Brake pedal goes to the floor

Tiny
EMMI EVANS
  • MEMBER
  • 1994 CHEVROLET CAVALIER
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Brake pedal goes to floor, loss of brake fluid and cannot find any leak on master cylinder or on ground.
Friday, January 19th, 2018 AT 3:19 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,741 POSTS
When there is no external leak and the fluid level is dropping, the best suspect is the secondary seal at the rear of the master cylinder. Unbolt the master cylinder from the power booster and pull it forward, then check to see if that area is wet and brake fluid is going into the booster. You also might find wetness inside the large vacuum hose going to the power booster.
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Friday, January 19th, 2018 AT 4:21 PM

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