Ranger 2WD L4-140 2.3L SOHC (1984)
Brake Master Cylinder: Service and Repair
Rebuild
THIS ARTICLE INCLUDES CHANGES MADE BY TSB #83-19-14 DATED SEPTEMBER 1983
Master Cylinder
DISASSEMBLY
1. Clean the outside of the master cylinder and remove the filler cover and diaphragm, Drain and discard any brake fluid that remains in the cylinder.
Removing Snap Ring
2. Depress the primary piston and remove snap ring from retaining groove at the rear of the master cylinder bore.
3. Remove primary piston assembly from the master cylinder bore and inspect for seal damage or twisting. Discard piston assembly.
4. Remove the secondary piston assembly by directing compressed air into the outlet port at the blind end of the bore while plugging the other outlet
port. Inspect for seal damage or twisting. Discard piston assembly.
5. Inspect the master cylinder bore for signs of etching, pitting, scoring or other damage.
a. If bore is damaged, discard and replace with new master cylinder assembly.
NOTICE: Do not attempt to hone bore.
b. If bore is not damaged, rebuild master cylinder assembly using the proper repair kit and the procedure outlined below.
ASSEMBLY
1. Clean the master cylinder body with clean isopropyl alcohol or brake parts cleaner to remove any contamination.
2. Dip the repair kit piston assemblies in clean DOT 3 brake fluid to lubricate seals.
3. Carefully insert the complete secondary piston assembly in the master cylinder bore.
4. Carefully insert the primary piston assembly in the master cylinder bore.
