Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Brake Master Cylinder: Technical Service Bulletins
Brake Master Cylinder - Rebuilding Procedure
Article No. 83-19-14
BRAKE MASTER CYLINDERS - REBUILDING PROCEDURE
LIGHT TRUCKS 1981-84 ALL LIGHT TRUCKS
Rebuilding of brake master cylinders during the vehicle warranty period for the subject vehicles has been authorized. Service kits (Base Part Number
2004) are now available for all light truck series vehicles. The following procedure is recommended for rebuilding:
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.
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. Record condition of piston assembly on
service order and discard 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. Record condition of piston assembly on service order and discard 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. Do not attempt to hone bore.
b.
If bore is not damaged, rebuild master cylinder assembly using the proper service kit and the procedure outlined below.
ASSEMBLY
1.
Clean the master cylinder body with clean isopropyl alcohol to remove any contamination.
2.
Dip the service kit piston assemblies in clean brake fluid (ESA-M6C25-A) 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.
5.
Depress the primary piston and install the snap ring in the cylinder bore groove.
6.
On manual brake vehicles, install the push rod retainer onto the push rod and install into the primary piston. Make sure the retainer is properly
seated and holding the push rod securely.
7.
Install the cover and gasket on the master cylinder assembly and secure into position with the retainer.
OTHER APPLICABLE ARTICLES: 80-21-14
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION/TIME: Refer to the Labor Time Standards Manual for applicable operation and time.
DLR. CODING: Basic Part No. 2004 Code: 53
