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Old 12-08-2007, 06:55 PM   #1
steve318ti
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Default Brake pedal shakes in snow...what it can be?

When I drive in dry condition I have never face this problem.
Yesterday coming from work (snowing in CT) I step the brake pedal all the way down the ramp in LOW speed. I felt the brake pedal SHAKE and a weird noise comming from under the front wheels.
After driving my car at 20 mph I brake many times everything ok. When I step the brakes all the way down again I felt the same shaking, rumbling feeling in the brake pedal. When I push the brake a little I didnt feel anything.
Today ( nice and sunny) I drove my baby again step in the brakes nothing wrong.
What issue I am dealing with?
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Old 12-08-2007, 07:19 PM   #2
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Quote:
Originally Posted by steve318ti View Post
When I drive in dry condition I have never face this problem.
Yesterday coming from work (snowing in CT) I step the brake down the ramp in low speed. I felt the brake pedal shaking and a weird noise comming from under the front wheels.
After driving my car at 20 mph I brake many times everything ok. When I step the brakes all the way down again I felt the same skainng, rumbling feeling in the brake pedal. Today ( nice and sunny) I drove my baby again step in the brakes nothing wrong.
What issue I am dealing with?
It's called anti-lock brakes (ABS). It keeps the wheels from locking up. If you hear that, it means you should slow down.
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Old 12-08-2007, 07:26 PM   #3
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It's called anti-lock brakes (ABS). It keeps the wheels from locking up. If you hear that, it means you should slow down.
I was less than 10 mph!!!!!! only happens when I was driving in snowy roads....
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Old 12-08-2007, 07:51 PM   #4
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Quote:
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I was less than 10 mph!!!!!! only happens when I was driving in snowy roads....
Take the owner's manual out for a read. Some interesting facts when driving in snow.
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Old 12-08-2007, 08:04 PM   #5
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Not have one!
Just using my common sense I know that there is something wrong with the brakes ... I guess....just when I step all the way down the brake pedal in snow I feel that shaking and bumps feeling in my foot (that one in the pedal) seems that thecar car brake and get stauck with something... and I hear a weird humming sound front the hood.
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Old 12-08-2007, 08:10 PM   #6
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yep, that would be the ABS pulsating your brakes (ie doing what they're supposed to do).
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Old 12-08-2007, 08:10 PM   #7
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ABS and ASC-T kicking in.
I believe the owner's manual says to turn ASC-T off.

What tires are you running?
Seems odd to kick in that slow.
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Old 12-08-2007, 08:26 PM   #8
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I am running 17's with Pirelli Super Sport.
It happend with the ASC on and ASC off..... I feels that something is being grinding under my brake pedal....
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Old 12-08-2007, 08:29 PM   #9
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ABS works regardless of ASC. what kind of snow traction do you have? those don't sound like winter tires. if your traction is poor, the ABS will sense lockup and do exactly what it's doing.
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current mods: bilstein sports, bavauto springs, e30 m3 LCABs, solid metal ball joints, bavauto RSMs w/reinforcements, e30 3.73 LSD & halfshafts, supersprint cat-back exhaust, turner rear sway bar reinforcements, IE poly subframe & RTABs + camber/toe kits, powdercoated e36 32x front calipers, sport mirrors, H&R 28mmF/19mmR sway bars, x-brace, auto solutions SSK w/poly bushing upgrade, BMW CD43 head unit, DICE HD Radio w/iPod integration and "stealth" HD antenna, staggered style 68s, orange electronic TPMS, leather arm rest, JT Designs metal undertray

acquired and awaiting install: heated seat kit, cali top switch relo, lumbar support kit, park distance control kit, heated washer nozzle kit, m-coupe rear subframe, trailing arms, differential, and halfshafts, m-coupe front/rear brakes with master cylinder, under hood light kit, mud flaps, rear sun blind, auto-dimming rear view mirror, tilt steering wheel retrofit, apexcone 5000K HIDs with 55W ballasts




2002 X5 4.4 Sport Package, 53.5k miles
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Old 12-08-2007, 08:40 PM   #10
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http://auto.howstuffworks.com/anti-lock-brake3.htm
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Old 12-08-2007, 08:40 PM   #11
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Well they are Four season Tires. How this ASC thing work?
Why that rumble, shaking feeling and humming sound?
When I drive in snow goes normal or when I brake slow. just when I step all the way down with the brake pedal.
Why only when I brake?
Thanks guys for your help guys!!!
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Old 12-08-2007, 08:51 PM   #12
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Thanks Aceyx! I think ABS is what is happening but the shake is so violent that makes me think something is wrong!
I think I am wrong.
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Old 12-08-2007, 09:02 PM   #13
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ASC is the traction control system and it utilizes ABS as well as throttle control. ABS operates on its own as well in braking situations where it senses the wheels locking up (therefore losing braking power/control).

i must say, the first time my ABS came on, it kinda freaked me out. it does seem like something is going wrong, but it's not
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1996 318ti, California package, 267k miles
current mods: bilstein sports, bavauto springs, e30 m3 LCABs, solid metal ball joints, bavauto RSMs w/reinforcements, e30 3.73 LSD & halfshafts, supersprint cat-back exhaust, turner rear sway bar reinforcements, IE poly subframe & RTABs + camber/toe kits, powdercoated e36 32x front calipers, sport mirrors, H&R 28mmF/19mmR sway bars, x-brace, auto solutions SSK w/poly bushing upgrade, BMW CD43 head unit, DICE HD Radio w/iPod integration and "stealth" HD antenna, staggered style 68s, orange electronic TPMS, leather arm rest, JT Designs metal undertray

acquired and awaiting install: heated seat kit, cali top switch relo, lumbar support kit, park distance control kit, heated washer nozzle kit, m-coupe rear subframe, trailing arms, differential, and halfshafts, m-coupe front/rear brakes with master cylinder, under hood light kit, mud flaps, rear sun blind, auto-dimming rear view mirror, tilt steering wheel retrofit, apexcone 5000K HIDs with 55W ballasts




2002 X5 4.4 Sport Package, 53.5k miles
Current Mods: e46 m3 steering wheel
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Old 12-08-2007, 09:17 PM   #14
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Thanks guys!!!
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Old 12-09-2007, 12:54 AM   #15
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it's is not that violent. trust me. the one day that you're in the rain doing 35mph behind some guy who suddenly slams on his brakes and you slam on yours pressing all the way down and feel the ABS kick in and your car still continues to inch closer towards that idiot's bumper and the only reason you didn't hit him was because the guy changed his mind or whatever and starting driving again at the last second. . . then you'd really appreciate it.
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