Brake pedal goes to the floor and the truck barely stops

1977 FORD F-150
79,000 MILES • 6 CYL • 2WD • MANUAL
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DAN BRADFORD
  • MEMBER
  • 1 POST
The truck has been sitting for a while. When I press the brake pedal it goes to the floor and stays there and it barely stops the truck. I checked the brake fluid and it is full so I am assuming it is the master cylinder or booster, but I am not sure which to check first.
Jan 25, 2017 at 3:46 AM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,413 POSTS
The power booster only makes the brake pedal easier to press. It has nothing to do with how far it moves.

If the brake pedal was pressed further than half way to the floor, it most likely has been damaged. Bench-bleed the replacement, then I can share a trick to prevent having to bleed at the wheels.
Jan 25, 2017 at 3:53 AM
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