You will need fresh brake fluid when you bleed the air (specification according to the American standard FMVSS 116 DOT 4) and transparent hose. In addition, this will require the assistance of a second person. The vehicle must be on level ground on all four wheels. Attention! Keep an eye on the brake fluid level in the reservoir while bleeding! If necessary, add the appropriate amount of fluid to the tank. The tank must not be empty, otherwise air will enter the system again.
Safety note: If the level of the fluid in the tank drops so low during bleeding that air is sucked in, the system must be vented in a workshop using a special tool, as air can enter the hydraulic pump of the anti-blocking system. After installing a new brake hose, the air must also be vented in a workshop.
1. If necessary, treat all air valves with a rust remover a few hours before bleeding. This reduces the risk that the valves will be torn off when loosened.
2. Air bleeding sequence: rear right wheel brake cylinder - rear left wheel brake cylinder - front right wheel brake cylinder - front left wheel brake cylinder.
3. Remove the rubber cap from the air valve, clean the valve.
The air valve is best loosened with a ring wrench
4. Slide a plastic hose over the valve, lower the other end of the hose into a container to collect the escaping liquid. The container must be partially filled with brake fluid.
Removal of air from the brake system: A transparent hose is put on the valve. Poisonous, varnish-corrosive brake fluid is drained into a container.
5. Use the ring wrench to loosen the valve no more than one turn. At this time, the assistant should slowly press the brake pedal to the floor so that the brake fluid and the air contained in it are pumped out. At the same time, watch the hose and tank - you should see air bubbles. Have an assistant hold the pedal to the floor.
6. Close the air valve. Only then can you release the pedal.
7. Repeat this process until no more air bubbles appear. Constantly monitor the level of liquid in the reservoir, add liquid if necessary, but only in such an amount that the initial level is not exceeded. In this way, you will prevent a situation where, during the subsequent replacement of the brake linings, there is too much brake fluid in the system, and when the pistons of the brake cylinders are pressed, the reservoir overflows. Wait approximately three seconds for the master cylinder to refill with brake fluid before performing the next bleeding.
8. After the last pumping, the assistant should hold the pedal to the floor until the air valve is completely closed (don't hit the valve!).
9. Repeat all described operations on other air valves.
10. If the described method does not completely remove the air, close all air valves, start the engine and apply the brake several times. Then repeat the bleed process.
11. Finally, check all brake lines again (are they tight?), the fluid level in the reservoir and the operation of the brakes during the test drive. Brake once so that the anti-lock control works.
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