1989 Chevy Suburban no brake pressure

1989 CHEVROLET SUBURBAN
225,500 MILES • V8 • 4WD • AUTOMATIC
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GSZAM
  • MEMBER
  • 1 POST
i have replaced my master cylinder, bleed the brakes. i have brake pressure with the engine off. when i do turn the engine on the brake pedal goes to the floor!!!

Why dont i have brake pressure with the engine on???
May 3, 2009 at 2:41 PM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
try bleeding with engine running
May 4, 2009 at 6:57 AM
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