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Thread: E34 brake pedal

  1. #1
    Join Date
    Jul 2020
    My Cars
    1989 BMW E34 525i m20b25

    E34 brake pedal

    Hello guys, today i washed the car. After that, the brake paddle was hard, and it was barely braking. After 15 mins of driving, it worked fine. Same thing happened when it was raining last month. What can the problem be?

  2. #2
    Join Date
    Jan 2015
    Tempe, AZ
    My Cars
    1992 525i/5
    I'd check your brake booster to make sure water isn't getting into it somehow, and then after that I'd check the brake booster check valve to make sure it's not broken in some way. Both of those would cause a hard brake pedal.
    1992 525i 5-speed - Thread

  3. #3
    Join Date
    Aug 2010
    My Cars
    A few e34s
    Yep, brake booster. Maybe it rusted out and takes in moisture through the rust pores and collecting water inside. And/Or a perished vac line.

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