Design Features

Cars Chevrolet / Daewoo Lanos equipped with two independent braking systems: service and parking. First, equipped with hydraulically operated brake the motion of the car, the second inhibits the car in the parking lot. Working dual system, with a diagonal connection brakes front and rear wheels. A hydraulic drive circuit provides the right front and left rear brake, the other - the left front and right rear.

In case of refusal of one of contours of working brake system uses a different path, stops the car with sufficient efficiency.

The hydraulic booster is included, and pressure regulators in hydraulic rear brake.

Parking brake system has a cable drive to the rear wheel brakes.

Front brake disc, with automatic adjustment of the gap between the pads 1 (Fig. 9.1) and the disc 4, with floating caliper. The movable bracket is formed by single-piston caliper 2 c slave cylinder. Guide 3 blocks bolted to the steering knuckle. The movable bracket is bolted to the guide pin 5 mounted in the calliper holes. The guide fingers are lubricated with grease and protected by rubber covers. In the cavity of the wheel cylinder mounted piston with a sealing ring. Due to the elasticity of the ring supports the optimum gap between the pads and ventilated disk, the surface of which is protected by a shield brakes. During braking, the piston under the influence of fluid pressure presses the inner pad to the disc, as a result of the reaction force moves the caliper on the fingers and the outer shoe is also pressed against the disk, wherein the pressing force is the same pad. When disinhibition piston by the resilience of the sealing ring is removed from the pads, between the pads and the disc is formed a small gap.

The main brake cylinder

1 (Fig. 9.2) of the "tandem" hydraulic brake actuator is composed of two chambers connected with independent hydraulic circuits. The first chamber is connected to the right front and the left rear brakes, the second - with the left front and right rear.

In the master cylinder through a rubber nipple 4 is mounted a tank 2, the inner cavity of which is divided by partitions into three compartments. Each bay feeds one of the chambers of the master cylinder and master cylinder drive clutch.

When you press the brake pedal pistons of the master cylinder begin to move, sealing lips cover compensatory holes, cameras and uncoupling tank and begins the displacement of brake fluid.

The stopper 3 tank mounted brake fluid level. If the oil level drops below the permissible in the dash warning light illuminates the state of the brake system.

Servo (Fig. 9.3) arranged between the pedal mechanism and the master cylinder during braking by the vacuum in the intake pipe of the engine through the rod and the piston of the first chamber of the master cylinder generates an additional force, proportional to the force from the pedal.

The hose connecting the vacuum booster to an inlet pipe, a check valve. He keeps the booster negative pressure when it drops in the intake pipe and prevents the fuel-air mixture in the vacuum booster.

Pressure Regulators 5 (see. Fig. 9.2) installed on the master cylinder, correct braking the brake fluid pressure in the rear brake mechanisms, eliminating the possibility of advanced locking of the rear wheels. This is achieved by proportional decrease in pressure in hydraulic brake rear wheels relative to the pressure in hydraulic brakes of the front wheels. The ratio of the pressure in the front and rear cylinders working at different values of force on the pedal is shown in Table. 9.1.

Table 9.1 Value pressures of circuit hydraulic brakes, sustained pressure regulators

Rear brake drum, with automatic adjustment of the gap between the pads and the drum. Brake pads 1 and 11 (Fig. 9.4) are driven by one hydraulic slave cylinder 8 with two pistons. The optimum gap between the drum and the mechanical governor is supported by blocks 6 mounted on the spacer bracket 9.

The parking brake is actuated mechanically consists of a lever mounted on the basis of the body between the front seats, front cable from the adjustment device and an equalizer to which are attached two rear cable and expander arms 10 (see. Fig. 9.4), established in Rear brake.

The parking brake does not require special care. At the current repairs, check the degree of wear of the teeth and pawl sector. Excessive replace worn parts.

If you find an open shells or delays cables necessary to replace them with new ones.

The hydraulic braking system is integrated into a single unit with metal pipes and hoses. The system is filled with special brake fluid grade no lower than DOT-4, which must be replaced periodically. To replace the brake fluid is described in Sec. 4 "Maintenance" (see. "Replacing the brake fluid in hydraulic brake and clutch").

Check the brake system is described in Sec. 4 "Maintenance" (see. "The first maintenance (TO-1)").