2021 Hyundai Brake Caliper Fluid Inspection TSB 20-BR-002H

Hyundai has released Technical Service Bulletin (TSB) 20-BR-002H to address instances where fluid may be observed around the brake caliper area on various 2021 Hyundai models. This bulletin provides a clear procedure for technicians to inspect and accurately identify the type of fluid present, ensuring proper diagnosis and repair. The goal of this Hyundai brake caliper fluid inspection is to differentiate between brake fluid, which indicates a potential leak in the braking system, and assembly oil, which is typically harmless residue from manufacturing.

Symptoms

The primary symptom addressed by TSB 20-BR-002H is the visible presence of fluid around the brake caliper piston area. Owners might notice a greasy or wet residue on or near their vehicle's brake calipers. It is important to investigate any such fluid to determine its origin and potential impact on vehicle safety and performance.

Diagnosis and Fluid Identification

Accurate identification of the fluid is critical for addressing the Hyundai brake caliper fluid inspection concern. The TSB outlines a simple yet effective method to distinguish between brake fluid and assembly oil. Assembly oil is often residual lubricant from the manufacturing process and typically does not pose a safety risk, though it should be cleaned. Brake fluid, however, indicates a leak within the hydraulic braking system, which is a serious safety concern requiring immediate attention.

Repair Procedure Summary

The diagnostic and repair process detailed in Hyundai TSB 20-BR-002H involves a few key steps:

1. Fluid Sample Collection: If fluid is observed around the brake caliper piston area, a technician will carefully collect a small sample using a cotton swab. During this step, it is crucial to "Do not disturb the caliper boot" to avoid introducing new issues or contaminating the sample.
2. Ink Smear Test: To identify the fluid, an ink smear test is performed. Several horizontal lines are drawn on a sheet of paper using an oil- or water-based ink pen. The collected fluid sample is then wiped vertically down these ink lines.
3. Result Interpretation:
   • Assembly Oil: If the ink lines do not smear or run when the fluid is wiped over them, the fluid is likely assembly oil. In this case, the excess oil should be wiped away using a clean shop towel. The TSB reiterates the importance to "Do not disturb the caliper boot" during this cleaning process.
   • Brake Fluid: If the ink lines run or smear significantly, the fluid is identified as brake fluid. This indicates a leak in the braking system that requires further investigation to pinpoint its source and subsequent repair.

This precise Hyundai brake caliper fluid inspection method helps technicians avoid unnecessary repairs and ensures that actual brake fluid leaks are promptly addressed.

Important Warnings for Brake Fluid Leaks

Hyundai TSB 20-BR-002H includes a critical "NOTICE" regarding brake fluid leaks:

"If a fluid leak is found at the banjo bolt area between the brake line and the caliper, replace the copper washers of the banjo fitting. Follow the applicable service manual procedures to replace the washers, bleed the brake system, and inspect for brake fluid leaks."

This emphasizes that any identified brake fluid leak, particularly around the banjo bolt, must be repaired by replacing specific components and properly bleeding the brake system to restore full braking function and safety.

Owner Action

If you own a 2021 Hyundai model such as a Tucson, Veloster, Santa Fe, Kona, Elantra, Venue, Sonata, Accent, or Palisade, and you observe any fluid around your brake calipers, it is important to have your vehicle inspected by a qualified service technician. The Hyundai brake caliper fluid inspection procedure outlined in TSB 20-BR-002H will help determine the nature of the fluid and guide the appropriate repair. This TSB indicates that "Normal warranty applies" to these inspections and any necessary repairs.

This information is based on Hyundai Technical Service Bulletin 20-BR-002H, NHTSA ID 10183963.