Hyundai Tucson: Troubleshooting

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Brake System / General Information / Troubleshooting

Problem Symptoms Table

Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely cause of the problem.

Check each part in order.

If necessary, replace these parts.



Service Standard

Service Standard

Tightening Torques

Tightening Torques



Special Service

Special Service Tools

Tool (Number and Name)/ Illustration/ Use

09581-11000 Piston expander/ front disc/ Spreading the front disc brake piston

09527 -2W110 Sensor cap installer/ installing wheel/ Used for installing wheel speed sensor cap (Use with 09231-HI 100)

09231 - HI 100 Handle/ Brake System/ (Use with 09527-2W110)

Brake System Bleeding

Nomal Brake System


This work is to be performed by two people.

  • Main worker : Bleeds the system by manually opening and closing the bleed screw and detecting air coming out of brake lines.
  • Assistant: Brake pedal operation and scanner operation inside the vehicle.
  1. Connect the brake fluid filler to the reservoir tank.


  • Do not reuse the drained fluid.
  • Always use genuine DOT4 brake Fluid.

    Using a non-genuine DOT4 brake fluid can cause corrosion and decrease the life of the system.

  • Make sure no dirt or other foreign matter is allowed to contaminate the brake fluid.
  • 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.
  • The reservoir on the master cylinder must be at the MAX (upper) level mark at the start of bleeding procedure and checked after bleeding each brake caliper. Add fluid as required.
  1. Remove the wheel and tire.

    (Refer to Suspension System - "Wheel")

  2. The main worker connects the clear hose to the wheel bleeder screw (A) and sends a signal to assistant to depress the brake pedal.
  3. The assistant ro pump the brake pedal 2 times with normal brake force and then keep the brake pedal depressed.
  4. While the assistant is depressing the brake pedal, remove the bleed screw (A) momentarily to remove the air. and then fasten it again.


The bleed screw opens and closes only a quarter of a turn.


Tightening torque : 6.8 - 12.7 N.m (0.7 - 1.3 kgf.m, 5.0 - 9.4 lb-ft)



Tightening torque : 6.8 - 12.7 N.m (0.7 - 1.3 kgf.m, 5.0 - 9.4 lb-ft)

  1. Repeat the procedure for wheel in the sequence shown below until air bubbles no longer appear in the fluid.


     ESC Bleeding of Brake System

    This procedure should be followed to ensure adequate bleeding of air and filling of the ESC unit, brake lines and master cylinder with brake fluid. Connect the brake fluid filler to the reservoir tank. WARNING Do not reuse the drained f

     Braking System - operation and description

     Operation and Leakage Check

    Inspection Brake Booster (A) (1) Check brake operation by applying the brakes during a test drive. If the brakes do not work properly, check the brake booster. Replace the brake booster as an assembly if it does not work properly or i


     Engine Control Module (ECM)

    ECM Terminal And Input/Output signal ECM Terminal Function Connector A Connector B Engine Control Module (ECM) - Removal Removal Turn ignition switch OFF and disconnect the battery negative (-) terminal

     Diagnostic Procedure Using a Diagnostic

    Instrument The following section describes how to diagnose faults using a diagnostic instrument. Connect the diagnostic instalment to the self-diagnostic connector (16-pin) beneath the crash pad on the side of driver's seat, and then