Can’t get rear brakes to bleed any fluid

2006 base 4x4. Went to bleed because brakes were soft and barely any fluid came out the rear brakes. Bleeder valves are clear and there’s fresh fluid in the master cylinder. Can’t seem to figure out why no fluid is coming out even with the bleeder screw fully out nothing comes.

 

Get a helper, have them push the brake, hold their foot down, close the bleeder screw. Have helper lift their foot, open the bleeders crews, if no fluid comes out, repeat the process, until it does.

 

How long should this take because i did it for like 30 minutes and nothing came out.

 

Is the parking brake disengaged? Are both sides doing this or just one side?

 

Did you consider pulling the line right off the wheel cylinder completely and seeing if anything comes out THEN?

 

Perportioning valve.

 

I’ve read that there is no stand alone proportioning valve and that it’s just part of the ABS module

 

the parking brake was on and both sides have no flow

 

Did you use a pressure bleeder like one is supposed to

 

I tried to but even when using it barley any fluid came out

 

Are you 100% sure the bleeders are clear? I remove them and use a tiny drill bit to clean out the side port

 

yea it’s 100% clear i blasted air through and used a pick

 

To be clear, is someone pressing on the brake pedal, when you open them?

 

yea

 

Pinched or clogged line upstream.

Crack loose nearest line (usually pass side) from wheel cylinder and give a press on the pedal and see if fluid comes out.

 

If both sides are affected then a single kinked line somewhere isn't likely. Think of where both halves of the hydraulic system come together. Like the abs unit. Maybe it has a blocked valve inside or something.

Start working backwards up to the front of the truck, loosening brake line fittings until you get some flow. Everything probably goes to the abs unit on the passenger fender. And then over the firewall to the master cylinder