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KEEPING THEM RUNNING

23th August 1968, Page 43
23th August 1968
Page 43
Page 43, 23th August 1968 — KEEPING THEM RUNNING
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with Ron Cater / One of the problems which can defy every effort to cure it—short of changing an axle —is brake grab. A Lancashire-based company has discovered that a drum quite often changes its shape when assembled onto its hub, and has purchased some special machinery which will grind the working surfaces of drums while assembled to hubs and radius brake linings to exactly the profile of the drum, Investigations carried out by the firm, Stopwell Brake Services (associated with Oliver Hart and Sons Ltd.) have revealed that of a large number of assemblies passed through the trueing service so far, not one has been running true. The best example was running out of true by some 0.020i and the worst by 0.085in. In every case the actual friction surface of the drums was found to run either out of square or eccentrically.

By radiusing the linings there is no need for a bedding in period before the liner assumes a perfect mating surface with the drum; this is claimed to eliminate local hot spots which are the start of drum crazing and general distortion.

Considerable increase in lining life is claimed for assemblies which have passed through the trueing process. One case history shows that lining life was increased from 12,000 to 40,000 miles.

The full address of the firm is: Stopwell Brake Services, Blainscough Garage Coppull, Lancs. (Tel: Coppull 341 /2 /3.)

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