No rear brakes?

[dhumboldt12]

The other day, I blew out a brake line, put in a new line, and tried bleeding the brakes. I bled them many many times and no fluid comes out. We pump the brakes, then crack the bleeder. Is there a certain way to bleed them, or a bad master/ proportioning valve?

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[magimerlin]

Ince you blew a line Don't forget to push the button back in on the combo valve...

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[dhumboldt12]

The combo valve is the valve inside the engine bay by the master?

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[dhumboldt12]

What button do you mean? Behind the rubber cap?

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[Colonel Sanders]

Yes, there's little buttons under the rubber caps, if pressing them doesn't fix it just try stomping on the pedal to reset the valve

 

[east302]

The pin should extend when the brake pedal is pressed. Put something flat against the pin to keep it from extending while someone pushes the brakes.


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[Bob L]

Stomping the pedal will only work if you have brake pressure. When I did my rear lines I just left the bleeders open filled the master and gave the pedal a couple light slow pushes to get the fluid moving. Then just made sure the master didn't run dry and let the fluid drip till no air came out.

 

[Supercharged111]

What exactly does resetting the valve do?

 

[magimerlin]

The valve trips when there is s leak. If the rear springs a leak it will block off the rear so you still have brakes... if the front springs a leak it will cut off the front.

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[Vortec94]

The pin should extend when the brake pedal is pressed. Put something flat against the pin to keep it from extending while someone pushes the brakes.

I use a clamp to hold the pin in place. Usually works but after replacing my wheel cylinders, rubber hoses and MC (yes, i bench bled it) and bleeding the lines, i can get a firm pedal with the truck off but with it on i still get the brake light and the pedal goes very soft. It's really annoying.