What is your question?
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What is your question?
its a 2007 525i
1 Reply
Hello, it is possible that engine vacuum is tweaked just slightly when depressing the brake pedal. The power brake system utilizes a vacuum powered brake booster to supply assist to braking. This may or may not be indicating a problem with the vehicle. If the fluctuation is major, have it checked. If it's merely a minor movement and does not affect driving, then it should be OK.