Kia Stonic Quiz
Braking system

brake booster

In this manual: Braking system
General Information — 8Maintenance — 31Engine Mechanical — 49Engine Electrical — 15Emission control system — 11Engine Control System/Fuel System — 45Clutch System — 12Manual Transaxle System — 11DCT (Dual Clutch Transmission) System — 16Drive Shafts and Axles — 9Suspension — 16Steering — 10restraint system — 15Braking system — 22Body (Interior and Exterior) — 89Rear Seat — 16Electrical System — 25Electrochromic Interior Rear View Mirror — 64Heating, Ventilation, and Air Conditioning — 31
14steps
~84min
4/5difficulty
0102030405016.712N·mlb·ft
Tightening torque found on this page
Done 0 of 14

Components and Components Location

COMPONENTS LOCATION

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

repair procedures

BRAKE BOOSTER FUNCTIONAL CHECK

Perform a simple functional check of the brake booster as follows.

  1. Start the engine and let it run for one to two minutes, then stop it. Depress the brake pedal fully at first; on subsequent presses, the pedal should rise higher. If the pedal height remains unchanged, the booster is not functioning properly.

  2. Depress the brake pedal several times with the engine off.

    Then depress the brake pedal and start the engine. Does the pedal move down slightly? If yes, the brake booster is normal. If there is no change, the brake booster is faulty.

  3. Depress the brake pedal with the engine running, then stop the engine. Keep the brake pedal depressed for 30 seconds. If the pedal height does not change, the brake booster is functioning normally. Does the pedal move up? If yes, the brake booster is faulty.

    If all three of the above tests are passed successfully, the brake booster performance is considered good.

    If even one of the three tests described above is not satisfactory, inspect the check valve, vacuum hose, and brake booster for malfunctions.

expansion

  1. Remove the battery and battery tray from the vehicle.

    D 1.6 U2 TCI (Refer to Engine Electrical System - "Battery")

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

    G 1.2 MGI (Refer to Engine Electrical - "Battery")

    G 1.4 MPI (Refer to Section EE - "Battery")

  2. Remove the air cleaner assembly.

    D 1.6 U2 TCI (Refer to Engine Mechanical - "Air Cleaner")

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

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

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

  3. Suck out the brake fluid from the reservoir with a suitable pump/syringe

  4. Disconnect the brake fluid level switch connector (A) and disconnect the brake hose (B) from the master cylinder by loosening the 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 and removing the mounting nuts (A).

    Tightening torque: 9.8~15.7 N·m

  6. Remove the lower instrument panel trim.

    (Refer to Body - "Lower Instrument Panel Trim")

  7. Remove the lock pin (A) and cotter pin (B).

8th.

Remove the brake booster mounting nuts (A).

Tightening torque: 16.7 ~ 26 N·m N·m

  1. Disconnect the vacuum hose (A) and ISG connector (B), then remove the brake booster.

TEST

  1. Check the check valve in the vacuum hose, the booster, and the connection area.

  2. Check the boot for damage.

Installation

  1. Installation is the reverse of removal.

  2. After installation, bleed the brake system.

    (Refer to Brake System - "Brake System")

Test yourself

A quick Kia Stonic quiz: every answer comes with an explanation and a link to the manual page.