I am having no luck getting brake fluid to my rear drum brakes. I have pressure coming out the MC to the combination valve. Fluid goes thru to the front brakes, but the port going to the rears has nothing coming out. Any Ideas? 95 ECLB 2500 4WD Thanks

 

Have you checked to make sure the proportioning valve above the rear axle is not shutting off the flow?

 

I have the fitting off of the combination valve where the rear brake line exits and nothing comes out when we work the brakes. The front brake are fine, nothing to the rears. Thanks for replying.

 

Then I'd start working backwards until you get to the master cylinder, looking for the restriction/blockage.

 

Is the brake light on?

Plunger at the combination valve could be stuck in the rearward position.

 

replace the MC