S40/V40
1. General information
2. Operation and maintenance of the car
3. Design and technical characteristics of engines
4. Repair of the engine
5. Transmission
6. Brake system
6.1. General information
6.2. Appointment and short description of elements of hydraulic system of a working brake
6.2.1. Work of hydraulic system when braking
6.3. Electric system
6.4. Technical characteristics
6.5. Parking brake
6.6. Technological service and repair of the brake system
7. Forward suspension bracket and steering
8. Back suspension bracket
9. Control system of the Fenix 5.1 engine
10. Electric equipment. Conducting and components
11. Body
12. Schemes of electric equipment
 



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6.2.1. Work of hydraulic system when braking

Fig. 6.1. Components of the brake system and their arrangement on the car: 1 — a brake pedal; 2 — the stoplight switch; 3 — the hydrovacuum amplifier of brakes; 4 — the main brake cylinder; 5 — the ABS block (anti-blocking system); 6 — the regulator of pressure of back brakes; 7 — the lever of the parking brake; 8 — a support of a back wheel; 9 — a support of a forward wheel; 10 — the sensor of speed of a back wheel; 11 — the sensor of speed of a forward wheel; 12 — a tank for brake fluid


Fig. 6.2. Scheme of hydraulic system of a working brake: 1 — backpressure valves; 2 — the valve of the plunger pump; 3 — the hydroaccumulator; 4 — the camera of suppression of a pulsation in system; 5 — the electric motor with the eccentric plunger pump; 6 — a tank for brake fluid; 7 — a pedal of a working brake; 8 — the amplifier; 9 — the main brake cylinder; 10 — the ABS block; 11 — the final operated valves; 12 — the inlet operated valves; 13 — the drosseliruyushchy valve; 14 — 17 — brake mechanisms


By pressing a pedal of the 7th brake its lever releases the button of the switch of a stoplight which, working, includes bulbs of stoplights and brings ABS to a state on duty. The movement of a pedal through a rod and the vacuum amplifier 8 is transferred to pistons of the main cylinder 9. The central valve in the secondary piston and a cuff of primary piston block the message of contours with a tank 6 for brake fluid. It leads to growth of pressure in brake contours. It affects pistons of brake cylinders in brake supports. As a result nestle on disks. At a pedal otpuskaniye all details come back to a starting position.
If when braking one of wheels is close to blocking (what reports the rotation frequency sensor about), the control unit blocks the inlet valve 12 of the corresponding contour that interferes with the further growth of pressure in a contour irrespective of growth of pressure in the main cylinder. At the same time the hydraulic plunger pump 5 begins to work. If rotation of a wheel continues to be slowed down, the control unit opens the final valve 11, allowing brake fluid to come back to hydroaccumulators 3. It leads to reduction of pressure in a contour and allows a wheel to rotate quicker. If rotation of a wheel excessively accelerates (in comparison with other wheels) for increase in pressure in a contour the control unit blocks the final valve 11 and opens inlet 12. Brake fluid moves from the main brake cylinder and by means of the plunger supercharger 5 of hydroaccumulators 3. Damping cameras 4 smooth (suppress) the pulsations arising in system during the operation of the plunger pump.



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6.2. Appointment and short description of elements of hydraulic system of a working brake
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6.3. Electric system