Brake Lines, Attaching To Hydraulic Unit

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.

On the Brake Master Cylinder:

Courtesy of AUDI

A - Master Brake Cylinder Primary Piston Circuit to Hydraulic Unit

- Identification: 6 mm diameter and pipe fitting with a M12 x 1 thread

B - Master Brake Cylinder Secondary Piston Circuit to Hydraulic Unit

- Identification: 6 mm diameter and pipe fitting with a M12 x 1 thread

On the Hydraulic Unit:

Courtesy of AUDI

1 - Hydraulic Unit to Left Front Brake Caliper

- Identification: 5.25 mm diameter and tube fitting with a M10 x 1 thread

2 - Hydraulic Unit to Right Front Brake Caliper

- Identification: 5.25 mm diameter and tube fitting with a M12 x 1 short thread

3 - Hydraulic Unit to Left Rear Brake Caliper

- Identification: 5.25 mm diameter and tube fitting with a M12 x 1 short thread

4 - Hydraulic Unit to Right Rear Brake Caliper

- Identification: 5.25 mm diameter and tube fitting with a M10 x 1 thread

A - Hydraulic Unit to Master Brake Cylinder Primary Piston Circuit

- Identification: 6 mm diameter and pipe fitting with a M12 x 1 thread

B - Hydraulic Unit to Master Brake Cylinder Secondary Piston Circuit

- Identification: 6 mm diameter and pipe fitting with a M12 x 1 thread

Tightening Specification

Refer to OVERVIEW - CONTROL MODULE AND HYDRAULIC UNIT