I'm helping a friend with a 1972 Bedford Bus with a 300 petrol & a Comair body.
It has a Clayton Dewandre brake system but I'm not sure if it's air/hydraulic or vacuum/hydraulic.
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The compressor/exhauster needs attention as it sucks from the front side but has nothing from the discharge side, & can't get the head off it without removing the manifold. It has some bodgie hoses swinging in the breeze behind the gearbox, so I'm not sure which way it's supposed to be connected. Hope someone can help me out.
The unloader pipe seems to be broken off...........so its likely the compressor has been pumping continuous at relief pressure = lots of heat in the valves.......simplest thing to do is to remove the hex nuts on the head ,and see what the valves and springs look like....be aware ,if you remove the head ,the barrel will likely come off too,and you will have to refit the piston and rings.............you can buy these little Claytons new for a few bucks from surplus,but parts from a brake place will be very costly........everything from a brake place will be costly.