Sorry for the dumb question, but....

I need to know which direction the brake booster check valve does. there's a litte arrow on the valve, but i still dont know for sure. if you blow into the valve...it obviously goes only one way. can't blow one direction and can easily blow/flow in the other.

so which direction does the valve flow... air going "TO" engine or air going "AWAY" from the engine.

Thanks a mil

Cancel this... i did a search and found the answer. i should have done this first. sorry.

And for any one else......

Suck on the valve, if you can suck air, the end that's in your mouth, goes toward the engine.

This stops any air from going toward the booster, in case of a backfire, to keep the diaphram of the booster from being damaged.