Finally got to start putting my son's 68 cougar back together. We got the engine running and we can hear a vacuum leak coming from the power booster under the dash. When we slightly activate the brake pedal the leak seems to stop. When we put the booster together, I noticed there was a push rod that seemed to have an adjustment to it. I was wondering if the booster has a leak or I need to take it back off and extend the push rod. We have disc fronts and drum rears. I also tested the check valve on the booster. I can not blow air into it, but I can suck away with no resistance. Please respond.
Jeremy's Dad.
Jeremy's Dad.