Recommendation. Brake fluid is very hygroscopic (absorbs moisture from the air), which, in addition to the appearance of corrosion of parts of the brake system, lowers the boiling point of the liquid itself, and this can lead to brake failure during frequent heavy braking. Therefore, we recommend changing the brake fluid at least once every 2 years.
Before changing the brake fluid, check the tightness of the hydraulic drive (see «Checking the tightness of the hydraulic drive of the brakes») and troubleshoot.
You will need: piping wrench «for 8», brake fluid, rubber or transparent hose, transparent container.
Recommendations. It is recommended to replace the brake fluid with an assistant, having previously installed the car on an inspection ditch, overpass or lift (no need to remove wheels).
Use DOT-4 brake fluid.
The sequence of fluid replacement in the brake mechanisms:
- - rear right;
- - front left;
- - rear left;
- - front right.
Attention! Do not reuse the fluid drained from the system: it is contaminated, saturated with air and moisture. Always add only new fluid of the brand that was previously filled into the system.
Brake fluid is hygroscopic (absorbs moisture from the surrounding air), so it can not be stored in an open container.
Protect the environment! Do not pour used brake fluid into the soil or sewer system. Contact your local authorities for the location of waste fluid collection points in your area.
1. Turn away a stopper of a reservoir of the main brake cylinder.
2. Add clean brake fluid to the reservoir up to the lower edge of the filler neck.
Attention! Brake the vehicle with the parking brake and place wheel chocks under the rear wheels («shoes»).
3. Clean the air release valves from dirt and remove the protective caps of the front wheel cylinder valves...
4....and rear brakes.
5. Fit the rubber hose to the right rear brake bleed valve and immerse the end of the hose in a clean, clear container.
6. The assistant should sharply depress the brake pedal four to five times (with an interval between pressing 1–2 s), and then keep the pedal depressed.
7. Loosen the air release valve 1/2 to 3/4 turn. The old one will start to flow out of the hose (dirty) brake fluid. The brake pedal at this time should smoothly reach the stop. As soon as the fluid stops flowing, close the air release valve.
Note. Constantly monitor the fluid level in the tank, preventing it from dropping to the mark «MIN» on the wall of the tank. Top up with new brake fluid as needed to prevent air from entering the hydraulic drive. This ensures that the old liquid is gradually replaced by the new one without draining the hydraulic system.
8. In the same way, replace the brake fluid in the left front brake mechanism.
9. Replace the liquid in the second circuit in the same way (first in the left rear brake, then in the right front).
10. Repeat steps 5-7 until the fluid in the drive is completely replaced (clear fluid without air bubbles should flow from the hose).
11. After changing the brake fluid, be sure to put on protective caps on the air release valves.
12. Add brake fluid to the level between the marks «MIN» and «MAX» on the wall of the tank. Close the tank cap.
13. Check the quality of the work done: press the brake pedal several times - the pedal stroke and the force on it should be the same each time you press it. If not, go back to steps 5-9.
14. Install the parts in the reverse order of removal.