Comprehensive Brake-testing
Page 65
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DMPREHENSIVE testing of vehicle brakes is possible when the Don ke Meter is combined with a new rument—the Pressometer.
he Mark III Don Brake Meter is a ke test instrument approved by the listry of Transport and records eleration as a percentage of " g ". The ssometer measures the physical effort rted at the brake pedal tb achieve a t.n deceleration. Apart from assessit of braking efficiency, the combined rument can also be used for checking characteristics and efficient operation the servo unit incorporated in the king system of commercial vehicles. tecording heads of the two instruments mounted in a dual housing attached a cast-iron floor stand, which has a omium-plated carrying handle and a ber-covered base to prevent sliding. : twin housing has a pivoted centre ;e to enable the brake meter to be set zero; this centre piece is friction iped so that it will not vibrate away from the zero position. Both instruments have a recording needle to facilitate reading.
The Pressometer contains a hydraulic load cell, connected to the recording head by armoured hose, a compensating device allowing for variations in barometric pressure. The load cell is attached to the brake pedal by a screw clamp designed to fit all types of brake pedals and the recording head is calibrated in increments of 5 lb. up to 350 lb., which is adequate for all types of vehicle.
Manufacture of the combined Brake Meter and Pressometer is by the Engineering Division of Bowser, Monks and Whitehouse, Ltd., Doncaster. Sole distribution is by Small and Parkes, Ltd„ Manchester, 9.
Trade price of the unit, with the Mark lii Brake Meter is £24 7s.