Wider Use of C.D.L.T. Brake System?
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Dp.TAILS of the braking system developed by the Clayton Dewandre Co., Ltd., and London Transport, which deters drivers from pulling up too sharply at niarmal stops, were given to the north-astern centre of the Institute of Road Transport Engineers recently by Mr. S. H. Edge, chief engineer and assistant general manager of the company.
During the discussion which followed Mr. Edge's lecture, "Vacuum and Air Brakes for Public Service and Heavy Goods Vehicles," the greater use of the device was advocated.
By the use of this system, the build-up of brake power was halted at a force determined as sufficient for normal use at a point in the travel of the brake pedal. Beyond this point, further depression of the pedal did not increase the brake power until full depression occurred, when a build-up for emergency application was caused.
The brake valve employed was of the reaction type and pressure in the brake cylinders was proportional to pedal travel: the relation was not "straightline," but followed a performance curve which reflected light brake operation up to about 9 ft. per sec. per sec. for normal ranges of deceleration, and heavy pedal effort for a high rate of retardation.