quote:

Originally posted by Patch1st:
This is a pic of the "air regulator" there are three lines; 1:From compressor, 2: From Master Cylinder, 3: From the brake treadle (pedal)..

This is actually a Bendix R-14 Horizontal Relay Valve - Service Relay Application Valve.

The top left airline gets a signal from the brake pedal - the lower right hose is the air feed to the valve, whatever you see on the airguage is what is in this line on the right.

Once the signal line senses air psi - it opens up a valve and sends a variable amount of air psi from the right line to the middle line to apply the rotochamber.

Signal: Upper Left - Small Red Line
Tank Psi: Right Side - Large Black Hose
Application PSI: Lower Middle - Large Red Line

Thank you for the clarification..... I was truly hoping that valve was what had failed, but Murphy got me again....The front brakes were dragging very hard (nearly locked) so when I removed the red line it should of at least hissed, nuthing...
Then when I opened the drivers side bleeder (with the red line still dissconnected) the passenger side tire (which was off the ground and locked) spun freely....I surely hope I have corrected the problem, I'll know after it is bled... Could that have caused the pedal to require extra pressure? It has always seemed that the pedal was hard to push/hold, my leg would get tired at a stop light...

quote:

Originally posted by Patch1st:
...so when I removed the red line it should of at least hissed, nuthing...

You are referring to the larger red lower right airline right?

Yes... And that is where I installed the $1.49 plastic plug so I could drive it home on the rears...

We are looking forward to see you again in FL, hoping you make it. Tell Cloudy Hello from Doris and hope your Turkey does not have a funny paint flavor

I have had these airvalve retain air on release. Not that it would leak, but after application, not all of the air psi vents back through the valve and this still applies the brake chamber.

Now, if you tell me you took this airline off and it was still applied, then yes, it is the rotochamber/master cylinder assy.

If it does it again, remove the other pipe plug to the left of it. Install an air psi gauge and read the air psi after application and release to see if the air is fully venting.

Also, these valves could work fine at full application and release, but if you slightly apply the brakes, like if you were slowing down, then the valve might not vent out the air because it doesn't get the rush to force it back off of its seat.