CINCINNATI, October, 1949: Airplane-type hydraulic brakes have become standard equipment on all Crosley cars, it has been reported by Powel Crosley, Jr., president of Crosley Motors, Incorporated.
The new disc-type hydraulic brake was subjected to rigid testing for a year before it was adapted, Crosley said. He described it as a direct adaptation of the Goodyear-Hawley aircraft brake now used on private, commercial and military planes.
The "Hydradisc" brake differs radically from conventional auto brakes, Crosley said. The latter operate through outward expansion of brake shoes against the inner surface of a brake drum. In the new Crosley brake, a cast-iron disc, instead of a drum, rotates as part of the wheel. In place of brake shoes there are two friction "spots" which are fixed on opposite sides of the disc. When the brake is applied the "spots" clamp against the disc under hydraulic pressure, it was explained.
"Because the two 'spots' faced with brake lining material engage only a small part of the revolving disc surface at a time, all the rest of this surface remains comparatively cool," Crosley added. "Application of braking pressure on a disc instead of a drum prevents the 'fading' which usually results from water, mud, snow, ice or oil in the drum. These lubricants are slung off the disc by centrifugal force and the friction spots, under pressure, wipe clean their path at each revolution of the wheel and disc."
Besides providing maximum safety and longer brake life, Crosley said, the new hydraulics have the advantage of a simple single-screw adjustment that is easily accessible.