Table of contents: Manual pumping 🠇 Pumping with a special device 🠇
Warning! Brake fluid is poisonous and should never be sucked out with your mouth through a hose. If brake fluid gets on your skin, immediately rinse the affected area thoroughly with water; if brake fluid gets into your eyes, seek medical attention immediately.
Some types of brake fluid are flammable.
Brake fluid has a corrosive effect, so it should not come into contact with car varnish. If brake fluid gets on a painted surface, immediately wipe off the liquid and rinse the surface with plenty of water.
Brake fluid is hygroscopic, meaning it absorbs moisture from the air, so store the fluid only in closed containers.
Brake fluid should not come into contact with petroleum products. Even small amounts of petroleum products make the brake fluid unsuitable for use or lead to failure of the brake system.
Brake fluid that has already been used once cannot be refilled. Always fill with fresh brake fluid.
After each repair, during which the brake system was opened, it should be bled to remove any air that got in. The presence of air in the system is indicated by the brake pedal "failing".
Bleeding the brake system can be done manually or using a special tool.
If the car is equipped with ABS, then when bleeding the system in the workshop, the appropriate device is used. Therefore, bleeding the brake system of a car with ABS on your own is allowed only with certain reservations. First of all, before removing air from the brake system with ABS, you should disconnect the battery.
Attention! ABS hydraulic unit components (valves, pump, etc.) must be pumped in the workshop using a special device.
1. Place the car on a horizontal surface and block the wheels.
Text taken from the website: Peugeotbook.ru
2. Make sure all lines and hoses are securely connected and the bleed screws are closed. Clean the area around the bleed screws and the brake fluid reservoir cap.
3. If only one wheel cylinder or caliper was opened, it is enough to remove air from the corresponding brake circuit. Bleeding can begin from the rear wheels, and then move on to the front wheels. However, it is recommended to follow the vehicle manufacturer's instructions regarding removing air from the brake system. The manufacturer suggests the following bleeding sequence:
- a) rear right wheel brake mechanism;
- b) rear left wheel brake mechanism;
- c) front right wheel brake mechanism;
- d) front left wheel brake mechanism.
Manual pumping
4. Remove the protective cap from the corresponding bleed nipple and place a transparent hose on the nipple. Place the free end of the hose in a container half filled with brake fluid.
5. Have an assistant depress the brake pedal to build up pressure in the system.
6. Check the brake fluid level in the expansion tank - it should always be above the minimum mark.
7. Unscrew the bleed nipple and allow the liquid to flow into the container.
8. When there are no air bubbles in the flowing fluid, close the bleeder nipple, then ask an assistant to slowly release the brake pedal.
9. Repeat the bleeding procedure on the remaining brake mechanisms, following the bleeding sequence specified above, until all air is removed from the system. Upon completion of bleeding, the brake pedal should become elastic and move smoothly, without "failures". Repeat the bleeding procedure if necessary.
Caution! When bleeding the brake system, it is necessary to constantly monitor the level of brake fluid in the expansion tank so that it does not empty and air does not get into the system again. Never pour brake fluid drained during bleeding into the tank. Also, do not pour brake fluid that has been stored for a long time in an unsealed container.
Pumping with a special device
10. Connect the special bleeding tool hose to the master cylinder.
11. Create a pressure of 2 bar in the system.
12. Attach the transparent hose to the bleed nipple. Place the free end of the transparent hose in a container half filled with brake fluid.
13. Loosen the bleeder screw and press the brake pedal all the way down 5 times to allow the fluid to flow into the container
14. When there are no air bubbles in the flowing liquid, close the bleeding nipple and remove the special device.
15. Check the brake fluid level in the reservoir (it should be between the maximum and minimum marks on the tank).
16. If necessary, repeat the bleeding procedure.