milehigreg
Well-known member
Lost vacuum assist on my 89 coupe. Brakes are still functional but it takes a lot of leg power. As soon as I depress the brake pedal I can hear a noise (air). Easier to hear inside the car. From the engine bay I can hear it and it sounds like it's coming from inside the vacuum booster.
Check valve stuck closed?
Check valve stuck open?
Hole in diaphragm?
Check valve stuck closed?
Check valve stuck open?
Hole in diaphragm?