keeping them running
Page 83
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by Trevor Longcroft
either 12V operation and further switches for checking trailer lighting. Apart from ,complete vehicle checks the rig can be utilized for bench testing of individual components such as relay valves and spring brake actuators.
Using the adjustable controls available on all lines, the air pressure in the brake line can be gradually increased until the trailer brakes are adjusted to operate simultaneously. Also the possibility of a faulty tractive unit effecting the operation of the trailer brakes when being tested can be ruled out.
Anti-freeze
I may have given the impression (CM August 20) that Shellsafe and Snowdrift were the only anti-freezes available that could be used all the year round. In fact Duckhams Oil has produced a year-round anti-freeze for commercial vehicle use for three years. The Duckhams solution is glycol-based and incorporates an inhibitor. As with the Shellsafe and Snowdrift 25 per cent dilution is recommended.