To remove the Brake Master Cylinder, first disconnect the battery negative terminal. Next, remove the Brake Master Cylinder fluid reservoir cap and siphon the hydraulic fluid from the reservoir, or alternatively, open two bleed screws in the system and gently pump the brake pedal to expel the fluid. Disconnect the wiring connector from the brake fluid level sender unit on the side of the reservoir. Use a brake hose clamp or similar tool to clamp the supply hose to the clutch Brake Master Cylinder, then disconnect the hose from the reservoir. Clean the area around the brake pipe unions on the Brake Master Cylinder, placing absorbent rags beneath to catch any surplus fluid. Note the correct fitted positions of the unions, unscrew the union nuts, and carefully withdraw the pipes, plugging or taping over the ends to minimize fluid loss and prevent dirt entry. Remove the two nuts securing the Brake Master Cylinder to the vacuum servo unit and withdraw the Brake Master Cylinder with the reservoir from the engine compartment. If necessary, tap out the retaining pin and pull the reservoir upwards to release it from the Brake Master Cylinder. For refitting, remove all dirt from the mating surfaces, refit the reservoir to the Brake Master Cylinder ensuring the rubber seals are correctly fitted, and tap in the retaining pin. Fit the Brake Master Cylinder to the servo unit, ensuring the pushrod enters the bore centrally, then refit and tighten the mounting nuts to the specified torque. Place absorbent rags around the Brake Master Cylinder and fill the reservoir with fresh hydraulic fluid. Have an assistant fully depress the brake pedal and hold it while covering the outlet ports on the Brake Master Cylinder body with fingers, then slowly release the brake pedal, repeating until the fluid is free from air bubbles. Clean the brake pipe unions and refit them to the correct ports, tightening the union nuts securely. Refit the clutch supply hose to the reservoir and remove the hose clamp, bleeding the clutch system if necessary. Finally, reconnect the wiring connector to the brake fluid level sender unit and bleed the complete hydraulic system.