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Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 03-20-2010, 02:14 AM   #1
rsadave
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hard brake pedal

Hey Guys,

Recently my brake pedal has become "hard" after i switch my car off. Normally if you keep pushing the pedal after the car is off the pedal becomes hard.
When I start the car the pedal is perfectly normal and brakes operate fine.
I dont think thats its the pads and rotors.
I have a feeling thats its something to do with a vacuum leak of some sorts.
Any ideas would be appreciated

Thanks
Dave
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Old 03-20-2010, 02:58 AM   #2
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The brake pedal becomes hard on just about every car when you turn it off and pump the brakes.

What car are you comparing this phenomenon to? When you turn off the engine of a car, the brake booster no longer assists the brake pedal, hence it becomes a lot harder.
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Old 03-20-2010, 03:24 AM   #3
rsadave
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Sorry what I was trying to say is that the pedal becomes hard without pumping the brake at all.
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Old 03-20-2010, 03:38 AM   #4
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Quote:
Originally Posted by rsadave View Post
Sorry what I was trying to say is that the pedal becomes hard without pumping the brake at all.
Oh... not sure about that, in that case, sorry. Best of luck finding a solution.
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Old 03-20-2010, 06:34 AM   #5
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Sounds to me like a brake booster issue, or a bad booster check valve and finally a cut or tear in the vacuum line to the brake booster. You're loosing vacuum assist when you shut the car off, which indicates a vacuum leak. Chas.
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Old 08-03-2010, 10:25 PM   #6
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Old thread, hope I get some responses as i didn't want to post a new thread.

when I take my foot off the breaks I feel like a knock in the steering wheel as well. The only time I can replicate this is when I'm taking off from a light or stop sign. Does this have any thing to do with steering column or suspension, or is it breaks related. I just bought the car its 00 with 89k miles. Any advise would be greatly appreciated.
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Old 08-04-2010, 06:32 AM   #7
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Take a look at the Front control arm bushings. With the front wheel in the air you may find there is considerable play side to side in the wheels.
There is a video posted here that shows the front wheel moving back when the driver stops.
http://forum.e46fanatics.com/showpos...09&postcount=6

Also check your steering for play with the wheel off the ground.
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Old 07-19-2011, 04:54 AM   #8
trmfreitas
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Did you solve this problem?

Hi

have you solved your problem with the break pedal?

Thank you
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Old 09-04-2013, 12:22 AM   #9
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Hi. I have a similar problem. The pedal becomes hard to press and I can't brake! Sooner or later I'll be in a tree! Taking it to the garage now but any suggestions? What it could be? Rotor? Brake calipers? Vacuum leak? Break fluid? Ahh this is crazy!
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Old 09-04-2013, 12:28 AM   #10
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You probably have a bad brake booster. It is the round can that the master cylinder bolts up to. Also, Check your vacuum to the booster. Is the ENGINE not idling good? That is usually a sign of a vacuum leak and/or a bad booster.
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Old 09-04-2013, 12:37 AM   #11
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Thanks man! My engine idles normal no problems at all. Is this repair expensive?
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Old 09-04-2013, 12:40 AM   #12
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To avoid spending money unnecessarily, Either check it out yourself or get it looked at by someone you trust. A good used or rebuilt booster shouldn't be too expensive due to the popularity of the BMW.
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Old 09-04-2013, 12:40 AM   #13
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When I brake to a hault the car steers to the right someone said left side brake not working?
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Old 09-04-2013, 12:41 AM   #14
rlatif
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Oh ok. Thanks man! I really appreciate your help! I only bought the car last week!
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Old 09-04-2013, 12:59 AM   #15
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Quote:
Originally Posted by rlatif View Post
Hi. I have a similar problem. The pedal becomes hard to press and I can't brake! Sooner or later I'll be in a tree! Taking it to the garage now but any suggestions? What it could be? Rotor? Brake calipers? Vacuum leak? Break fluid? Ahh this is crazy!
Most probably bad brake booster or broken manifold to brake booster vacuum hose, a shop will be able to pinpoint this easy
brake booster replacement diy if you're handy with tools, brake bleeding and the booster is indeed the problem
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Old 09-04-2013, 01:04 AM   #16
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Originally Posted by rlatif View Post
When I brake to a hault the car steers to the right someone said left side brake not working?
Check out your CAB's
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Old 09-05-2013, 01:02 PM   #17
rlatif
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Nightmare 318ci Coupe on Breaking

There an oil and water leak which has caused oil and water to flow into the brake servo causing dodgy braking. Had to change brake vacuum pump, front discs and pads and now cleaning the brake servo from oil, may need replacement.

All from the oil leak resulting in poor braking. If not fixed you will end up in a tree.
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Old 09-06-2013, 02:19 PM   #18
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Brake problem fixed

Just got my car back. Brakes working now. No problems. Had the brake servo replaced, brake vacuum pump, front discs and pads and bushes. Total just under 600 with all new parts and labour.
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Old 09-06-2013, 02:24 PM   #19
rlatif
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However my brake light in orange/yellow came as soon as I left the garage (couldn't go back they closed as soon as i picked it up i was running late will take it back tomorrow) and following the traction control light came on and is continuously on, both lights are and before all this my tyre pressure light in red came on but the tyres look fine but will fill with air tomorrow after going garage.

Anyone know why this could be? Brake fluid level shouldn't be low I just had all that work done? Maybe a faulty switch? Hydraulic pressure low on one of the sides of the brakes? Also felt the steering wheel take over my control for two seconds... Why could that be?
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Old 09-06-2013, 02:25 PM   #20
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Originally Posted by rlatif View Post
Just got my car back. Brakes working now. No problems. Had the brake servo replaced, brake vacuum pump, front discs and pads and bushes. Total just under 600 with all new parts and labour.
Please explain what a brake vacuum pump is?
I thought my car gets vacuum from the intake manifold for the brake booster.


PS--glad you can stop your car now

Last edited by Stinger9; 09-06-2013 at 02:25 PM.
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