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#11
21st September 2011, 22:48
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Footbrake adjustment.
As the master cylinder actuator is operated by air pressure from the footbrake valve, brake shoe travel is not reflected in brake pedal movement. To provide an indication of brake shoe travel an indicator rod is incorporated in the dual actuator. The rod moves out of the actuator housing to the same extent as the pushrod moves to operate the master , and when the red band on the indicator rod is fully exposed the brake shoes require adjustment. Before adjusting the brakes, check the hub bearings for slackness. If necessary, adjust the bearings. Check also for excessive wear of the leading shoe linings. These can be examined through the inspection hole in each backplate. To adjust, jack up each wheel in turn and proceed in the sequence given below. When adjusting the rear brakes, skotch the front wheels and release the parking brake. 1 Charge the system to operating pressure. 2 Turn the shoe adjuster anti-clockwise until the drum is free to rotate. 3 Turn the front shoe adjuster clockwise (see fig N21) until the shoe is hard against the drum. Centralize the shoe by applying heavy pressure to the brake pedal, then release the pedal. 4 Back off the adjuster until the shoe is just clear of the drum, ie so that the wheel rotates freely without the shoe rubbing. 5 Repeat operations 3 and 4 on the rear shoe adjuster. Repeat for each wheel in turn. 6 Push in the indicator rod on the air actuator until it contacts the piston. Illustration of brake adjusters:- http://i24.photobucket.com/albums/c1...n/IMGP8511.jpg 
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#12
15th June 2013, 15:25
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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 
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#13
15th June 2013, 16:33
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Quote:
See item 23 on this illustration:- http://i24.photobucket.com/albums/c1...n/IMGP8509.jpg Quote:
Follow the procedure listed above. Last edited by G-CPTN; 15th June 2013 at 16:38.
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#17
15th June 2013, 19:02
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Or maybe it's here......
Basically there is the big black unit which includes the master cylinder, or next to it the other side of a chassis joist is a cylinder which is also black, but I can't see the indicator rod anywhere on either units.... Feeling blonde! On the plus side I found where my air filter is, and after a lot of faffing about (the coach builders who put the horse bit on the back of the lorry have made it very difficult to get the filter out without totally removing the whole unit)I managed to get it off and found that it was totally black and choked up, so a new one is now on its way.
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#19
15th June 2013, 19:11
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Quote:
Sorry!
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#20
15th June 2013, 20:01
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Never mind, thanks for your help anyway
My lorry is old... Almost as old as I am! But she runs really well except this darn brake problem. Looks like I will have to start saving up for a new lorry as the French here don't know what they are doing with regards to her and I am loathed to let them touch her as they don't seem to do a lot and then send me a 500E bill for the pleasure!
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