Hyundai Elantra (CN7): Brake System / Repair procedures

Hyundai Elantra (CN7) 2021-2026 Service Manual / Brake System / 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: Components and components location

    C

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Compressor oil

    Repair procedures Oil Specification1.The HFC-134a system requires synthetic (PAG) compressor oil whereas the R-12 system requires mineral compressor oil. The two oils must never be mixed.2.Compressor (PAG) oil varies according to compressor model. Be sure to use oil specified for the model of compressor.

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