Hyundai Tucson LM Quiz
Brake System

Brake Booster Repair Procedures

In this manual: Brake System
General Information — 1Engine Mechanical System — 44Engine Electrical System — 45Emission Control System — 24Engine Control System/Fuel System — 93Clutch System — 13Manual Transmission — 18Automatic Transmission — 87Four-Wheel Drive (4WD) System — 26Drive Shaft and Axle — 29Suspension System — 35Steering — 20Restraints — 47Brake System — 36Body (Interior and Exterior) — 53Body Electrical System — 202Heating, Ventilation, and Air Conditioning — 58
16steps
~96min
4/5difficulty
0102030405025.519N·mlb·ft
Tightening torque found on this page
Done 0 of 16

Brake Booster Operational Test

To perform a simple check of brake booster operation, carry out the following inspections.
  1. Start the engine for one or two minutes, then stop it. If the pedal depresses fully the first time but gradually rises when depressed again, the booster is operating properly. 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 down slightly, 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, then 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 the previous three tests were performed normally, booster performance can be judged as good. Even if one of the three tests above is not satisfactory, inspect the check valve, vacuum hose, and booster for malfunction.

Removal

  1. Turn the ignition switch OFF and disconnect the negative (-) battery cable.
  2. Disconnect the positive (+) battery terminal, then remove the battery.
  3. Disconnect the ECM connector, then remove the ECM and battery tray.
  4. Disconnect the vacuum hose (A) from the brake booster. [LHD]
    [Right-hand drive]
  5. Remove the master cylinder. (Refer to Master Cylinder)
  6. Remove the lock pin (A) and the flat head pin (B).
  7. Remove the mounting nuts.

    Tightening torque: 16.7 ~ 26 N·m

  8. Remove the brake booster.

Inspection

  1. Inspect the check valve in the vacuum hose.
    Do not remove the check valve from the vacuum hose.
  2. Check the boot for damage.

Installation

  1. Installation is the reverse of removal.
    • Before installing the pin, apply grease to the clevis pin.
    • When installing, use a new clip.
  2. Adjust the brake pedal height and free play. (Refer to Brake Pedal Height and Free Travel Adjustment)
  3. After installation, bleed the brake system. (Refer to Brake System Bleeding)

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