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Suspension & Braking Forum by BimmerWorld
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Old 03-21-2015, 06:56 PM   #1
kjaybmw
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Thud sound while braking in the snow

Guys, I am hearing a thud sound while "hard braking" braking. It only happens in the snow for the first 5-10 min while driving the car in the parking lot with a lot of stopping and going during the snow. Just started noticing about 3 weeks ago. Weird thing is that it only makes the sound when there is snow on the ground or if its extremely cold 10F or under. It cleared up in the north east for about 1 week and the sound magically disappeared. It snowed again yesterday and the sound was back. Please help!
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Old 03-21-2015, 07:25 PM   #2
NumbaOneNewb
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Maybe the brake fluid unable to work properly at that beginning cold temperature. After a while it gets up to temp
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Old 03-21-2015, 07:26 PM   #3
NumbaOneNewb
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Might want to try using that pentosin dot 4 LV brake fluid
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Old 03-21-2015, 08:59 PM   #4
mleindek
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Just asking a silly question... The noise you are saying isn't the ABS, isn't it? When it engages it makes a tratratra sound. Also, if you leave you car outside over the night it could be ice on the rotor surface or pads, after a fer brakes that ice goes away.
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Old 03-25-2015, 10:14 PM   #5
kjaybmw
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Guys thanks for the prompt response. I was away for couple of days on vacation and was off the grid (best thing in the world). @mleindek, its not the ABS sound. I know that sound very well, slipping and sliding all over winter and the ABS doing its thing. @NumbaOneNewb, I did change the brakes (pads and rotors over the summer @ 130K) but used the BMW brake fluid and bleed it correctly as well. Ironically, I came back from my break and now I hear the thud sound along with brakes sticking sound while backing up as well. Any ideas....
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Old 03-25-2015, 10:17 PM   #6
RossGuy
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Maybe something with the parking brake?
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Old 03-26-2015, 07:03 PM   #7
kjaybmw
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How do I check for that. Is there a DIY thread or have you had any experience with this issue? I am a pretty novice car guy...
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