Why does engine rev up and down when I step on brake?
My engine isn't missing at idle or acceleration. When I step on the brake it revs up and down as if it is going to stop, but it doesn't. I let off the brake it revs/runs fine...
Is this a good question?
24 Comments
anyone with an answer?
by Joe Henry
I have had this problem also.
by stoco
I have the same problem it's a leak in the break booster so when u hit the breaks it's letting extra air into the engine and therefore revving check for a suction,vacuum sound right behind the break pedal when braking it shouldn't be there. If this all matches replace your break booster
by Josh Wheeler
I have the same problem but I was also wondering if when it revs it wastes more gas, so I could replace asap. (It’s been using more gas than usual)
by Pablosoria
I am a mechanic and the most common problem to agree with the above comment it is a brake booster
by Christopher Tha King Hogan
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