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does anyone have an NSN or aftermarket part # for this?

thanks!

trucks been working great. now have a air leak from a valve above the rear axle?? bleeds out over night now. was wondering what it is anda part # if it needs to be replaced?

Found the problem..you were right again.. i had a misaligned service brake diaphragm on the rear axle. Truck is fixed and took it for a test drive. thank you and all that helped. i learned a lot.

ok - here is a pick of the rear axlw valve. been paint and cant read EXH - which of the lines is the exhaust?

forgot to mention...now the abs light is staying on as well?

OK. some progress. i replace the new bad treadle valve with a new one and it stopped the venting of air to the stack from the cotton covered line. truck came up to pressure and releace the spring brakes. i did have a small leak from a misaligned spring brake diaphragm but got leak to stop...

i'll get another one and give it a try.

when i turn the supply valve on i do still have air escaping fronm the cotton hose coming from the treadle valve going to the stack.... if i step on the brake pedal it seems to stop. the treadle valve pic shows which port its coming from. thats what is confusing me ... i would have hoped the...

these are the pics that trace the red line to one of the two tanks under pass side door

i will get a pic of that. I replaced the two valves on the top of the tank because they were leaking - tried replacing the o ring but were still leaking... everthing else is on the truck is the way i got it from the auction. Ive had the truck for about 5 yeras and everything worked fine till...

I had them off when i was trying to fill the wet tank.

In adition, if im stepping on the brake as truck is trying airing up i dont get the rush of air to the stack from the one cotton line in my pic.

I replace the treadle valve with a new aftermarket one. aired the truck up from shop hose... secondary gauge read 120 psi. primary read 0 psi. opened valve on the wet tank and still have air venting into line heading to air stack. now when wet tank fill i cant get over 70 psi on...

i will give it a try ..thanks everyone for the help!

thanks for the help - i will order a new treadle valve next month.

traced the cotton jacket hose back to the pedal...see pic.. upper right hose fitting...does this show the treadle valve is bad

I checked them all one at a time. no air. i then went to the three lines going into the stack. it was the large fuzzy line on the right it heads to the engine area..??

I aired up the truck and both the wet tank and secondary tank charged with air. the primary tank guage onn the dash read 120 and no air was escaping from the stack. the secondary still read 0. i took a pic of the valve i thing you were describing on the drivers side frame. it does have a...