Blown 96 WS-6

I was at Willow Springs this weekend and ran into some brake trouble. Last session of the day I was coming into turn 5 and my brake peddle would not depress. I managed to scrub off enough speed to get though the turn and around and off the track but it wasn't easy.

Anyway, I am suspecting the brake booster. The car is FI and normally runs about 17" of vacuum at idle. It is currently running only 11". Normally I would think that's enough to activate the booster. Yes or No?

I pulled the check valve out of the booster and it seems to be operating properly ... I can blow through in one direction but not the other. But plugging the hose from the intake to the booster and idleing still only gets me 11" of vacuum. My thought being that if I had a torn diaphram in the booster, i should see my normal vacuum with the line plugged. Yes or No? But, again, I would think that 11" of vacum would be enough to activate the booster?

I may have 2 coincidental issues but I was hoping to get wisdom from you guys before I start ordering parts to throw at it.

respectirocz

you are right, if there was a leak in the diaphram and you plugged the line, that would eliminate your vacuum leak returning your vacuum at idle to normal

i am not sure how much vacuum is required for booster operation so i cant answer that question, but you should definately find out whats causing 11 " of vacuum at idle

Blown 96 WS-6

I agree ... I need to chase down the cause of the vacuum drop off before I can make any decision on the booster. Weird that they would both develope at the same time if they're not related