I have a '99 2500 2wd with a cummings just stock. I have replaced my rear drums becuase of the same issue. The rear brakes are working alot harder than the front. I've worked on alot of vehicles and did bleed and adjust a bunch!! It must be the master cylinder or?? I would appreciate any help or ideas. Thanks

 

Could be master cylinder. Could be proportioning valve. Could be hoses on front.

 

I just didn't want to start guessing and spend more money than I have to.

 

I believe that truck has a height sensing proportioning valve. Take a look at to see if the linkage has broken or come out of adjustment and the valve is pushed up like you have a heavy load in the bed.

 

I do not see anything like that. There are 2 diferent valve bodies. One looks like just a splitter and the other maybe an ABS valve body as it has a small box by it?

 

i had this same issue on a dakota and the fluid got contaminated and the hoses swelled on it. they worked fine for the first few pumps then were vary tight after that till it sat.

 

Mine are just tight all the time. Very touchy usually at low stop speed.