Usually, bleeding is done with a special device. However, the brake system can be bled using the brake pedal, for this you will need an assistant.
If bleeding of the entire system is required, each wheel brake cylinder must be bled.
If only a partial disconnection of the hydraulic brake system was made and the appropriate precautions were taken, it is sufficient to bleed only that part of the system.
Note: If one of the sections of the brake fluid replenishment bank is found to be without brake fluid (for example, in case of leaks in the brake system), for safety reasons, it is necessary to bleed the entire brake system. Bleeding sequence: 1. Right rear caliper; 2. Left rear caliper; 3. Right front caliper; 4. Left front caliper.
Attention
- The bleed nipples must be opened very carefully to avoid breaking them. It is recommended to apply a rust-corrosive agent to the nipples about two hours before bleeding.
- If the bleed nipples turn with difficulty, the brake system must be bled at a service station. During bleeding, it is necessary to monitor the brake fluid level in the replenishment tank.
- The fluid level should not reach the bottom of the refill tank, as air will enter the system through the refill tank. Add only fresh brake fluid.
- Remove the dust cap from the wheel cylinder bleeder nipple, clean it and put a clean transparent hose on it, the other end of which is lowered into a container partially filled with brake fluid. The container should be at least 300 mm above the bleeder nipple. This prevents air from entering the cylinder through the thread of the bleeder nipple.
- The assistant should press the brake pedal 3-5 times with an interval of 2-3 seconds to increase the pressure in the brake system. When pressing, an ever-increasing resistance of the brake pedal should be felt.
- Once sufficient pressure has been reached, press the brake pedal all the way down and hold it in this position.
- Using a spanner, loosen the bleed nipple half a turn.
- While continuing to press the pedal, force the fluid in the system together with the air through the hose into the container. At the same time, make sure that the end of the hose is constantly in the container, below the level of the brake fluid (see fig. 11.16).
- Once the pedal reaches the extreme forward position and the fluid stops flowing out through the hose, tighten the bleed nipple until it stops
- Repeat these operations on this brake cylinder until air stops escaping from the hose.
- Wipe the bleed nipple clean and install the protective cap.
- Repeat these operations for the other wheels.
- If there is no air in the brake system, the pedal should travel about half of its travel. To eliminate the influence of the brake booster on the bleeding of the brakes, bleed the air with the engine not running.
