Hyundai Elantra (CN7): Brake System / Repair procedures

Operation and Leakage Check
Component
Procedure
Brake Booster (A)
Apply the brake and check its operation during the test run. If it does not work properly, replace the brake booster. If the brake fluid is found inside the booster when disassembling, replace the booster and master cylinder.
Piston cup and pressure cup inspection (B)
•
Apply the brake and check its operation. See if there is any damage or an oil leakage. If it does not work properly or damaged or an oil leak is found, replace the master cylinder. If the brake fluid is found inside the booster, replace the booster too.
•
Check if there is any difference in brake stroke when it is applied quickly and slowly. If a difference is detected, replace the master cylinder.
Brake hoses (C)
See if there is any damage or an oil leakage. If there is any damage or an oil leak is found, replace the brake hose and washer with new components.
Caliper piston seal and piston boots
•
Apply the brake and check its operation.
•
If the brake pedal does not work properly, it means there is a brake-slip or damage or an oil leak. Replace the brake caliper with a new one.

Brake System (Judder Inspection)

    Components and components location Components1. Reservoir cap2. Reservoir3. Brake fluid lever sensor4. Master cylinder5. Brake booster6. Push road Repair procedures Brake Booster Operating Test1.

    Other information:

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Start/Stop Button

    Components and components location Component Repair procedures Removal1.Disconnect the negative(-) battery terminal.2.Remove the AVN Head unit.(Refer to Body Electrical System - "AVN(Audio Video Navigation) head unit")3.Loosen the mounting screws and remove the start/stop button (A).

    Hyundai Elantra (CN7) 2021-2026 Service Manual: PM Sensor

    Description and operation DiscriptionMonitor the air quality inside the vehicle in real time (PM sensor) and display the status on the screen.Automatically operate when fine dust concentration is high (Condition: Bet mode + A/C ON + 3rd speed or higher) Components and components location Components Location1.

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