brakes
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brakes
i have a ford ranger with abs. it sat over the winter and at start up i found a rusted out rear brake line and bad m.c. i replaced both as well as new pads etc. and rotors. now the problem. i have good flow to all wheels when bleeding and no air and have good pedal , but as soon as the engine is started the pedal goes to the floor i tried bleeding with the engine running and did manage to get pedal but as soon as i moved the truck it was gone.i have bled the m.c. aqnd no air there. i removed the abs fuse and no change. the only way i keep pedal is to disconnect the vacumn to the boosterwhich makes no sense. i took both lines off the m.c. and plugged them and found some pedal fade but not alot. i then plugged one port of the m.c. and ran the other into the resevoir and had padal. i then reversed it with the other port and no pedal. i am stumped HELP sam
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i bled the m.c. on the bench before i installed itand have since disconnected the lines to the m.c. and routed them back to tthe resevoir and rebled it again while on the truck and no sign of air sam
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From: B'more
According to my manual, ABS brakes require a 'special' bleeding procedure. You need some sort of adaptor and jumper to turn on the pump motor in the hydraulic control unit to purge the air from the unit. The adaptor has a button that activates the pump.
http://www1.autozone.com/servlet/UiB...3d800aa5f0.jsp
http://www1.autozone.com/servlet/UiB...3d800aa5f0.jsp
Last edited by agryphon; Nov 3, 2006 at 01:58 PM.
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i can buy that and have given it considerable thought. what i don,t understand is first why i can have pedal with the engine not running, have pressure with the key on ,have pedal with the engine running with the vacumn hose unhooked whether or not the abs is plugged in .it seems to revolve around the vacumn hoseand the3 only thing that makes any sense at all is that with the hose hooked up the increased pressure causes the m.c. to bypass on one of the systems. i have been at this so long now that i think the answer is right in front of me . but i can,t see it. i have read that to test a m.c. that you plug both porst and apply pressure but if only one piston is bypassing i would think that you would still maintain some pressure sam
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