TROUBLESHOOT MASTER CYLINDER REPLACED

CHEVROLET BLAZER
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CASSANDRA GRICE
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  • 2 POSTS
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.
Aug 1, 2007 at 12:53 PM
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MHPAUTOS
  • ✓Experienced Mechanic
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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)
Aug 1, 2007 at 1:09 PM
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