I have a '91 Chevy Suburban, 5.7L 1500, 2 wheel drive, AC, PW.
One day my power brake went out abruptly. One second I had power brakes, the next they were gone. I can still brake, but the pedal is extremely hard to depress.
I checked to see if I had vacuum, and I get strong suction from the line that goes directly into the booster. Has my booster gone bad, or is this possibly a master cylinder problem?
Thanks in advance for any assistance!
Mark