BRAKE LOCK UP

1989 MAZDA MPV
1,000,000 MILES • 6 CYL • 2WD • AUTOMATIC
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R OGLE
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  • 3 POSTS
BRAKE HAS FULL PEDDLE
Mar 2, 2011 at 1:09 AM
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R OGLE
  • MEMBER
  • 3 POSTS
ALL FOUR WHEELS ARE AS IF BRAKES PEDDLE IS PUSHED.BY REMOVING VACUUM HOSE BRAKES ARE RELEASED.HAVE INSTALLED REMAN BOOSTER,NEW MASTER CLY
Mar 2, 2011 at 1:23 AM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Is the brake pedal to booster pushrod adjustment correct? If there is no clearance, the master cylinder would be partially activated and when heating occurs to the brake fluid in the brake system, the wheels would lock.
Mar 2, 2011 at 8:12 PM
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R OGLE
  • MEMBER
  • 3 POSTS
WHAT IS THE CORRECT CLEARANCE FOR PUSH ROD ???
Mar 2, 2011 at 10:35 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic

PEDAL FREE PLAY

Depress pedal a few times to eliminate vacuum.
Pedal free play should be .16-.28" (4-7 mm).
Adjust play by loosening push rod lock nut.
Turn push rod until correct free play is obtained.
Tighten push rod lock nut.

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Mar 3, 2011 at 10:17 PM
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