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E34 (1989 - 1995)

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  #1  
Old 08-10-2014, 10:14 AM
ubersnarf ubersnarf is offline
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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, 01:10 PM
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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, 08:50 AM
ubersnarf ubersnarf is offline
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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, 08:55 AM
ubersnarf ubersnarf is offline
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But the tires are new and have less than 1000 miles on them...
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  #5  
Old 08-18-2014, 01:07 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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  #6  
Old 09-28-2014, 09:34 PM
BMW_Stu BMW_Stu is offline
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I have noticed mine does this as well. I notice it if i'm creeping while on the brakes, less than 1mph. I don't feel it in normal braking, or when coming to a stop, only at creep speeds. Did you ever figure this issue out?
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Old 09-29-2014, 10:33 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
I did get it resolved. I don't know why I did not consider this earlier- rear brakes. I rebuilt the rear brakes , new rotors and pads. Problem solved.

The car now comes to a stop ever so smoothly. There was plenty of life left on the old pads, the rotors looked good but maybe they were somewhat warped.
That's why I didn't consider it, visually it looked like i had a least another 10-15k left on them. I guess I was wrong, but I was pleasantly surprised when that fixed it.

Moral of the story- sometime the fix is right in front of your face.
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  #8  
Old 10-08-2014, 11:18 AM
MeNoo MeNoo is offline
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Mein Auto: 1990 BMW E34 525i
That's why they told you to check runout....
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