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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Brake fail HELP



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      12-08-2018, 03:48 PM   #1
lowkey.e90
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Brake fail HELP

I have a 328i e90 with braking issues. Okay as I was getting off the freeway I was braking pretty hard then I turned off the dsc to "drift" a little since it was raining. Right after that my brake pedal stiffened up, so I have to apply tons of pressure to get the vehicle to stop. No lights are on as I have read on some threads that a faulty abs typically turns on brake, abs, and dsc lights. Not sure it may be the abs pump and not the abs 'computer'? Just changed the brake pads and had cleaned the calipers before the incident. I did the "booster test" which was pumping the brake pedal while the car is off, then while still pressing the brake pedal it should sink once i turned on car. the pedal is stiff at all times I'm going to bleed the brake line to see if that does it. Any info would be great, thanks in advance!
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      12-08-2018, 03:50 PM   #2
Efthreeoh
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Sounds like there is no vacuum in the brake booster.
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      12-08-2018, 03:55 PM   #3
lowkey.e90
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i unpluged the hose going to the brake booster and there is very minimal suction. does that mean the only culprit left is the brake booster?
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      12-08-2018, 04:01 PM   #4
Efthreeoh
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I don't know what engine you have. The N52 uses a vacuum pump to create vacuum because the valvetronic system doesn't create manifold vacuum. I'd hook up a mechanics vacuum to the booster and see if the pedal feels normal.
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      12-08-2018, 04:14 PM   #5
lowkey.e90
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Quote:
Originally Posted by Efthreeoh View Post
I don't know what engine you have. The N52 uses a vacuum pump to create vacuum because the valvetronic system doesn't create manifold vacuum. I'd hook up a mechanics vacuum to the booster and see if the pedal feels normal.
It's an N51. Thanks again for your input
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      12-08-2018, 04:43 PM   #6
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Quote:
Originally Posted by lowkey.e90 View Post
It's an N51. Thanks again for your input
No difference for this purpose.
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      12-08-2018, 07:09 PM   #7
Efthreeoh
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Quote:
Originally Posted by lowkey.e90 View Post
It's an N51. Thanks again for your input
The N51 has a vacuum pump.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission.
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