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Old 01-09-2009, 03:55 AM   #1
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Default vacuum problem? bad brake booster?

alright, i know you guys will do your best. here goes lol

when i first got my HB i had to change the passenger rear wheel cylinder, so naturally, i had to bleed the brakes. while i was pumping the brake pedal with the engine running, every time i pushed down the pedal the engine would bog a bit, like it was going to stall. but it when i let off, or held the pedal down, it would stop bogging and run fine. and about 2-3 weeks ago, i started running into a problem where i would have to put the pedal pretty much to the floor before the brakes would start to grab.

now, my guess is a vacuum leak somewhere. bad line, bad line connection, or maybe a cracked booster diaphram?

being that it is my braking system, it is quite urgent
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Old 01-09-2009, 04:47 AM   #2
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if the booster were bad you would have a stiff pedal. main causes of pedal fade is missadjusted brakes. may also have a leak somewhere in the system. or an exturnal master cylinder leak. also only changing 1 wheel cylinder could cause a problem.
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Old 01-09-2009, 04:59 AM   #3
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well, i drove it for about 3 monts after i changed it with no problems. i just re-did the brakes the other day and re-adjusted them and still no change. theres no fluid leak anywhere, the level of fluid in the reservoir hasn't changed.
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Old 01-09-2009, 11:20 PM   #4
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anyone else know what it could be?
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Old 01-10-2009, 04:19 AM   #5
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may also have a bad residual(sp?) pressure check valve. i'm assumming that you bled the brakes, on the first drum when you first opened the bleeder screw did fluid "shoot" out?
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Old 01-10-2009, 08:53 PM   #6
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yea, i know how to bleed brakes, i did the bleeding process until there was no air coming out, only straight fluid.
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Old 01-11-2009, 02:10 AM   #7
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I've got a similar problem with mine.
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Old 01-11-2009, 10:13 PM   #8
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anyone else have an idea?
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Old 01-15-2009, 01:00 AM   #9
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??????
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Old 01-15-2009, 01:08 AM   #10
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Your new cylinder could be bad. Or there is still air in your lines. Hardbodies are one of the hardest brake systems to bleed. all of the proportioning valves and cooling loops make for great places for air bubbles to hide. You may want to rebleed them agian to double check for air in the lines. Last time I unhooked my rear brakes to do some work on my axle I had to bleed them three times before they were good. !st time and drove 500 miles then lost brakes rebleed drove some more then rebleed now seem fine. Hope this helps.
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