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I have a 2000 Mazda MPV that is getting a loud humming sound coming from the engine compartment when the brakes are applied. The pedal also is not as firm when this episode occurs. It also happens sporadically. The brakes were worked on by a major brake chain about 2 1/2 months ago and this is when it started. This sound never occurred prior to this.

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This sounds like a power brake motor problem. If it happened right after you got that work done I would take it back there and see what they have to say. I have heard of some of these symptoms coming from air in the brake lines. If it is the brake motor it might just be coincidence that it started happening after that work got done.

Posted on Oct 05, 2010


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