dangerous acceleration when brake applied
Thread Starter
Cruising
Joined: Dec 2007
Posts: 10
Likes: 0
dangerous acceleration when brake applied
Can anyone help me with this: I have a 92 and ever since I got it in august, I have dealt with a problem that sometimes happens when I break to a stop in that the engine RPM increases and the engine fights the break. I end up crushing the break pedal or flipping the trans into neutral. A friend advised it may be a vaccum problem but we checked and could find no leaks. The problem is dangerous, I almost ran over some kids after I first bought the car.
Intermediate
Joined: May 2006
Posts: 49
Likes: 0
From: San Jose California
i have a 67 camaro as well as a 89 vette. When i first got my camaro it would do that. What had happened was that one of the engine mounts had broken and when i was stopped it would move the engine forward enough to pull open the throttle body. You should check to see if your engine mounts are in good condition. Im guessing your vette is an automatic, correct?
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Cracked brake booster. When you apply the brake it applies pressure to the brake booster which is opening up a crack in the booster (common on these car). Bet if you do a vacuum test on the booster it doesn't hold. When the crack opens up you get a shot of air into the motor.
Burning Brakes
Joined: Oct 2006
Posts: 834
Likes: 0
Cracked brake booster. When you apply the brake it applies pressure to the brake booster which is opening up a crack in the booster (common on these car). Bet if you do a vacuum test on the booster it doesn't hold. When the crack opens up you get a shot of air into the motor.
sounds alot like what happend to mine when I cracked the booster housing while working on it in the winter. Except I have a manual so I didn't have the problem of the car fighing the stop but the engine RPM did increase under breaking.
Thread Starter
Cruising
Joined: Dec 2007
Posts: 10
Likes: 0
thanks
yes it is automatic, thanks for the suggestion
i have a 67 camaro as well as a 89 vette. When i first got my camaro it would do that. What had happened was that one of the engine mounts had broken and when i was stopped it would move the engine forward enough to pull open the throttle body. You should check to see if your engine mounts are in good condition. Im guessing your vette is an automatic, correct?
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Thread Starter
Cruising
Joined: Dec 2007
Posts: 10
Likes: 0
Thanks
Thank you, I will have the vacuum tested!
Cracked brake booster. When you apply the brake it applies pressure to the brake booster which is opening up a crack in the booster (common on these car). Bet if you do a vacuum test on the booster it doesn't hold. When the crack opens up you get a shot of air into the motor.
Thread Starter
Cruising
Joined: Dec 2007
Posts: 10
Likes: 0
