I hate changing old crusty parts

[bevans6]

because they always break!  there I was, happily changing my driver's side DD3 chamber and I go to undo the locking port line from the inversion valve and "Dang, that's tight" was the last thing I thought before I snapped the fitting off of the valve.  So I decide to take the valve off and fix it.  so I immediately snap the pressure in fitting on the top of the valve.  What is it with snapping fittings all of a sudden.  so I go to undo the big nut on top of the inversion  valve since I can still fix this if I can get it to my bench.  Said big nut will not budge.  To the extent of bending the mount.  so I decide that I ain't gonna fix this valve  and proceed to cut the nut off with an angle grinder.  I hate old corroded brass and aluminium crap.  I just hate it with a passion.

So, good news is I get to replace all the fittings and the inversion valve and the two way check valve for good measure, and all the hoses too ( they are those totally stupid hoses with pipe thread fixed non-swivel hose ends that I was whinging about a day or two ago).  That will be nice, but i really needed to move my bus to a new parking spot this weekend.

So my question.  Is there any chance a normal modern truck store will have this inversion valve, or is it a specialty only for old buses item?

Brian

[luvrbus]

Truck supply should have it what is the the number a TR2 or what

good luck

[bevans6]

I only have a MCI number, unfortunately.  Edit:  Yes, it's a Bendix TR-2 valve, thank you very much.  

I got mad at it, so I put it in the vise and took the top off.  Just squeezing it in the vise made me feel better    One of the broken fittings was in the top cap, the 1/4 pipe hole in the cap.  so I took the top off, drilled it out successively until I could just see the threads, used a scribe to tap out the remaining brass, chased the hole with a pipe tap and it looked pretty good.  So I took the bottom off, found the cap under my bench where the two springs had flung it, pulled the piston out, it all looked OK.  So I repeated the drill, hit, chase procedure on the hole in the side of the valve, cleaned all the debris out, and reassembled with new(er) fittings.  The thread for the big nut that mounts it is totally ruined, but that doesn't matter because I had to cut the nut into three pieces to get the thing off the bus, so I will tie-wrap it in place and all the hoses ( there are 7 hoses connected to the assembly) will hold it in place until I can get a new one.  I need to put it all back on so I can move my bus to a new parking spot tomorrow.  It will be all "dead throttle starts", since I haven't got my new throttle cable back yet...  I'll just idle it along, but I need brakes!

This is actually good, because I had thought that the inversion valve had been replaced in 2002 when the bus was imported to Canada and got a decent service.  I checked the invoice, and only the R8 valve had actually been replaced, and none of the hoses.  So I am well overdue to be servicing everything back there anyway, and a new inversion valve is gonna be in there soon!  And all new hoses!

Side benefit, ie, the silver lining...  I finally figured out how the inversion valve actually works, and what it does when to what.  

Brian

Brian