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Old 04-17-2007, 05:49 PM   #1
Mavrick
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Vibration while braking 95 525i

While moderatly braking at highway speeds, i get a vibration of the front suspension (in the steering wheel). Doesn't feel like warped rotors, and is only aparent above 70-80km/h or so. I think i remember reading about some bushings that are common to wear out and cause this issue, so i was hoping someone could point me in the right direction.

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Old 04-17-2007, 08:16 PM   #2
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it can still be rotors, I had a similar problem.
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Old 04-17-2007, 11:28 PM   #3
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Well, under 80clicks its not there, but over 80 clicks or so the vibration is fairly violent, this is why I don't think it's rotors. The brakes were done probably 1 year ago, BMW parts.
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Old 04-18-2007, 12:16 AM   #4
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hm yea bmw rotors shouldn't be doing that. I had zimmerman's and it started to do exactly what you described after about 3 months.

Check your thrust arms, might related to the "55mph shimmy".
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Old 04-18-2007, 12:52 AM   #5
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http://bmwe34.net/e34main/trouble/front_noises.htm
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Old 04-19-2007, 07:31 AM   #6
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Quote:
Originally Posted by Gamite
hm yea bmw rotors shouldn't be doing that. I had zimmerman's and it started to do exactly what you described after about 3 months.

Check your thrust arms, might related to the "55mph shimmy".
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Old 04-25-2007, 12:05 AM   #7
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"fairly violent" a term more often than not means front brake calipers just starting to seize. If your brakes were done one year ago check to see if you were billed for calipers or " rebuilt" ones. If the rotors were not done, turned or replaced then the calipers weren't overhauled. If it only happens when braking then Thrust Bushing. BBBBut if it shakes for short periods when not on the brakes it is the calipers almost always. EDIT Crap hit the dam post button again. Moderate pressure also suggests calipers. The bushings shake under heavy load. Most often it is a combo of things.

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Old 05-10-2007, 12:38 PM   #8
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I have the same problem i replaced everything in the front end except callipers, rotors a year ago. shaking at 80 85 90 kpm with or with out stepping on the brake any sugestions. I am going to service my callipers this weekend. My rims are beyern 18" mesh they fit tight i don't think i need hubrings?


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Old 05-11-2007, 08:32 AM   #9
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Vibration Under braking

The cause is more likely the upper thrust arm bushings, this is a very common failure that will cause violent vibration under moderate braking.

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Old 05-11-2007, 01:02 PM   #10
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[quote=MANDD]The cause is more likely the upper thrust arm bushings, this is a very common failure that will cause violent vibration under moderate braking.

Mark.


+1

but still check the rotors, calipers, all the bushings while you are at it.
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Old 05-14-2007, 12:07 AM   #11
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how does one service the calipers?

I have a similar problem. Replaced the rotors a few month ago. Now I get pretty violent shake if braking at high speed. I toiok my car to a shop and checked the suspension a couple days ago. Everything is perfect. So everything points to the rotors - but I changed them only recently! ... so may be it's the calipers that fry the rotors....
so now the question again ... how do I service the calipers?
thanks guys
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Old 05-14-2007, 07:17 AM   #12
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Usually its the sliders that are serviced, freed up and lubed.

The caliper itself is usually rebuilt or you can buy a rebuilt one, but that only necessary if the piston is siezed.
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Old 05-14-2007, 11:06 AM   #13
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I serviced the calipers and noticed big inprovements while braking. Shaking at around 80 90 k. is not as bad. Also I torked the wheels 3 to 4 time durring the weekend it also helped. I have 18" Beyron wheels and they seem to have to be really tight to be smooth ride.
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Old 05-14-2007, 12:29 PM   #14
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How much do you trust the shop that said everything is "ok"? It sounds like ball joints in the thrust arm bushings to me. A warped rotor is easy to spot: jack up the car and spin the wheel. If its warped, it will spin free for a moment, then drag. It should slightly drag evenly all the way around. If it does this, its thrust arms. Use a lever (a pry bar, etc) to put pressure from all sides on the ball joints and look for the slightest movement in the ball joint assembly. Any slack, and they need replacing.
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Old 05-14-2007, 12:29 PM   #15
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Check *all* ball joints while you're there, and steering box slack too. See the BMWE34.net site for instructions.
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