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TROUBLESHOOT Master CYLINDER REPLACED

Tiny
CASSANDRA GRICE
  • MEMBER
  • CHEVROLET BLAZER
WHAT COULD BE WRONG IF AFTER THE MASTER CYLINDER HAS BEEN REPLACED AND THE PEDAL STILL GOES ALL THE WAY DOWN TO THE FLOOR, SERVICE ENGINE LIGHT IS ON AS WELL AS BRAKE LIGHT. COULD IT BEE VACUUM LINES NEED REPLACING?PLEASE HELP.
Wednesday, August 1st, 2007 AT 7:53 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

Did you bleed the master cyl on the bench before fitting? And then bleed all 4 wheels? To check booster operation when you have a good pedal pressure. Pump brakes till all vacuum is exhausted (Hard pedal) with foot on brake start engin and pedal should suck down a bit (not much) You may want to check the vacuum check valve for leakage.

Mark (mhpautos)
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Wednesday, August 1st, 2007 AT 8:09 PM

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