The brake system hydraulic fluid should be changed regularly in accordance with the vehicle's routine maintenance schedule. The procedures for changing the brake fluid and bleeding the hydraulic system are very similar in order of execution, taking into account the points noted in the text.
The hydraulic path of the brake system is equipped with several bleeding valves. Thus, the valves are located on the brake calipers and wheel cylinders. In addition, some models are equipped with an additional bleeding valve installed on the pressure regulator valve.
1. Fill the brake master cylinder reservoir with clean brake fluid and keep it at least half full throughout the bleeding procedure.
Note: If you need to change the brake fluid, drain it from the reservoir, wipe the inner walls of the reservoir with a clean, lint-free cloth and fill with fresh fluid.
2. Connect a piece of clear hose to the left rear bleeder valve (on the wheel cylinder) or to the valve of the pressure regulator valve (if equipped). Place the opposite end of the hose in a transparent container partially filled with clean brake fluid.
3. Press the brake pedal several times, lock it in the lower position and unscrew the valve. Tighten the valve and slowly release the pedal. Repeat the procedure until the liquid free of air bubbles starts to come out of the hose.
Note: If the fluid has been changed, continue bleeding until clean, fresh fluid begins to flow from the hose.
Attention! To avoid air getting into the system again, do not allow the brake fluid in the master cylinder reservoir to drop below half the level during bleeding, top it up periodically. Fluid drained from the system cannot be reused - use only fresh fluid for topping up.
4. Repeat the procedure for the remaining bleeder valves.
5. After bleeding is complete, the brake pedal should be pressed with firm resistance without any signs of softness. Check that all bleed valves are tightly tightened.
6. Add the required amount of fresh brake fluid to the master cylinder reservoir, bringing its level to normal.