Little update
Have replaced air servo and master cylinders, brakes were better, but yesterday had brake failure again.
I can't find the indicator rod that you mentioned on the air servo, but the brakes seem to be well adjusted and there is plenty of meat left on the brakes shoes. My brake fluid levels are fine and the air pressure is around 7 on the dial.
But when I brake the pedal travels with no resistance to the floor and then I have minimal braking once my foot is on the floor.....
Any suggestions welcome
