Abstract: The improved release mechanism comprises a load sensor (50, 51, 150, 250, 350, 450) connected with a wheel brake (10, 110) to sense a change in wheel braking torque and communicate responsively with a mechanical brake control device (200) or a braking assistance servo-motor system (310, 320; 410, 420) which releases the brakes when the vehicle commences acceleration along an incline.

Abstract: A brake booster (10, 210) connected to a control circuit (120) provides a system for the continued braking of a vehicle when the vehicle is situated on an incline and the brake pedal (92) is released by the operator. Continued brake application is accomplished by utilizing a control circuit (120) responsive to vehicular attitude, clutch pedal position, and vehicular direction. The control circuit (120) is connected to the combination of a check valve and two-way solenoid valve (100, 200) connected to a movable wall brake booster (10, 210). The combination valve (100) is connected to a flexible hose (110) disposed interiorily of the booster (10), and the other end of the flexible hose (110) connected to the input opening (32) of a three-way poppet valve (70) located at the central hub (30) of the booster (10).

Abstract: A brake control device (20) is disposed between a brake pedal (12) and a clutch pedal (10) to retain the brake pedal (12) in an applied position when the clutch pedal (10) is depressed and the vehicle is facing downhill on an incline and in reverse gear, so that the vehicle operator may remove his foot from the brake pedal (12). A control circuit (110) includes a backup light switch (114) and attitude switch (116) for operating a solenoid actuator (120) that applies a locking ball (28) of the brake control device (20). A brake control device (320) may be operated by a solenoid actuator (325) controlled by an electronic control unit (340) so that the brake pedal (12) is retained in an applied position whenever the vehicle is stationary and the clutch pedal (10) depressed.