Abstract: A circuit is provided for thermally regulating a vehicle equipped with an electric retarder (2), using the forced circulation of a liquid successively through the engine (1,5) of the vehicle, a radiator (7) and a drive pump (6). An auxiliary circuit section (10) is provided comprising a heat exchanger (11) adapted to remove heat coming from the retarder or to yield up heat to the air current thrown back by the rotor of this retarder and a three-way electro-magnetic valve (12) adapted to bring this section (10) into circuit depending on whether the retarder is energized or not and/or whether the temperature of the liquid in the radiator exceeds a certain threshold or not. A second auxiliary circuit section (15-17) allows the passenger space of the vehicle to be heated.

Abstract: Apparatus for hydraulic control of friction brakes of an automobile vehicle which comprises a first master-cylinder directly connected to the hydraulic brake circuit and operated by the driver's brake pedal and a second master-cylinder operated by release of the gas pedal, and connected to the first master-cylinder in place of the reservoir thereof. The first master-cylinder is a tandem master-cylinder which comprises a first piston connected by the intermediary of a linkage to the brake pedal and a second piston dividing the interior of the first master-cylinder into first and second chambers. The first chamber is located between the two pistons and is connected to a first hydraulic brake control-circuit, while the second chamber is situated at an end of said cylinder and is connected to a second hydraulic brake control-circuit. The two chambers are supplied with liquid.

Abstract: A vehicle hydraulic braking installation includes a main master-cylinder 1 operated by the driver's brake pedal with or without servo-assistance and an additional master-cylinder 13 which is operated when the driver releases the accelerator pedal. The additional master-cylinder is connected to the braking circuit only through the main master-cylinder. As soon as the main master-cylinder begins to be operated, the main master-cylinder cuts off any communication between the additional master-cylinder and the braking circuit.