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Buzzing/vibrating noise by pedal

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New User

Jun 6, 2022, 6:22 PM

Post #1 of 2 (1089 views)
Buzzing/vibrating noise by pedal Sign In

I have a 2008 Mazda 3 hatch 2.0 with 116,000km
The noise is like a buzzing, pulsating light vibration noise I dont know how else to explain it, everyone was telling me it was the engine mounts, I knew deep down it wasnt because it felt more to do with the pedal, so I got my mounts replaced and its still there, but I am happy to have the mounts replaced anyways. my guess was something to do with the pedal or some sort of linkage or abs. Im not mechanically inclined. It happens when at very low rpm or stopped with foot on the brake or putting it from park to drive, and mostly when the car is cold but can linger when warmed up, its not an actual vibration that you would get when the car shakes from the engine and it doesnt happen when im actually driving. Its such an odd one to track down but im so desperate to figure it out. (all brakes and rotors were just done and it was happening before and no engine lights are on) I have attached a video thats the best sound I could get from it.

(This post was edited by xthrones9 on Jun 6, 2022, 6:32 PM)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 7, 2022, 4:00 AM

Post #2 of 2 (1058 views)
Re: Buzzing/vibrating noise by pedal Sign In

It appears to have something to do with vacuum supply to the booster. This car has a check valve built into the vacuum line from the engine and my guess is there is an issue with the amount of vacuum supply or the check valve in the line.

One way to test the theory is to remove the vacuum line from the booster and attach a vacuum gauge and see if the gauge mimics the pulsing vibration.


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