1993 Chevrolet Lumina Idle Stall Brake Booster Fix

1993 ALL OTHER MAKES ALL OTHER MODELS
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GRIMMY523
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  • 3 POSTS
While the brakeis depressed at idle speeds the car wants to stop and sometimes does also sometimes when you accelerate after a stop it boggs down. I have replaced the plugs and wires. The rpm gauge also fluctuates when at idle with the brake depressed.
Apr 16, 2006 at 11:37 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Simple, you have a bad brake booster that is leaking vacuum when you depress the pedal causing all sorts of wierd problems. Good Luck
Apr 16, 2006 at 11:41 AM
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GRIMMY523
  • MEMBER
  • 3 POSTS
How can it be a bad brake booster when the rpm fluctuates even when i n park.
Apr 17, 2006 at 10:09 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
A vacuum leak is a vacuum leak regardless. It is greater when you depress the brakes. In the past 40 odd years of garage ownership I have replaced hundreds of brake boosters. Good luck
Apr 17, 2006 at 10:36 AM
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Suggested Repair

Replace the brake booster. A booster that leaks vacuum when the pedal is pressed can cause idle stalling, bogging after a stop, and fluctuating RPM.

Conversation Summary

A 1993 Lumina stalls or wants to die at idle with the brake depressed, sometimes bogs when accelerating after a stop, and the RPM fluctuates. Plugs and wires were already replaced. The owner noted the RPM also fluctuates in park. The expert said a failing brake booster leaks vacuum, especially when the pedal is depressed, and recommended replacing the booster.

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