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Suspension & Braking Forum by BimmerWorld
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Old 04-21-2016, 06:42 PM   #1
Boolala
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Have to ask--very slight knock when braking

Just so you know, about a month ago I changed all 4 rotors & pads, both front calipers, bled brakes and also replaced front lower control arms with inner and outer joints and bushing (used the Urethane Control Arm Bushing from Bavarian Auto). Had the front end aligned and tires spun balanced and rotated. All was good and still good but I hear a very light knock (just one time) when going at slow speeds like in traffic moving foot by foot and when you brake there is a very slight knock in the front somewhere.,

If my music was up just a tad you wouldn't hear it but thought I would ask. Checked everything visually and rechecked the torque on the lug nuts--all good.

Ideas maybe?
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Old 04-21-2016, 07:04 PM   #2
hitbyastick
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Swaybar end links perhaps. Do you hear anything going slowly over smaller bumps? Find a spot somewhere where there are lots of small bumps one after the other, drive slow over it and listen for the noise.
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Old 04-21-2016, 08:28 PM   #3
Sapote
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I have no answer, but wonder the reasons to change the two front calipers?

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Old 04-21-2016, 08:52 PM   #4
Boolala
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Quote:
Originally Posted by Sapote View Post
I have no answer, but wonder the reasons to change the two front calipers?

Sapote
One was stuck closed so I changed both. It was causing major front end shake. Common thing on these cars I guess.
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Old 04-22-2016, 01:06 PM   #5
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I see. One piston seized in the caliper. Usually the cause is that the rubber dust boot was damaged allow moisture to rust the chrome coated piston. For this one can buy a set of piston o-ring and boot and rebuild it -- fairly easy and fun.
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Old 04-22-2016, 01:50 PM   #6
WDE46
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What brand pads did you buy?
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Old 04-22-2016, 01:51 PM   #7
BKMrSteel
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I have a clunk in my front brakes, only once each time. It happens when I use them in reverse once, and then again after driving foreword once. If this is what you are experiencing, I have chocked it up to the pads shifting slightly.
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Old 04-22-2016, 02:04 PM   #8
WDE46
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My Akebono pads did this. My Pagids do not and my Ate pads did not.
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Old 04-26-2016, 12:23 PM   #9
Boolala
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Ya it's just once each way and I just turn the radio up now!
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