Cars 1984-89
1. After removing the master cylinder and draining fluid from the tank, remove the outer retaining ring.
2. Remove washer, secondary cap and secondary piston bushing from shaft.
3. Remove the lock bolt. Push the secondary piston assembly (to relieve stress on the seal) and remove the snap ring. Be careful not to scratch or damage the inner wall.
4. Remove the secondary and primary piston assemblies.
5. Remove the screw from the secondary piston assembly; remove the spring.
6. Thoroughly clean all parts with clean brake fluid. Any other cleaner will damage the parts.
For installation:
7. Lubricate new piston assemblies with clean, fresh brake fluid. Install them in the cylinder bore. Installation is easier if the pistons are rotated.
8. Put the cylinder on the shaft and push down on the cylinder, install the stop bolt with a new metal gasket.
9. Turn the cylinder over so that the shaft is on top. Press down on the shaft and install the inner circlip.
10. Install secondary caps, bushing, and outer circlip.
11. Install the seal on the master cylinder flange.
1990-91 Accord and Prelude
The manufacturer does not recommend dismantling the master cylinder. If there is an internal fault, the entire unit must be replaced.