dmaxvaz

iTrader: (1)

Hey turbo guys, I was wondering what you guys do with boost entering the brake booster? Do I need to install a check valve in the tube from the intake to the booster? i have weird brakes now on my trailblazer ss since the built motor/turbo went in.

Twin turbo c5

I've never used anything on my turbo cars. My brakes have always worked fine with the stock check valve in the booster. Did you change the cam ? Maybe it's not making enough vacuum.

dmaxvaz

iTrader: (1)

it has a .605/.608 lift cam with 110 or 109 centerline, a cam that AES spec'd with my motor. it has brakes, then doesnt. its not constant.

Twin turbo c5

Do you have a vacuum gauge? How many inches of vacuum is that cam pulling.

dmaxvaz

iTrader: (1)

12-13 in/hg. sometimes 15 for a second

97WS6SCharged

iTrader: (1)

That should be enough vacuum for the power brakes to function. Have you tried bleeding the system?

dmaxvaz

iTrader: (1)

i never opened up the brake system, and was fine before the motor/turbo. the brake booster just does not recover fast enough after several brake applications.

1320king

iTrader: (4)

I always run a 1 way check valve on my setups. You might need a vaccum canister. I had to run one on my SBC that had a large cam and had the same issues. Pump it 2 or 3 times then it would drop almost to the floor with no pressure. I actualy still have that canister if you need one.