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Remove the drain screw of the lower pump and screw in the new drain screw. Use a syringe to suck out all the brake fluid in the pump. After draining all the brake fluid, use a syringe to inject air into the lower pump. 1-2 times to make the oil shiny and the upper pump smooth.
Keep the inside of the lower pump clean. Make sure the upper pump is normal and the lower pump piston is normal.
After adding 50 ml of brake fluid to the syringe, slowly inject the brake fluid. At this time, observe whether there are bubbles when the oil flows out of the upper pump oil tank. If there are bubbles, drain the brake fluid and continue. pumping until there are no more air bubbles in the oil tank.
After the oil tank of the upper pump is full, tighten the oil drain screw of the lower pump.
Press the brake lever continuously until the brake is normal.