Mechanics

HOW MUCH IS THE COST TO REPLACE THE POWER BRAKE BOOSTER?

1998 Mitsubishi Colt

My 1998 Mitsubishi Colt shuts off when I press the brakes. I think it's the power brake booster. How much would be the cost approximately to replace the power brake booster?

Thanks
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Nxmnxm
August 28, 2012.




Do u hear a hissing noise?I never heard this ever happening. Id look for a loose wire under the hood. That maybe moving back and forth when u are hitting the brakes. When u hit the brakes it moves and shorts the engine out.
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Cadieman
Aug 28, 2012.
Thank you cadieman. No hissing noise and when the car is stopped and idling there it does not shut off if you press the brakes. It's only when we are driving it and hit the brakes that it immediately shuts off. I thought it was the strangest thing also. I know a little about cars, and I have never seen this problem. Someone said the power brake booster. I also thought it was electrical, but everyone keeps saying the power brake booster. What do you think?

Tiny
Nxmnxm
Aug 28, 2012.
Seems the idling speed is not stable causing the problem and definitely don't seem to be the brake booster.

Is the MIL indicating and have you checked for trouble codes?

KHLow2008
Aug 28, 2012.
Thanks KHL0w2008. Negative to both the MIL and I have not checked the codes. I am in Warszawa, Poland right now and it's actually my girlfriends car. But she is really sad and I want to help her out. I will have to hook up the computer to check for the codes I guess. I would think it's an idling speed problem also, but it does not shut off when you are stopped or driving. The idle is perfect. It's only when your driving and press the brake, it automatically shuts off. Everyone keeps telling me the brake booster diagphram and the vacuem is sucking to much air and messing up the air/fuel ratio causing it to stall out. Initially I thought it was an electrical problem.

Tiny
Nxmnxm
Aug 28, 2012.
If the booster was bad u would have a hard brake pedal. Make sure the wiring is good at the battery and its not moving around. Ck all the wires look for any thing shorting out. Leave it running and move all the wiring around. When the engine stalls inspect that harness. If still no we will have to move inside. We should be able to find it.

Cadieman
Aug 28, 2012.
You know, my girlfriend told me that the whole problem started when she tried to hit the alarm button and open the door. She said it wouldn't open and when it finally did, the radio than wouldn't go on and than this whole thing with it shutting off when she pressed the brake started. I thought maybe the stoplight switch was causing a short, but the brake lights work fine and I checked the battery and its fine. Than I figured its a short somewhere. All this initially led me to believe it's an electrical problem. But than of course everyone started with the brake booster. Im glad you are also thinking it's electrical. I keep thinking it's also electrical. I will do as you suggested and check the wiring.

Tiny
Nxmnxm
Aug 28, 2012.
When vehicle is stationary, does depressing the brake pedal cause the engine to stall or become erratic?

Does it occur only with hard braking?

KHLow2008
Aug 31, 2012.
Thanks for the reply KHLlow2008. No, I checked this also and when the car is stationary and you press the break, nothing happens. It does not shut off or the engine become erratic. It is only with hard braking when we are moving. And the last two days, I tested the car and everything is fine and back to normal. But I don't trust it.

Tiny
Nxmnxm
Aug 31, 2012.
U may have moved the wire that was shorting the system out. We will be here if you need us. Gl

Cadieman
Aug 31, 2012.
Possibly something is loose somewhere and the hard braking is swaying it to cause the engine to stall.

Maybe you should try checking for trouble codes. Some trouble codes do not trigger the MIL and in your case, even if the trouble code is triggerred, you might not notice it because the engine has stalled. Since it is an intermittent problem, restarting would not have the MIL indicating.

KHLow2008
Aug 31, 2012.

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