Disassembly and Reassembly

Disassembly
1. Remove the spring pin.
2. Remove the reserve tank and the reserve tank cap.
The brake fluid level switch is built-in to the reserve tank and cannot be removed.
3. Remove the O-ring.
4. Remove the snap ring.
5. Remove the primary piston assembly.
6. Invert the cylinder body and push on the secondary piston until the pin falls free.
7. Remove the secondary piston assembly.
8. Remove the cylinder body.

Inspection
Excessive brake pedal travel, malfunction or dragging brake suggests that the master cylinder is defective. In such cases perform the following visual check:

Visual Check
Make parts replacement as required if wear, distortion, nicks, cuts, corrosion, or other abnormal conditions are found through the following parts inspection:
^ Master cylinder body
^ Fluid reservoir
^ O-ring
^ Wash each part in brake fluid before beginning the inspection procedure.
^ Check the inside surfaces of the master cylinder for abrasion, corrosion, and other damage. Replace the cylinder if necessary.
^ Check the return port for clogging. Clean the port with a wire and compressed air if necessary.
^ Check the piston and piston cup for abrasion, damage, and wear. Replace the piston assembly if any of these conditions exist.
^ Check the return spring. Replace the spring if it is weak.
^ Check the snap ring. Replace the snap ring if it is stretched or weak.

Reassembly
1. Wash each master cylinder internal part in brake fluid before beginning installation.
2. Install the cylinder body.
3. Press the secondary piston assembly into the cylinder body and hold it. Thread the pin through the long hole of the piston to secure the piston assembly.
4. Install the primary piston assembly.
5. Install the snap ring.
6. Install the O-ring.
7. Install the reserve tank and the reserve tank cap.
8. Install the spring pin.