Back brakes no fluid getting to them!

[Windowtwkr]

1985 wagon, not getting fluid to back brakes, replaced master cylinder. Still no back brakes, front brakes work perfectly. Could the proportioning valve be clogged? I'm baffled.
Thank you

[helipilot77]

Yeah it's almost certainly the portioning valve. I have pulled them apart before to find them so clogged you would think someone had stuffed it full off clay. Often a good cleaning and a seal kit is all it needs.

[Windowtwkr]

Cool, that's was my thought.Thanks brother tercel man!
New comic book hero TERCEL MAN

[Windowtwkr]

Where would I get a seal kit, just o rings?

[teranfirbt]

Could also be the rubber hoses above the axle. Had a friend who had those hoses break off a little flapper inside, acted like a check valve. Although to have both go at the same time would be super odd..

[Windowtwkr]

Checked line to hoses, no fluid. Thanks for the support

[marlinh]

Proportioning valves usually limit braking to one front wheel and the opposite rear wheel. It gets activated if you lose fluid in one side of the system. I have not seen one clog up.

Did you bench bleed the master when you put it in? Why did you replace the master cylinder?