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Suspension & Braking Forum by BimmerWorld
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Old 11-07-2016, 02:15 PM   #1
Jay702
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Help please

So I just replaced my brake booster yesterday, did it all without removing the master cylinder or getting into any hydraulic lines to avoid bleeding, I got it all finished and reassembled this morning and the brakes work great!, however when I come to an immediate brake I feel hear and feel thump coming from the front, what can it be?
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Old 11-07-2016, 02:37 PM   #2
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Assume the thump is not from under the dash or near the brake booster? Probably front suspension problem, LCAB??
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Old 11-07-2016, 02:57 PM   #3
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I do need an alignment, maybe that's the problem? The thing is before the old brake booster was replaced it never did that?
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Old 11-07-2016, 03:26 PM   #4
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Do not waste an alignment on a sloppy front end. Why do you thing the car needs an alignment?

Where does the noise appear to coming from?
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Old 11-07-2016, 03:32 PM   #5
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It comes from the front end of the car near the drivers side. It only happens on immediate braking, you feel and hear a thump, other than that everything fine.
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Old 11-07-2016, 03:33 PM   #6
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It needs an alignment for sure because the steering wheel slants to the right rather than being in the middle normally.
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Old 11-07-2016, 03:33 PM   #7
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Left* sorry
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Old 11-07-2016, 03:34 PM   #8
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Just wanted to be sure you were not trying to solve a vibration problem.
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Old 11-07-2016, 04:39 PM   #9
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What did you do that could have screwed up the alignment enough to make this big thumping sound? Sure, you may need an alignment because of the pull - but it would be a huge coincidence for the thump to be related to the alignment but NOT the work you just did when the thump showed up. In other words, something you did is almost certainly related.
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Old 11-08-2016, 06:27 AM   #10
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I had a similar problem.. turned out the guy who had it before me had put on cheap aftermarket brake pads that didn't fit in the callipers properly.. Every time I braked they banged against the calliper housing producing a knock.. Easiest way to tell is to reverse slowly and then brake to a stop then drive forward and brake again you should here a metallic knock if the pads are the problem..
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Old 11-08-2016, 12:23 PM   #11
Jay702
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Quote:
Originally Posted by Schlag96 View Post
What did you do that could have screwed up the alignment enough to make this big thumping sound? Sure, you may need an alignment because of the pull - but it would be a huge coincidence for the thump to be related to the alignment but NOT the work you just did when the thump showed up. In other words, something you did is almost certainly related.
I spun out and hit a curb on my rear passenger side.
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Old 11-08-2016, 12:24 PM   #12
Jay702
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Quote:
Originally Posted by Akira053 View Post
I had a similar problem.. turned out the guy who had it before me had put on cheap aftermarket brake pads that didn't fit in the callipers properly.. Every time I braked they banged against the calliper housing producing a knock.. Easiest way to tell is to reverse slowly and then brake to a stop then drive forward and brake again you should here a metallic knock if the pads are the problem..
Thats kind of what i hear, it only happens when the car is in movement and i slam the brakes immidately, if i am not moving there is no thump or anything.
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Old 11-08-2016, 01:07 PM   #13
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did you get that lower block that is below the booster put back on the stud. its kind of a bear, and maybe during the braking decel, its moving enough to make a clunk? I did this job a few months back.......not a lot of fun
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Old 11-09-2016, 02:48 PM   #14
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Check your control arm bushings. Watch this video and compare. You'll feel and see a bad bushing
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Old 11-09-2016, 04:26 PM   #15
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Personally, I am a firm believer in, if it worked before you fixed it but not after, then fixing it is the problem. Something you did needs to be done differently. You could have any number of problems to fix, but what you already fixed is the big problem that you have right now.

My neighbor was working on his brakes just yesterday and asked me to push the pedal so he could bleed them. The pedal was not right and he was starting to get off on a tangent. I convinced him to revisit what he had already done before getting carried away on new stuff. Turns out I was right. Revisit what you did and you will find the answer.
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