I have been googling all day long and haven't found anyone with a similar issue. This thing is leaking. Its on the rear passenger side of my truck tucked in above the leaf spring.

It causes the brakes to lose power after 10-15 seconds of use. Is it called a "load sensing proportioning valve?" What should I do? Bleed the brake lines and replace? I have worked on motorcycles before, so I am mildly mechanically inclined.

 

If it is leaking it needs to be replaced. I have never heard of being able to rebuild them.

If it is the valve itself and not one of the lines that cracked. as long as it leaks it is going to draw in air.

You have two choices replace it with a new factory one or put a manual valve on.

Lots of threads on doing that.

 

Its called a Load Sensing Proportioning Valve, or LSPV

I believe its possible to get them new, though used may be a cheaper solution.

 

Thanks guys, I'll post pictures of my progress. I want to do all the work by myself, if I can.