Master Cylinder
Components and Component Location
Components

| 1. Reservoir Cap 2. Reservoir |
3. Master Cylinder 4. Brake Fluid Level Sensor |
Repair Procedures
Removal
Turn the ignition switch OFF and disconnect the negative (-) battery cable.
Remove the air cleaner assembly.
G 2.0 NU MPI (Refer to Engine Mechanical System — "Air Cleaner")
G 2.5 GDI THETA II (Refer to Engine Mechanical System — "Air Cleaner")
Disconnect the brake fluid level sensor connector (A).

Remove the brake fluid from the master cylinder reservoir using a syringe.
Disconnect the brake tube (A) from the master cylinder by loosening the tube flare nut.
Tightening torque: 18.6 – 23 N·m

Remove the master cylinder (A) after loosening the master cylinder nuts.
Tightening Torque: 9.8–15.7 N·m

Separate the reservoir from the master cylinder after removing the screw (A).
Tightening torque: 0.98–1.5 N·m

Installation
Install in the reverse order of removal.
After installation, bleed the brake system.
(Refer to Brake System - "Brake Bleeding Procedures")
Check for brake fluid leakage and pedal condition.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.