69-chvl

iTrader: (11)

What happens with these things under boost? I think the brake booster has a check valve, but not sure its strong enough to resist boost. What about the trans modulator?

dschmittie1

iTrader: (64)

Your brake booster should have a check valve in it so that it only sees vaccum. Not sure about a trans modulator. It Should at least be able to see atmospheric pressure as that is how it is designed to work

griffsbombelco

iTrader: (2)

My brake booster worked fine only thing that sucks is staging the car as I loose vacuum and get into boost I start to loose some breaking power. I also have a th400 that uses only vac and would not shift under boost a tbrake manual valve body fixed that but I'm sure you can find a check ball

PUNISHER TA

iTrader: (13)

I have no idea what happened with my car. nor do I really understand how a vacuum boost works, but I can tell you.

When I would take my car out for hard pulls.. The booster would get filled with boost and GET STUCK. Driving home from work a couple times, the brakes would just lock up, I had to pull over and unplug the booster line.

Never figured it out. Going to manual brakes.

RonSSNova

iTrader: (3)

Same question about the vac modulator. I'll pink jake shoe an see what he says. You might just post this in the trans section as well.
I have manual brakes.
Ron

SPRAYED 01

iTrader: (22)

I ran a one way valve when i had a modulator. Never messed with the boost, always works fine

69-chvl

iTrader: (11)

I did search, and interestingly one solution for the modulator is to install a T inline with a check valve, then the boost is vented out. Yes, a boost leak but evidently its such a small amount that it doesn't really matter.