Importance

Loading Importance Indicators...

Abstract

A brake actuation apparatus includes a pneumatic booster and a master cylinder. A control rod in the booster responds to an input force for actuating a valve in the brake booster to develop an actuation force which is applied to a main hydraulic piston located in the master cylinder to pressurize fluid and effect a brake application. The main hydraulic piston includes a cylinder member with a bore therein for retaining a secondary hydraulic piston connected to the control rod. The cylinder member has at least one opening whereby pressurized fluid is communicated between the master cylinder and bore as function of a flow-rate reducer located in the one opening. The communication of fluid between the master cylinder and bore is always from the higher fluid pressure toward the lower fluid pressure. The fluid pressure in the bore acts on the secondary hydraulic piston to oppose the input force and thereby modify the time the valve remains opened by the input force and correspondingly the development of the actuation force for the pressurizing of fluid in the master cylinder.

Loading the Abstract Image...

First Claim