05-25-2023, 02:41 PM | #1 |
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Stiff Brake Pedal at Startup
I have a 2016 SDrive28i with 110k miles. Recently, I'd say within the past two weeks or so, when going to start the vehicle it has a very stiff brake pedal and I get a message in the instrument cluster that I need to press the brake pedal first to start the car. Then after pressing the pedal even harder I feel a slight click in the pedal and the car starts. Normal feeling brake pedal returns once the car starts.
Any ideas as to what could be causing this behavior? |
05-26-2023, 11:00 AM | #3 |
xdriv33
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Drives: 17' BMW x3 F25 xDrive28i xLine
Join Date: Aug 2019
Location: Toronto, Ontario, Canada
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it would throw a code.
whens the last time you did a brake fluid flush and refill as well as bleed the brake lines? this must be done every two years... |
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05-26-2023, 02:37 PM | #4 |
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I have had the same issue for a while now. I definitely think its a vacuum leak from the brake booster. Have really looked into it. Could be the booster or possibly a one-way check valve that leads to the booster.
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05-26-2023, 04:53 PM | #5 |
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05-16-2024, 02:34 PM | #6 |
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Drives: 2016 BMW X3 xDrive 35i M Sport
Join Date: Feb 2022
Location: Maryland
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I’m having this exact issue with my 16’ 35i. Firm brake pedal most mornings after been sitting for a couple hours. Replaced the grommet on the brake booster. Cheap seal. Wasn’t it. Next I might test or replace the one way valve and see what that does.
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