Brake Booster

[jimbo01]

Just to add to the information regarding the ATE booster. Upon sending the part to Karps for repair it was found that there was no check valve in the booster. It world be a great idea to check this. Talking with Karps they could not believe the fitting had no check valve in it.

[cycleguy55]

Originally Posted by jimbo01

Just to add to the information regarding the ATE booster. Upon sending the part to Karps for repair it was found that there was no check valve in the booster. It world be a great idea to check this. Talking with Karps they could not believe the fitting had no check valve in it.

Are you running an external vacuum reservoir and, if so, is there a check valve located there? FWIW, that's how my West Coast Cobra is set up, though I'm going to be adding a 2nd check valve on the booster, based upon the edited information below.

Edit: I just discovered references that indicate there should be check valves in both the vacuum reservoir (if equipped) and the booster.

Today's Technician: Automotive Brake Systems
5th Edition, Shop Manual
By Cliff Owen
Page 128

Today's Technician: Automotive Brake Systems
6th Edition, Classroom Manual
By Ken Pickerill
Page 128

[spdbrake]

Originally Posted by jimbo01

Just to add to the information regarding the ATE booster. Upon sending the part to Karps for repair it was found that there was no check valve in the booster. It world be a great idea to check this. Talking with Karps they could not believe the fitting had no check valve in it.

Thanks for the heads up. Just found mine does not either, thus I'll loose any built up vacuum once I go to idle. Mine only pulls 9" at idle so insufficient for the booster to operate.

[jimbo01]

According to Jeff at Karps the vacuum necessary should be in the 15 to 18 inch range. The purpose for the check valve is to have brakes once the engine is shut down. The system on the Backdraft cars has the booster line connected to the intake and no check valve installed. I am considering installing an electric vacuum pump should the new intake I have installed does not give me proper vacuum.