Kia Rio YB Quiz
Brake System

Brake booster

In this manual: Brake System
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
16steps
~96min
4/5difficulty
0102030405016.712N·mlb·ft
Tightening torque found on this page
Done 0 of 16

Components and Component Location

Components

1. Brake Booster Assembly
2. Reservoir		 3. Master Cylinder

Repair Procedures

Brake Booster Operation Test

To perform a simple check of brake booster operation, carry out the following inspections.

  1. Start the engine, let it run for one to two minutes, then stop it. If the pedal initially falls fully but gradually rises higher in subsequent attempts, the booster is operating normally. If the pedal height remains unchanged, the booster is not operating.

  2. With the engine stopped, depress the brake pedal several times.

    Then depress the brake pedal and start the engine. If the pedal moves slightly downward, the booster is in good condition. If there is no change, the booster is not operating.

  3. With the engine running, depress the brake pedal and stop the engine. Hold the pedal depressed for 30 seconds. If the pedal height does not change, the booster is in good condition. If the pedal rises, the booster is not operating.

    If all three of the above tests are passed, booster performance may be reduced, but it is considered to be in good condition.

    If any one of the three tests above is unsatisfactory, inspect the check valve, vacuum hose, and booster for malfunction.

Removal

  1. Remove the battery and battery tray.

    D 1.4 U2 TCI (Refer to Engine Electrical System - "Battery")

    G 1.0 T-GDI (Refer to Engine Electrical System - "Battery")

    G 1.2 MPI (Refer to Engine Electrical System - "Battery")

    G 1.4 MPI (Refer to Engine Electrical System - "Battery")

  2. Remove the air cleaner assembly.

    D 1.4 U2 TCI (Refer to Engine Mechanical System - "Air Cleaner")

    G 1.0 T-GDI (Refer to Engine Mechanical System - "Air Cleaner")

    G 1.2 MPI (Refer to Engine Mechanical System - "Air Cleaner")

    G 1.4 MPI (Refer to Engine Mechanical System - "Air Cleaner")

  3. Remove the brake fluid from the master cylinder reservoir using a syringe.

  4. Disconnect the brake fluid level switch connector (A) and disconnect the brake tube (B) from the master cylinder by loosening the tube flare nut.

    Tightening torque:

    ABS: 13,7–16.7 N·m

    ESC: 18,6–23 N·m

  5. Remove the master cylinder (B) from the brake booster after loosening the mounting nuts (A).

    Tightening torque: 9.8–15.7 N·m

  6. Remove the airbag lower panel.

    (Refer to Body - "Under Cover Panel")

  7. Remove the lock pin (A) and the flat head pin (B).

  8. Remove the brake booster mounting nuts (A).

    Tightening torque: 16.7–26 N·m

  9. Remove the brake booster after disconnecting the vacuum hose (A) and ISG connector (B).

Inspection

  1. Inspect the check valve in the vacuum hose, the booster, and the connection section.

  2. Check the boot for damage.

Installation

  1. Install in the reverse order of removal.

  2. After installation, bleed the brake system.

    (Refer to Brake System - "Brake System")

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