New day, new problem. Having trouble bleeding my rear brakes on my 92 Ford Ranger. I had to replace my brake booster and master cylinder due to damages on both but now I'm having problems bleeding my rear brakes. The only fluid I got out was the very old brake fluid and but after all that was gone, no new fluid came through the lines. Might be the RABS but no light comes on the dash so I'm here asking for help

Additional Info
Fluid is coming out strong in the front.
Rear brakes are Drum Brakes.

 

is the peddle hard when you try and bleed them?

 

its firm when pressing down

 

I would follow that line back to the master cylinder or where it starts from and crack the line to see if it will flow when pressing down on the pedal.

 

remove the line directly from the master cylinder or from the next place after the master cylinder?

 

tighten the rear. then loosen the line the rear line at the master cylinder just enough so when you press on the pedal it will drip. you are trying to find where its blocked.

 

sorry im not familiar with that year. if the front lines are clear where are the rear being blocked? on the master cylinder is there one or two lines? front and rear? and from the master cylinder where does it go?

 

they arent blocked

 

2 lines, assuming rabs

 

ok so thats from the master cylinder ? do the lines from there go directly to the break cylinders? did you check both right and left rear wheels?

 

update turned on the truck and the brake pedal went all the way to the floor without resistance

 

There is a proportional valve along the drivers side frame , if the lines to the rear brakes fail
, or rust, the sudden loss of rear brake pressure triggers the valve to close. New ones are costly, however replumbing the rear brakes and adding a secondary proportional valve worked for me.