engine stalls when brakes are applied - JeepForum.com
 
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post #1 of 7 Old 02-25-2004, 02:29 PM Thread Starter
dhammonds2369
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engine stalls when brakes are applied

the problem is liek what the subject says. first tho i just got a lose pedal. looked at the master cyl and it was low on fluid so i figured i had a leak and sucked some air into the lines. so we bleed the brakes. that got my pressure back but everytime i would hit the brakes the engine would drop in RPM until i let off of it. we firgured it was the master cyl that was having problems so we replaced that. bench bleed it and then bleed all the brakes (rear pass, read driver, front pass, front driver in that order). the problem went away and i had normal brakes again. well now the pedal is getting hard to press and the engine stalls when u press it. i removed the vaccum line off of the brake booster and plugged the line from the engine with a wrech and the booster line with my finger. we started it and when u press on the brake pedal you get little to no vaccum from the booster. do you think the booster needs to be replaced also? the booster had little rust shavings and traces of brake fluid around the plunger. i do need help ASAP tho i cant keep driving like this....plus we are supposed to have snow tonight and ppl here cant drive in snow so i can almost say i know ill need to slam on my brakes because of some idiot more than one......but i would be an idiot too if i slammed on the brakes. thanks

Dan

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post #2 of 7 Old 02-25-2004, 02:51 PM
LoOpY
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you got it pegged. 99% you have a hole in the vacuum diaphragm inside your brake booster.
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post #3 of 7 Old 02-25-2004, 03:09 PM Thread Starter
dhammonds2369
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ok so replacing the brake booster should fix the problem right? i have on on order and will be here tomorrow morning.
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post #4 of 7 Old 02-26-2004, 05:09 AM
BamaJeeper
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The booster is shot. Get a new MC while your at it since the two go bad at about the same time.

Out of the darkness comes light.
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post #5 of 7 Old 02-26-2004, 08:55 AM Thread Starter
dhammonds2369
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yea its got a enw master cyl on right now...we were thinkin that it may have been part of the problem so wed fix the cheapest first. the new booster is sittin at my house right now....goin on as soon as i get off work granted there isnt too much snow. but then again if there is than ill put it on so i cna go out and have some fun out in the snow the crazy thing it is cheaper to buy a booster/master cyl together than the booster only. $5 dollars cheaper but oh well. ill let yall know if that was the problem. thanks for all the help.
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post #6 of 7 Old 02-28-2004, 08:48 AM Thread Starter
dhammonds2369
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yup brake booster....thanks for all the help. runs fine now.....and now that i welded on the new exhaust last night it runs even better.
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post #7 of 7 Old 02-28-2004, 05:56 PM
LoOpY
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groovy, glad to hear we could help.
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