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Discussion Starter #1
hello all just got my fj installed a new headunit tonight and noticed the car would make a buzzing sound ever minute or so from the brake master cyl/booster area...

I have no idea what it is doesn't feel like anythings wrong just a weird noise.


thanks for the help!
 

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Does the noise happen when you step on the brake pedal? If so, it's normal. FJ uses compressed air for the brake booster (instead of vacuum) and the noise comes from a small electric compressor that replenishes the compressed air reservoir after 2 or 3 applications of the brake pedal. On the other hand if it happens every two or three minutes without using the brakes, than there is a leak and it needs to be fixed ASAP.
 
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