Service brake system with hydraulic drive
The hydraulic braking system of this vehicle brakes all wheels. At the same time, the front brakes are disc brakes with a floating caliper, in which the braking force on the wheel is developed by one working cylinder. Rear brakes - drum type.
The composition of the working brake system includes the following elements:
- master brake cylinder (further - GTZ) with a vacuum brake booster and with an expansion tank of the hydraulic system;
- four wheel brake cylinders;
- rigid hydraulic pipelines to the wheels;
- flexible hoses supplying pressure to the wheel cylinders.
Master brake cylinder
The brake master cylinder is designed for use in diagonal split systems. One front and one diagonally opposed rear brake is served by the primary piston. The opposite front and rear brakes are serviced by a secondary piston. The brake master cylinder performs the functions of a standard dual brake master cylinder and also includes a low fluid level indicator and restrictor valves for non-ABS brakes. Restriction valves limit the pressure on the rear brakes when the brake master cylinder reaches a predetermined pressure.
Brake booster
The amplifier is a single diaphragm vacuum type amplifier. In the normal state, when the brake pedal is released, there is a vacuum on both sides of the diaphragm of the vacuum booster.
When the brake pedal is depressed, atmospheric air pressure is applied to one side of the diaphragm, providing boost. When the brake pedal is released, the air supply to that side of the diaphragm stops. The air is then removed from the booster through a vacuum valve.
Front disc brakes
The front brake caliper is attached to the steering knuckle with two screws. The hydraulic pressure generated when the brake pedal is depressed is converted by the hydraulic cylinder into braking force. This force is evenly distributed between the outer and inner brake pads, which are pressed against the brake disc, forming a braking force.
Rear drum brakes
Both drum brake pads are pressed against the wheel cylinder pistons by the upper and lower return springs. The front brake pad provides the main braking force when the wheel rotates in the forward direction, the rear one - when the wheel rotates backward. The braking force is transmitted through the brake shield, on which the pads are attached, to the rear suspension arm. The clearance between the pads and the drum is adjusted automatically and occurs every time you press the brake pedal.
Anti-lock braking system (ABS)
Anti-lock braking system (ABS) serves to ensure the maximum possible braking intensity under specific road conditions (and hence the minimum stopping distance) while maintaining vehicle stability and control.