Junior Member
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Join Date: Oct 2020
Location: Utah
Posts: 18
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Junior Member
Join Date: Oct 2020
Location: Utah
Posts: 18
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2007 brake booster cycling a lot - some sort of vacuum leak?
So I recently noticed a hissing sound while I was driving. High pitched, almost inaudible inside the car while the engine is running. As it turns out, it's appears to be coming from the brake booster in the engine compartment. After it charges, you can hear a quite noticeable hiss that decreases in intensity until the the boost charges again.
The way I understand it, the brake booster should engage when the ignition turns on, and then again with every other press of the brake pedal (or whenever the boost needs a recharge). Mine activates with the key, takes several seconds to charge, and then re-engages after only being off for a few seconds. And it always engages with each press of the pedal.
I have an audio file of the behavior with the engine off and no pedal presses, but I don't know the best or preferred method of uploading it (either here or some other site). I'll look into that. In the mean time, any thoughts or suggestions?
Edit: I should note that aside from the booster running a lot and the hissing sound, the brakes work and I've never had a problem stopping.
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2007 SR5 4x4 (Driftwood Pearl) at 165k. Nothing special, mostly stock.
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