mig82rx7

iTrader: (2)

i just finished turbo charging and i need some help when i give it full throttle the boost gauge just reads vacum from 20 to 0 but no boost so me and a friend plugged the line to the break booster and then we got boost so he tells me to put a check valve to the break booster what do you guys think is there any other way i could fix this cuz i dont know what a check valve is or what it looks like thanks

REVHED

Some more information might help. What engine? Where did you take the vacuum source from?

bad 83

iTrader: (3)

Some of the SA's had a one way check valve close to the brake booster. This will work fine for you. This valve has held upwards of 12-15 pounds boost for me.

bad 83

iTrader: (3)

I tried to find a closer pic, but if you look in the lower right hand corner of the photo, you will see a little silver check valve in the rubber line coming off the hard line to the booster. This is where you will need it.

mig82rx7

iTrader: (2)

ok so i do need one check valve thanks for the info

steve84GS TII

Every car made should already have a check valve to keep vacuum in the booster after the engine is shut off or stalls.
This allows assisted braking several times after the engine shuts off.It also prevents intake backfires from hurting the booster,and on forced induction engines,keeps intake pressure from entering.It also keeps the vacuum in the booster at a preset level,since even N/A engine's manifold pressure fluctuates a great deal.It should be no different after going turbo,I had no issues and changed nothing on my car after doing my TII swaps.

mig82rx7

iTrader: (2)

hey steve84 your saying that i dont need one its safe to run it just like that the booster has a valve built in and could handle the boost?

steve84GS TII

The brake booster should never see positive manifold pressure because there should already be a one-way valve in the external hose leading from the engine to the booster.

That valve is included in all cars (N/A or turbo), for the previously mentioned reasons.It will also prevent boost from entering the vacuum booster since its a one-way valve.I still,and always have, run the factory valve in my car.

mig82rx7

iTrader: (2)

thanks