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Hyundai Equus: Master Cylinder Repair procedures - Brake System - Brake System - Hyundai Equus VI 2009-2025 Service ManualHyundai Equus: Master Cylinder Repair procedures

Second generation VI (2009–2025) / Hyundai Equus VI 2009-2025 Service Manual / Brake System / Brake System / Master Cylinder Repair procedures

Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the cover.
3.
Disconnect the ECM connector (A) and TCM connector (B). And then take the protector of control harness off.

4.
Remove the ECM & TCM bracket installation bolts (C) and nut (D).
5.
Disconnect the brake fluid level switch connector (A) from the reservoir.

6.
Remove the brake fluid from the master cylinder reservoir with a syringe.
   
•
Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.
7.
Disconnect the brake tube (B) from the master cylinder by loosening the tube flare nut.
Tightening torque :
18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m , 13.7 ~ 16.7 lb-ft)

8.
Remove the master cylinder (B) from the brake booster after loosening the mounting nuts (C).
Tightening torque :
12.7 ~ 16.7 N.m (1.3 ~ 1.7 kgf.m, 9.4 ~ 12.3 lb-ft)

Disassembly
1.
Remove the reservoir cap and drain the brake fluid into a suitable container.
2.
Remove the reservoir (C) from the master cylinder (B), after remove mounting screw (A).

3.
Remove the retainer ring (A) by using the snap ring pliers.
4.
Remove the primary piston assembly (B).
5.
Remove the pin (D) with the secondary piston (C) pushed completely using a screwdriver. Remove the secondary piston assembly (C).

   
Do not disassemble the primary and secondary piston assembly.
Inspection
1.
Check the master cylinder bore for rust or scratching.
2.
Check the master cylinder for wear or damage. If necessary, clean or replace the cylinder.
   
•
If the cylinder bore is damaged, replace the master cylinder assembly.
•
Wash the contaminated parts in alcohol.
Reassembly
1.
Apply genuine brake fluid to the rubber parts of the cylinder kit and grommets.
2.
Carefully insert the springs and pistons in the proper direction.
3.
Press the secondary piston (C) with a screwdriver and install the cylinder pin (D).

4.
Install the retainer ring (A) after installing primary piston assembly (B).
5.
Mount two grommets (D).

6.
Install the reservoir (C) on the cylinder (B), and then install the mounting screw (A).
Installation
1.
Installation is the reverse of removal.
2.
After installation, bleed the brake system.
(Refer to Brake System - "Brake System Bleeding")
    Master Cylinder Components and Components Location
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