Brake booster issue/leak

[crx7]

So this started on Pearl Pass this summer, and I'm just noticing it more and more.

When the engine is cold and I start it and I'm idling, if I step on the brake pedal I hear and air leak from the area of the brake booster.

I cannot hear it while driving. Is this normal?

Thanks

 

[jonheld]

Is this normal?

Absolutely not.

 

[bwesty]

Did you check the hoses and valve attached to the booster?
Is it an aftermarket booster?

 

[crx7]

No, but that’s a good idea. Stock OEM booster

 

[davidp14]

Replace the check valve 1st. Its cheap and easy. Nothing else about the booster is either of those.

 

[alia176]

check to see if the check valve in front of the booster is actually working by sucking and blowing through it.

 

[ajax1]

Was a check valve on brake booster when my runner had that issue, would show itself when it was cold

 

[turbodizzle]

I had the same issue you described. I replaced the booster and the hissing sound has stopped. Go the part from here.

80 Series, NEW OEM Seiken Brake Booster and OEM Gaskets (2), 44610-60792

How to replace booster video here.