I have only had the YJ for a few weeks and was surprised at how bad the brakes were but a read of the web suggested they may be normal for a Jeep!
Yesterday however, I had the AC off and when I braked I could hear a hiss. Today I sucked on the brake booster suction pipe and my wife pressed the brake pedal. To start the booster held vacuum but as soon as the pedal was pressed the vacuum leaked away.
I presume this is not normal and I have a leaky brake booster?