Brake pedal is low sometimes and other times very hard to push down.

1992 CHEVROLET LUMINA
243,000 MILES
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PAMELAX0X
  • MEMBER
  • 6 POSTS
Sometimes when I apply the brakes the pedal goes down far but it stops, other times the pedal is very firm and does not stop, any help as to what needs to be done would be greatly appreciated.
Sep 13, 2011 at 11:27 AM
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CJ MEDEVAC
  • ✓Experienced Mechanic
  • 11,000 POSTS
IT'S POSSIBLE YOUR MASTER CYLINDER IS ALLOWING FLUID TO LEAK BY THE PISTON INTERNALLY....USUALLY MEANS REPLACING THE MASTER CYLINDER

SOMETIMES YOU CAN VERIFY THIS BY EZing THE PEDAL DOWN VS "PUNCHING IT FAST"

ANOTHER POSSIBILITY IS AIR IN THE BRAKE SYSTEM

HAVE YOU CHECKED YOUR BRAKE FLUID LEVEL?

THE MEDIC
Sep 13, 2011 at 11:51 AM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
check the vacuem at the booster.low vacuem causes a hard pedal.if you adjust the the rear drum brakes will raise the pedal.if it applys, you need to check your brake operation.all 4 tires should lock up.if the master cyl. was bad the petal would just go to the floor.
Sep 13, 2011 at 12:12 PM
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