Usually pumping is carried out using a special device. However, the brake system can be bled using the brake pedal, this will require 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 has been made and appropriate precautions have been taken, it is sufficient to bleed only this part of the system.
Instruction. If one of the sections of the brake fluid replenishment bank is without brake fluid (e.g. brake leaks), 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 bleeder valves must be opened very carefully so as not to break them. It is recommended to apply a rust remover to the fittings about two hours before priming.
- If the bleeder fittings turn with difficulty, it is necessary to bleed the brake system at a service station. During pumping, it is necessary to monitor the level of brake fluid in the reservoir.
- The liquid level should not reach the bottom of the reservoir, as air will enter the system through the reservoir. Add only fresh brake fluid.
- Remove the dust cap from the wheel cylinder bleeder, clean it and put a clean transparent hose on it, lower the other end into a container partially filled with brake fluid. The container must be at least 300 mm above the bleeder port. This prevents air from entering the cylinder through the bleed screw threads.
- The assistant must press the brake pedal 3-5 times with an interval of 2-3 seconds to increase the pressure in the brake system. When pressed, an increasing resistance of the brake pedal should be felt.
- When sufficient pressure is reached, press the brake pedal all the way down and hold it in this position.
- Unscrew the bleed screw half a turn with a wrench.
- Continuing to press the pedal, force the fluid in the system together with air through the hose into a container. At the same time, make sure that the end of the hose is constantly in the vessel, below the brake fluid level (see fig. 11.16).
- After the pedal has reached its full forward position and fluid has stopped flowing through the hose, screw the bleeder screw all the way in
- Repeat these operations on this brake cylinder until the air from the hose stops.
- Wipe the bleeder valve and install the protective cap.
- Repeat these operations for 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 vacuum brake booster on bleeding the brakes, perform air removal with the engine off.
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