00ZNewb

iTrader: (2)

My power brakes are fading for a bit after a full throttle pull. Doesnt have to be a long one either, maybe 5 secs. It happened at the track couple weeks back and i almost ran off the pavement. Doesnt do it at all normal driving.
I know old school stuff lost vaccuum to the booster when you had a large cam, but mine is stock. Is my booster going bad?
Thanks

FiredUpZ28

Are you coasting or are you decelerating after WOT

00ZNewb

iTrader: (2)

This afternoon when i did it, i ran it up in first, shifted to 2, the squeezed it down to WOT then shifted to 4 or 5 probably just to get the rpm down without "jake braking it".

Italianjoe1

Probably a bad booster check valve. Take it off and see if you can blow through it both ways. It should be 100% solid one way, and open the other way. If you can push any air though it the wrong way, it's allowing you to lose vacuum out of the booster at WOT, which is what it sounds like is happening.

00ZNewb

iTrader: (2)

Thats the white plug going into the booster at the end of the vacuum hose?

RPM WS6

iTrader: (3)

I agree, this is where I would start checking as well.

And yes, the check valve is located where the vacuum line meets the booster.

2000PewterT/A

My money would be on the check valve, first place I would look

00ZNewb

iTrader: (2)

Thanks so much for the replies

00ZNewb

iTrader: (2)

Well i blew through my check valve, and it doesnt allow 1 bit of air through in one direction.
Even had a nice vacuum in the booster when i pulled it out. What else could it be?