rear brake sticking on volvo coach

[gary2411]

i drive avolvo coach which has a problem with the o/ side rear brake sticking on we have changed every valve thats to do with the rear brakes but it still sticks theand problem is it wont do it all the time ,sometimes it wont do for days then you wii get a day and it might do it four or five times

[TWR]

Have you serviced / greased the Auto Adjuster?

[sddsddean]

Could be the return spring between the shoes is broken. First thing I'd do is whip off the wheels and drum and have a good look round. Its more likely to be a mechanical fault rather than problems with air valves.