Pete 389. Parking brake won't release, please help

Thank you. I probably should have done it on Saturday, right after broke down. Right now it is less than 24hours until mechanic comes back. Also, the problem is - I don't know which one is leaking, or if any of them is leaking. He said "chambers are fine". I will probably wait till morning, unless cop tells me to leave.

 

Hard to tell from where, space is very cramped, but a lot of air noise coming out of this valve assembly. Mechanic also said "this valve is the problem", replaced it. Problem was the same after replacement. Then he said "I am confused" ))

 

He first replaced that valve assembly located on the cross member, between axles. Then he ruled out brake chambers, listened to them if they leak air, also pinched air hoses on every brake chamber. Then he got inside the cab, noticed parking brake valve assembly making noice when Yellow knob pushed in, said "it's probably it, 99% sure". That was the end of his work, he said he'll get new valve assembly from a dealer on Tue morning, and will come back to install it. Hopefully he is right. But I doubt.

 

That's what I think too. But this mechanic guy got confused, and he confused me. Tomorrow he will replace push/pull valve assembly, then he will start looking at the chambers again. Just my guess.. And I already 3 days late to deliver my load that pays $10K. My $10K load will become $7K or so. This long weekend is s...t for me ))