Buzzing sound...Help!

[CST 03]

Anyone have any ides what the buzzing sound could be comming from either under the dash or under the hood on the driver side? It does it for like the first 15 to 20 minutes after i start the car and then it quits but then starts again when I apply the brakes. Its driving me crazy. I replaced the brake accumulator bowl/ball a couple months ago and the brakes have been working fine, but now i have this buzzing sound.

Thanks!

 

[TurboDave]

Open hood, apply brakes with engine running, or key on engine off..... Is buzzing coming from powermaster?

 

[CST 03]

Open hood, apply brakes with engine running, or key on engine off..... Is buzzing coming from powermaster?

Yes, it is comming from powermaster. I turned the key to accesory (car not running) and it was buzzing.

 

[CST 03]

So do i need to replace the whole powermaster????

Anyone???

 

[TurboDave]

Could be a bad pressure switch. Get closer and see/hear if that's what it's coming from. Sometimes that switch can make some wierd noises/symptoms.

 

[CST 03]

Could be a bad pressure switch. Get closer and see/hear if that's what it's coming from. Sometimes that switch can make some wierd noises/symptoms.

If that is the problem, where might i find one and are they expensive??

Thanks, TurboDave for your help.:smile:

 

[williamsGN]

1985 1986 1987 Buick Regal Grand National Turbo T T-Type GNX GM Original POWERMASTER BRAKE SWITCH #7175