1994 Ford E-350 Q&A
1994 Ford E-350 Question: Brake pedal goes to the floor slowly
I have isolated the front from the rear and determined the front is the cause to the pedal bleeding down. I bleed numerous times. Booster works perfectly, no air leaks. Only rear abs. I also replaced both calipers. To isolate the front, I disconnected the rear brake line from the master cylinder and plugged it. Pedal goes to the floor slowly. I disconnected both lines from master cylinder and plugged. The cylinder locks up, no movement. - AAAWoody
from your description, either you have air in the lines that is being stubborn, a leak in the front or a bad master cylinder. Roy - mastertech6371
Use brake line clamps to block off each front caliper at the brake flexible hoses just to eliminate the front calipers/caliper mounts being an issue. It is likely to be a bad brake master cylinder. - patrick mannion
I HAVE REPLACED THE MASTER CYLINDER TWICE (THOUGHT I MIGHT HAVE GOTTEN A DEFECTIVE ONE). I HAVE REPLACED THE ANTI LOCK VALVE, VACUME BOOSTER, VACUME PUMP, ANTI LOCK SWITCH BOTH FRONT CALIPERS AND P...