brake peddal goes to floor with no loss of fluid replaced master cyl. new rear shoes new pads new calipers new front brake hoses 96 dodge 3500 Dually

 

you bleed the system of air?

 

I prime my master cylinder before I install them...Sure sound like you have a very big air bubble...

 

I bench bledmaster cyl I have bled system with a vacum bleeder I had this problem before any brake work was done I have good brakes, good pedal but if Ihold my foot on the brake pedal it will slowly go down, feels like when a master cyl. is bypassing i have been working onthis for two months

 

sounds like the master cylinder has an internal leak

 

thundercraft I agree with internal leak I have put 4 rebuilt master cyl. @ 3 new ones on have removed rwal I am at a loss as what to do next thanks for any help

 

Could be hydroboost issue. Internal MC issue is common problem for complaint. JMHO

 

What a minute...My truck does the same thing when its not running...Start your truck and pump your brakes...see if your brakes are back up...Some how these dodge brake systems are weird...

 

I have full pedal without pumping but if I set at stop lite or just hold my foot on pedal it will slowly go to floor let off pedal and do the same thing again and never lose any fluid

 

so what was the out come?