Rear Brake problems 1990 6.2 Diesel

[Mike Hill]

Recently I replaced the Steering box in my Suburban.It was leaking and I experianced a sudden loss of braking power.I replaced the Steering box and bleed the pump.

Today I drained the brake system and with a freind helping started to bleed the brakes.The Front Brakes have blead fine,pedle stiffens and lowered when the brake bleed valve was opened.

However there is little or no Fluid coming out of the rear bleed valve.We try and try,pumping the pedal numerous times,with engine running and with engine off to see if that made a difference.

Still nothing comes out.

Any help much appreciated.

Mike

[Joeairforce]

Sounds like the bleeders might be clogged up. Try taking them completely out and see if you can get fluid to come out. If so, you just need to go buy some new bleeder screws.

[tbplus10]

You should always bleed the rear brake bypass valve first if your vehicle is equiped with one, then bleed the brake actuator farthest from the master cylinder, usually the right rear.
Also never drain the brake system of all fluid, the proper method is again to bleed all the old fluid through the farthest out brake actuator, then when you have fresh clean fluid through the system proceed to the next closest wheel until it has clean fluid and so on until all actuators have been bled.
Draining al the fluid allows for a chance of contamination into the system no matter how careful you are. Additionally draining the system can also cause the master cylinder to need to be bench bled before servicing the system.
Check for the bypass valve and check to ensure the rear section of the master cylinder is actually pumping.