by matthewh » Mon Mar 17, 2014 4:13 pm
You can test everything, but my moneys on booster. My '93 did that, abs/brake light on, sporadic hard pedal. Ended up the booster was leaking into the cab. I did replace the pump too, as it was putting out the bare minimum at the test port, and the hose was good
'93 W350 5spd Getrag, 4.10 gears, 83k miles and counting, Mods: LPPP AKA Ma Dually
'54 Dodge M37 6.2/700R4/205, 5.89 gears, WC rear axle