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E34 (1989 - 1995)

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  #1  
Old 08-10-2014, 09:14 AM
ubersnarf ubersnarf is offline
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Location: Sunset District of San Francisco, Ca.
 
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Mein Auto: 1994 540i A
Slight "eccentric" brake pulse when coming to complete stop

Hey guys,

So I've done a lot of work on the beast as of late. Including rebuilding the entire front suspension, control arms, bushings, tie rods, new shocks/struts, mounts and springs all around. I've done the brakes as well with new pads, new OEM rotors and a brake fluid flush. I left the calipers as they were, old. Pelican parts didn't have rebuild kits in stock when I did the brakes so I had to let that go. Overall the car drives fantastic.

But it still have this issue I can't figure out.

But when I come to stop I get a slight pulse in the brakes, it's almost "eccentric" as the car is stopping and it is really only noticeable at light stopping speed. If you stand on the brakes it hard you don't notice it. It's driving me crazy as there isn't much left to replace that I haven't already done.

Could this be due to me not rebuilding the brake calipers? The caliper piston is possibly binding? Or is this possibly the ABS unit? I don't think it's the wheal bearings but you never know. I keep leaning towards caliper rebuild time, I'm curious if any one else has experienced this.

As always any input is appreciated. I would love for this car to come to a clean stop.

Cheers,

Rob
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  #2  
Old 08-10-2014, 12:10 PM
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Radian Radian is offline
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Location: Tucson, AZ
 
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Mein Auto: '91 535i 5-spd
The next logical step would be to check wheel and tire runout.

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  #3  
Old 08-11-2014, 07:50 AM
ubersnarf ubersnarf is offline
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Location: Sunset District of San Francisco, Ca.
 
Join Date: Oct 2012
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Mein Auto: 1994 540i A
That's a good point. I'm going to looking into that. I don't have a dial indicator at the moment but I did find online a " wood block method " to check tire wheel run out. Not the most precise way to check things but it could give me an idea. Thoughts?

My next question would be if my wheel run out is out of tolerance, what is the cause?
Wheel bearings?
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  #4  
Old 08-11-2014, 07:55 AM
ubersnarf ubersnarf is offline
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Mein Auto: 1994 540i A
But the tires are new and have less than 1000 miles on them...
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  #5  
Old 08-18-2014, 12:07 PM
imae34driver imae34driver is offline
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Location: Orange County , CA
 
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Mein Auto: 1995 540i SPORT /6 spd
Shake your wheel while in the air. Check for play..


I know one in a million you have to remount the tires as theres a unique flaw, sometimes you can move them from corner to corner to fix it. (Super rare) usually pulls to one side a bit not shakes.

Check tie rod ends, check new rotors for factory warpage..

Also, if you did not clean the rotors the wax coating left on to avoid rusting on the shelves may cuase wierd gripping/sliding effect till it burns off..

Goodluck
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