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Disc Brakes by Lockheed
Page 105
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DiSC brakes for vehicles having a gross weight of up to 12 tons will be shown at the Commercial Motor .Show by the Lockheed Hydraulic Brake Co., Ltd.. Leamington Spa. A transmission disc brake will also be displayed.
The wheel disc brakes are produced as single-bore and twin-bore units, both with a variety of bore sizes. A cast solidbridge caliper unit is employed, and all fluid passages between the bores are internal ducts, so that fluid leakage and the danger of pipe fracture are eliminated.
(Left)This illustration shows the Lockheed twin-bore disc brake, which, like the single-bore type, has a solid-bridge caliper housing. All inter-bore fluid connections are provided by internal passages. (Right) Based on Lockheed hydraulic brake components, this transmission disc brake is designed for vehicles With gross weights of up to 12 tons and has a maxinuttn torque rating of 2,000 lb.-ft.
The moulded friction pads are bonded to the pressure plates, and there are apertures in the caliper casting enabling pad thickness to be checked. Pads can be replaced without disturbing the fluid lines. Operating pistons arc specially treated to obviate corrosion by the fluid.
The disc brake may be used with the company's new divided-line air-servo system, which provides power assistance for vehicles weighing up to 24 tons. Two independent hydraulic units have a common air supply, and if required the servos can be fed by a dual compressor and twin air lines.
The input side of each slave cylinder is connected to a tandem master cylinder, and the output sides are joined separately to the front and rear brakes. Fluid is supplied to the master cylinder from a transparent tank fitted with a fluid-level warning device.
Based on Lockheed hydraulic brake components, the transmission disc brake