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An additional brake system is called a mountain brake. It provides the movement of the car at a low speed. It is installed on trucks, road trains and buses.

Wear-resistant and safe

Heavy cars do not need high-speed records. But confidence does not interfere with travel on mountain roads. With their endless descents and ascents. If the car goes downhill, it gradually accelerates. When, in the opinion of the driver, the speed becomes dangerous, it slows down. But soon the speed again increases. On a long descent, it is necessary to brake repeatedly. Wear tires. Brake linings are heated. Reduces the coefficient of friction of the lining on the brake drum. This leads to a decrease in the efficiency of the main brake. And, as a consequence, to the accident. The mountain brake allows the working brake system to rest, remaining in a cold state. That in a critical situation, she did not refuse. I stopped the car. After all, the mountain brake can not do it. There are three types of auxiliary brakes: motor, hydraulic and electric. At idle, the retarder can be operated by the engine itself. But its braking moment is enough only for a car.

In the heart of the car

The motor brake is a special device,turning off the fuel supply. It is installed in the engine of the machine. During braking, the damper covers the pipe of the muffler and moves the rail of the fuel pump. Gasoline does not come. The engine stalls, but the crankshaft continues to rotate. The piston tries to push the air out of the cylinders. He feels strong resistance. Because of this, the rotation of the shaft and, accordingly, the driving wheels is slowed down.

Wheels in oil

The hydraulic retarder consists of two wheelswith blades. They are located in parallel. The distance between the wheels is small. A rigid connection is missing. One wheel is fixed to the driveshaft and rotates with it. The second is on the brake casing. It is motionless. The hydraulic brake housing is filled with oil through a special pump. It is accelerated by the blades of the rotating wheel. It flows into a stationary one and loses speed. Once again on the first wheel, the oil slows its rotation. The brake torque is transmitted to the driving wheels of the car.

Under the action of a magnetic field

In the electric braking system with shaftthe rotor is connected. And the stator windings are placed in the body. When voltage is applied to them, an electromagnetic field appears. It does not allow the rotor to rotate at the same speed.