brake issue:spongy when engine is running good when not all new parts any idea on 1996 Dodge Ram 2500

bled according to book, master, then RR, LR, RF, LF,

by in Sunbury, OH on January 22, 2013
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2 answers 11 comments
ANSWER by , January 22, 2013
poss bad master cyl?
COMMENT by , January 22, 2013
replaced master cylinder, bled many times
COMMENT by , January 22, 2013
did you buy r/b mastercyl or new?
COMMENT by , January 22, 2013
COMMENT by , January 22, 2013
maybe thats your problem.
ANSWER by , January 23, 2013
With the engine off ,does the brake pedal pump up and get 'solid'?
COMMENT by , January 23, 2013
yes, it does
COMMENT by , January 23, 2013
Next , when driving it , does it have good response to the touch and does the ABS work as designed?
COMMENT by , January 23, 2013
very little pedal when driving, brake and ABS light are always on, only about 1 inch left to floor when brake is on
COMMENT by , January 24, 2013
As globalhelper already mentioned then , possibly a faulty re-man. M/C. Disconnect the lines and plug the ports at the M/C (possibly came with plugs threaded into it for shipping)bleed M/C again and check pedal with engine off and then running. If the pedal stays solid while running this time , then you've either still got air in the lines elsewhere , or another part is the cause. If the master cylinder does not hold pressure , then exchange and bench bleed the next one before installing.
COMMENT by , January 25, 2013
okay, here's where we are. Mechanic bled brakes, says master is fine. Good hard pedal w/engine off. Goes to 1 1/2 inches from bottom when running, good brakes at that point! the mystery continues...
COMMENT by , January 25, 2013
Drum brakes in back? If parking brake lever (inside drum) is not in the fully released position and the shoes are not adjusted properly(must pull drums to inspect both sides) , that may cause excessive travel in the wheel cylinder also leading to your symptom.IF parking brake PEDAL is 'self adjusting' there may be a special method to release it(which I don't know , or I'd tell you).ONE other thought (don't laugh)........The pedal heights aren't the adjustable kind , are they??I had that in an Odyssey not long ago, the owner had unknowingly pushed on the adjuster button and lower the pedals to the lowest setting and then brought it in to us all freaked out. -------Don't think that's the case with yours , just had to mention it.either way , please reply with the fix , now I'm really curious!
COMMENT by , February 21, 2013
I agree with ziptie