[klextra]

I'm a little new to this. I have a 67 Mustang coupe with factory power brakes. At least I think they are factory. Suddenly the power in the brakes stopped working requiring extensive force to stop/slow the car. Brakes fluid is full, brakes are bled. Pedal is not mushy at all, I just have to press hard. Any suggestions on what to do next? Thanks!!

 

[rex1965]

Assuming you don't have a vacuum leak, check the one-way check valve plugged into the vacuum brake booster, sometimes when the engine backfires it blows it up, it could be stuck or plugged, and the other possibility is a leaky diaphragm in the power brake booster. Post your results. Good Luck.