Tk Bedford brake problem

Hi just wondering if anyone has a brake repair manual for tk Bedford 1972 edl has 214 Bedford engine. 6 ton air over hydraulic. I think I will need to rebuild the pump also. Cheers paul

What seems to be the problem with them. Dave

Hi dave pump is making pressure but rears seem to be on still. P

I would back them off completly and see if they release if they dont you could have a leaking air but does the buzzer come on when pump them .
Do you have to build up air when you start in the mornings if so you have a leaking air. Dave