For repairing, you first need to identify the master cylinder and the reservoir, besides identifying the fluid lines and the other components. Remove the cap of the brake fluid reservoir, so as to get rid of the old brake fluid. Once you have removed the brake fluid, refill the cylinder and reinstall the cap. You also need to remove the electrical lines, which connect to the sensor of the fluid level. Moreover, you also need to remove the safety clips before you can remove the whole of the cylinder.