Abstract: There is disclosed a retaining spring for a brake shoe of a spot-type disc brake having resilient arms which abut on guide pins at both sides of the brake shoe backing plate. The spring provides good alignment of the brake shoe parallel to the brake disc when the brake is released.

Abstract: To reduce the overall weight of mechanically controlled brake boosters it is known to transmit the axial reaction forces by means of axial draw bars or pipes extending axially within the booster housing. According to the present invention the weight reduction and a decrease in axial length of the brake booster is accomplished having the booster housing shaped like a ring which surrounds and is connected to the maste brake cylinder. The master brake cylinder is fastened to the vehicle splashboard via axial webs extending beyond a lateral wall of the booster housing. A yoke arranged movably between the splashboard and the booster housing contains the valve mechanism and transmits the boosting force from the booster piston (movable wall) to the piston of the master brake cylinder.

Abstract: The actuating device comprises an actuating nut and spindle combination disposed in a brake piston, the spindle being rotated by an actuating lever and the nut having an outer thread engaging an inner thread of the brake piston thereby providing a brake pad clearance adjusting device. The brake piston is rotatably connected to the spindle via a one-way clutch for progressively screwing the brake piston out of the nut to compensate for brake pad wear. The one-way clutch is connected to the spindle by a rod extending through an axial bore in the spindle enabling the clutch to be unlocked from the outside of the actuating device for resetting the brake piston when worn brake shoes are being replaced.

Abstract: A brake pressure control unit for a vehicle hydraulic brake system having two separate brake circuits to control brakes at the rear wheel of the vehicle comprising a first valve to control one of the two brake circuits, a second valve to control the other of the two brake circuits, each of the first and second valves being disposed between an inlet chamber connected to a fluid pressure source and an outlet chamber connected to a different one of the two brake circuits, a movable partition wall disposed intermediate the two brake circuits and controlling the first and second valves, a by-pass conduit by-passing one of the first and second valves, and a deceleration-responsive valve disposed in the by-pass conduit.

Abstract: There is disclosed a reducer unit for a motorcycle brake system including a hand master cylinder actuatable by hand force and a pedal master cylinder actuatable by force applied to the pedal. The reducer, which is connected to both master cylinders, ensures at all times optimum brake force distribution, in spite of different actuating forces. In this arrangement, the valve closure member controlling the connection between the pedal master cylinder and the rear-wheel brake is influenced by the pedal master cylinder pressure such that it is allowed to assume its closing position only when pressure is built up by the pedal master cylinder. Vacuum otherwise occurring in the rear-wheel brake is thus effectively avoided.

Abstract: There is disclosed a dual-circuit brake-force distributor wherein the control force of one circuit is transmitted to the other circuit through a floating intermediate piston. In order to achieve a highly sensitive control, the intermediate piston is provided with a large cross-sectional area. In the event of failure of the one circuit, the intermediate piston will become blocked and the control force will be transmitted through an auxiliary piston having a smaller cross-sectional area. By this arrangement upon failure of the one circuit a sufficient amount of braking pressure can still build up in the other intact braking circuit.

Abstract: A method for locating defects in a hydraulic brake system, in which a master cylinder is in communication with the outlet port of a compensating reservoir, which includes the steps of placing a measuring burette on the compensating reservoir's outlet port and operating the brakes to measure and determine the volume of brake fluid that flows from the master cylinder to the compensating reservoir when the brake is applied. A compensating reservoir making use of the method includes a measuring opening adapted to be closed by a measuring burette positioned above the outlet port of a compensating reservoir which outlet port is in communication with the master cylinder. Where the compensating reservoir includes a float acting as a level indicator, which is connected by a rod to a circuit operating contact piece or member, the rod is hollow and is arranged to pass through the float and the contact piece.