2. Brake fluid should be replaced periodically.
3. Never reuse the liquid.
4. While pumping, do not allow the fluid level of the reservoir to drop below "Min" lines.
5. Before starting work, check that all pipes and hoses are connected. Do not allow liquid to come into contact with the plastic or paintwork of the vehicle. Rinse any leakage immediately with cold water.
6. If the hydraulic fluid level has decreased due to a leak in the system, then after eliminating the malfunction it is necessary to bleed the system.
7. There is a way to bleed the brakes by one person, independently; kits for such bleeding of the brakes are currently available in car dealerships. If these kits are not available, you need a clean glass container and a suitable length of plastic or rubber tube, which with a special spanner of the required diameter are needed for pumping. The help of a second person will also be necessary.
8. If the hydraulic system has only been partially disassembled and the necessary precautions have been taken to minimize fluid loss, it is sufficient to bleed only that part of the system.
9. When bleeding the entire system, work should be carried out in the following sequence.
For early models (master cylinder with one bushing and two metal hydraulic pipe couplings):
- 1) Pressure reduction valve
- 2) Left rear brake
- 3) Right front brake
- 4) Right rear brake
- 5) Left front brake
Note: In exceptional cases, it may be necessary to pump point 1 again after points 2 and 3 (secondary circuit) and after points 4 and 5 (primary circuit).
For later models (dual chamber master cylinder with four metal hydraulic pipe couplings):
- 1) Left rear brake
- 2) Right front brake
- 3) Right rear brake
- 4) Left front brake
Pumping is the main method (two people)
10. Clean the areas around all fittings that need to be unscrewed, then remove the dust cap from the first one. Place the wrench and hose on the fitting, lower the other end of the hose into a container with a small amount of brake fluid so that the end of the hose is immersed in it. Remove the master cylinder reservoir cap, and fill the level to the mark "Max". Install the cover without clamping it, do not forget to ensure that the liquid level does not drop below the level throughout the entire pumping procedure "Min" lines to prevent air from entering the system.
11. One person presses the brake pedal all the way to build up pressure, then locks it in when fully pressed.
12. While the pedal pressure is maintained, unscrew the fitting (approximately one turn) and drain the liquid and air into a container (photo). An assistant must maintain pressure on the pedal. When the liquid stops flowing, tighten the fitting again. Release the pedal slowly and check the fluid level in the reservoir.
8.12. Bleeding the hydraulic system (front brake caliper fitting)
13. Repeat the steps indicated in steps 11 and 12 until the liquid flowing from the fitting is free of air bubbles. If the master cylinder has been drained and refilled, bleed in order from the first connection, with approximately 5 seconds between cycles for the master cylinder passages.
14. When air bubbles stop appearing, tighten the fitting, remove the tube and install the dust cap. Do not overtighten the pipes.
15. Repeat the procedure on all other pipes until all air has left the system.
Bleeding - Unidirectional Valve Kit
16. Connect the pipe to the nozzle, open the nozzle one turn.
17. Press the brake pedal, then slowly release it. The included one-way valve will prevent removed air from returning to the system. Repeat this step several times to make sure there is no air in the system.
18. Tighten the fitting, remove the pipe, install the dust cap.
Bleeding - pressure bleed kit
19. Connect a sealed, fluid-filled container to the master cylinder reservoir, bleeding by opening each port in turn and allowing fluid to flow until air is removed from the system.
20. Pressure bleeding is especially effective when the system is hard to bleed, or when the system is being completely bled during a routine fluid change.
All methods
21. After bleeding is complete, check the level and add fluid to the master cylinder reservoir.
22. Check the sensitivity of the brake pedal.