to reflect the sounds progressiveness if that makes any sense....
Well, check the spring pads, and now that you mention 90A delrin RTABs, you might want to check the RTAB pockets too.
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Old Sat, Dec-18-2010, 03:42:01 AM   #8
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SHAEF might have it. There has always been a bit of a groan back there and I diagnosed it to the spring pad while actually doing the RTAB's. It had a hole worn through it and was mis-seated. I rotated it to a point where the spring wasnt going through the hole and replaced it. That groan went away completely. And after a day and messing with my e-brakes this one started. Now I'm just waiting on a new lower pad. Hope this solves my problem! I guess it was foolish of me to reposition and replace the ripped/torn one.
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Old Sat, Dec-18-2010, 06:50:12 AM   #9
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Nice! Hope it stays quiet for ya!
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Old Sat, Dec-18-2010, 12:23:42 PM   #10
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How many miles have you put on the 90A Delrin RTABs? Do you like them? I have poly bushings/mounts for all available locations on my 99M3 and am now swapping the FCABs from poly to delrin, but Delrin for the RTABs seems harsh even to me for a street car.
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Discussing rear passenger crunch/grind entering driveways in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)