Attention! Do not reuse used brake fluid! Used brake fluid is easily distinguished from fresh brake fluid by its darker color.
Attention! Never drain brake fluid down the drain or dispose of it in household waste containers! Information on the rules for the disposal of technical fluids can be obtained from service stations.
General information
The tools required to complete this procedure include the following:
- Ring wrench for unscrewing the air removal fitting;
- Transparent plastic hose with an inner diameter of 6 mm and a container for collecting brake fluid;
- The amount of brake fluid required Specifications;
Hydraulic fluid through the pores of the brake hoses and the vent hole of the master cylinder reservoir (GTZ) absorbs moisture contained in the atmosphere, as a result of which, during the operation of the car, its boiling point gradually drops, which is associated with the risk of reducing the efficiency of the functioning of the brake mechanisms as a result of active vaporization in the hydraulic tract at high braking loads.
The brake fluid should be changed at least once every two years, preferably in the spring.
Note. When driving in hilly terrain, change the brake fluid more frequently.
At service stations, air is usually removed from the brake system using a special device, however, if necessary, bleeding of the brake path can also be done using the foot brake pedal - the help of an assistant will be required. Description of the procedure for bleeding the brake system is given in Chapter Brake and auxiliary systems.
How to perform the procedure
With the use of a reserve tank and a device for pumping
1. Unscrew the GTZ reservoir cap.
2. Using a syringe or a rubber bulb, pump out liquid from the reservoir.
3. Following the manufacturer's instructions, connect a reserve container of brake fluid and a tract bleeder to the reservoir (see chapter Brake and auxiliary systems).
4. Proceed in the same way as when changing the differential lock hydraulic fluid (see Section Changing the Differential Lock Fluid), alternately drain the old brake fluid through the bleed valves, first drum brakes, then disc brakes.
5. Disconnect the reservoir tank and bleeder, then screw on and tighten the GTZ reservoir cap.
Without the use of reserve tank and pumping device
1. The replacement of the brake fluid is carried out in the process of bleeding the hydraulic path (see chapter Brake and auxiliary systems), - pumping should be carried out until clean, free from air bubbles, fresh brake fluid begins to flow out of the brake valves.
After performing the replacement
1. Make sure that the brake pipes and hoses are firmly fixed in all the provided clamps. Check the tightness of the fittings and bleed valves. Check the fluid level in the GTZ reservoir.
2. With the engine running, check the system for leaks. To do this, press the brake pedal about 10 times with a force of 200-300 N (corresponds to 20-30 kg). The brake pedal must not move back. Check all connections for tightness.
3. Finally, check the operation of the brakes on a road with light traffic. To do this, you must make at least one strong braking, checking the action of the ABS (a sign of ABS activation is an intense pulsation of the foot brake pedal when braking).
Note. The effect of ABS operation is best seen on roads without asphalt concrete pavement.