Press on break it idles higher

Asked by Guru6RJYP Apr 01, 2020 at 09:44 AM about the 1993 Chevrolet S-10

Question type: Maintenance & Repair

Hitting Break cause it to idle high volume and
vacum hoes off makes it idle even higher.
And has a miss when driving part of that plug
wires husband seen Sparks comming from
wires. Can we just blead brakes and do it for
top where the fluid goes some you can I
know

2 Answers
38,895

beatupchevy answered 4 years ago

Probably a leak in the brake booster vacuum lines , get new plug wires and route them away from grounds and each other , I've seen cars come back from a mechanic with the a new plug wire sitting on the exhaust manifold , lot of clowns out there be careful

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2,220

RickMN answered 4 years ago

If your idle speed goes up when you apply the brakes, you have a vacuum leak in the brake booster assembly. Also, it's not uncommon for idle speed to go up when you remove a vacuum line while the engine is running. Bleeding the brakes won't help at all with your current problem because it's not the cause. The cause is a vacuum leak. See this post on causes of high idle: https://ricksfreeautorepairadvice.com/high-idle-rough-idle/

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