Brake Master Cylinder: Service and Repair

WITH POWER BRAKES

1. With engine off, depress brake pedal to expel vacuum from brake booster system.
2. Disconnect hydraulic lines from master cylinder.
3. Remove brake booster to master cylinder retaining nuts and remove master cylinder from brake booster.
4. Reverse procedure to install and perform system brake bleeding procedures, then refill master cylinder and bleed it.

LESS POWER BRAKES

1. Disconnect wires from stop light switch inside cab below instrument panel.
2. Remove retaining nut, shoulder bolt and spacers which secure master cylinder pushrod to brake pedal assembly, then remove stop light switch from pedal.
3. Disconnect hydraulic brake lines from master cylinder, then remove master cylinder to dash panel retaining nuts, master cylinder, and boot from master cylinder pushrod.
4. Reverse procedure to install and perform system brake bleeding procedures, then refill and bleed master cylinder.