Keep the master cylinder reservoir filled in order to keep air out of the hydraulic system. Do not overfill the reservoir. The fluid will expand due to heat from the brakes and the engine.

Clean the reservoir caps before opening the caps in order to keep out dirt. Add brake fluid to the reservoir until the brake fluid is even with the bottom of the filler neck or within 6-13 mm (1/4-1/2 in) of the top of the master cylinder reservoir.