Rigid Brake Line (Brake Master Cylinder – ABS/ESP Unit) – 4K1614706AA

Original rigid brake line (metal pressure line supplying the ABS/ESP hydraulic control unit from the brake master cylinder / brake force booster), designed for Audi A7 Sportback (4K / 4K8 generation) and Audi A6 C8 (4K2 / 4K5 / 4KA type) vehicles based on the modular longitudinal MLBevo platform.

Original VAG brake system component. Made of precision-bent, seamless high-pressure steel tubing with a multi-layer anti-corrosion coating (zinc-polymer), resistant to the aggressive action of DOT 4 / DOT 5.1 brake fluid, extreme engine compartment temperatures, road salt, and moisture. It is responsible for the precise transfer of operating pressure between the brake master cylinder and the ABS/ESP hydraulic control unit without any hydraulic losses or susceptibility to pressure expansion.

Technical specifications:

• Catalog part number (OE): 4K1614706AA / 4K1 614 706 AA (interchangeable with series numbers 4K1614706, 4K1614706S)

• System / Category: Hydraulic brake system (Brake Piping / Hydraulic Lines)

• Function: Rigid pressure line from the brake master cylinder to the ABS unit (Brake Pipe Master Cylinder to ABS Unit)

• Ends / Fittings: Original metal barrel nuts with metric thread and factory-formed sealing crimps (funnel / mushroom)

• Material: Pressure-rated steel protected by an anti-corrosion coating

• Installation side: Engine compartment – left side (windshield base / longitudinal beam area, between the master cylinder and the ABS unit)

• Steering side: Left (LHD – European version, code designation 4K1)

• Condition: Original used part (100% functional, leak-free, unobstructed, without bends, without deformation of the tube cross-section, threads on the fittings in perfect condition, no corrosion)

• Manufacturer: Audi AG / VAG (OEM Original)

Main applications:

• Audi:

  • A7 Sportback (4K8 type) – model years 2018 to 2026 (all TFSI and TDI engine versions – LHD versions with left-hand steering)

  • S7 / RS7 Sportback (4K8 type) – model years 2019 to 2026

  • A6 / A6 Avant / Allroad (4K2 / 4K5 / 4KA - C8 type) – model years 2018 to 2026

  • S6 / RS6 Avant (4K - C8 type) – model years 2019 to 2026

Fitment guarantee and VIN verification

Every line undergoes a check for obstruction, thread condition, and absence of deformation before shipping.

Fitment / installation note: The initial designation 4K1 indicates dedication to vehicles with left-hand steering (LHD – European version). The lines connecting the brake master cylinder to the ABS unit feature factory-designed loops that dampen powertrain and subframe vibrations. Installing the original OEM part guarantees seating in the factory clips and fasteners without the need for bending and without the risk of rubbing against bodywork elements. Before purchasing, we recommend comparing the full OE number with the index (AA) on the old tube or verifying compatibility using the vehicle's VIN.