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
6.3. Electric system
6.4. Technical characteristics
6.5. Parking brake
6.6. Technological service and repair of the brake system
6.6.1. Replacement of brake shoes of forward wheels
6.6.2. Repair of a support of a brake of a forward wheel
6.6.3. Replacement of brake shoes of back wheels
6.6.4. Repair of a support of a brake of a back wheel
6.6.5. Removal and installation of a tank of brake fluid
6.6.6. Pumping of the brake system
6.6.7. Replacement of brake fluid
6.6.8. Replacement of elements of the drive of the parking brake
6.6.9. Replacement of the main brake cylinder and vacuum amplifier
6.6.10. Replacement of elements of anti-blocking system of brakes (ABS)
6.6.11. Check of a side beating of pulse wheels
6.6.12. Removal and installation of a forward pulse wheel
6.6.13. Replacement of a pulse wheel of the back brake mechanism
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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6.6.7. Replacement of brake fluid

It is recommended to change brake fluid after 45 000 km of a run or every two years. If brakes are used with big loading, for example, when driving in the hilly area, and also in the conditions of tropical climate at high humidity, it is necessary to change brake fluid once a year. Brake fluid is hygroscopic, i.e. it has property to absorb water molecules from air. Absorption happens through the brake hoses and a tank of brake fluid made respectively of rubber and plastic, which somewhat pronitsayema for air molecules. Increase in content of water in brake fluid leads to considerable decrease in temperature of boiling of brake fluid, and also to corrosion of elements of the brake system. It is resulted by damage of the brake system, and its functioning considerably worsens.

It is possible to use only the original Volvo brake fluid with marking of DOT 4+ (minimum). It is impossible to reuse old brake fluid. Brake fluid has to be stored only in the original packing which is hermetically closed.

Preparation for replacement of liquid is similar to preparation for pumping of the brake system. Further it is necessary to work in such order:
— remove a protective cap from the drain union and connect to it a transparent hose of drain capacity;
— unscrew the union approximately on one turn;
— lift pressure in the brake system by means of the special device;
— merge 0,2 — 0,2 l of brake fluid;
— close the drain union and disconnect a hose;
— put a protective cap.
Carry out pumping and replacement of liquid in the following order:
— right back wheel;
— left back wheel;
— right forward wheel;
— left forward wheel.
After replacement of brake fluid check of the brake system is obligatory.

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6.6.6. Pumping of the brake system
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6.6.8. Replacement of elements of the drive of the parking brake