Reaction disc for a brake booster

Abstract

A reaction disc used in a brake booster, in particular, an improvement of an air vent formed in the outer periphery of the reaction disc is disclosed. The reaction disc is provided with a circumferentially discontinous bulge on its external peripheral surface, and a discontinuity in the bulge provides an air vent passage. A burr is formed on the external peripheral surface of the reaction disc as displaced from the bulge. The bulge has a height which is chosen to be greater than the height of the burr. When a reaction disc thus constructed is fitted into a recess of a push rod, the air vent passage provides a positive venting action for the air trapped in the recess. Accordingly, no deburring operation is required during the manufacture of the reaction disc.

Dependencies are inferred from the claim text.