Bleeding the hydraulic brake system.
Before bleeding the hydraulic brakes, it is important to:
- replenish the fluid in the master cylinder to the required level,
- unscrew or remove the plug of the venting screw located above the conduit and supplying the fluid to the hydraulic cylinder. Screw into the bleed screw instead of the plug (the bleed valve) a rubber or plastic tube and immerse its free end in a poured brake fluid, e.g.. into a glass vessel.
Bleeding the system should start from the wheel furthest from the master cylinder, and ending with the nearest circle. During bleeding, you must constantly refill the fluid in the master cylinder reservoir. Under no circumstances should all the fluid be pumped out of the pump. Also, do not depress the brake pedal, when at least one of the brake drums is removed, as the fluid pressure will push the expander pistons and the fluid will overflow.