Hydraulic Braking System
WARNING: This page is about a different car, the 2010 Volvo V70, 2009 Volvo V70, and 2008 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Primary Circuit, Secondary Circuit, Master Cylinder And Brake Control Module (BCM)
| Number | Designation | Number | Designation |
| 1 | Primary circuit | 3 | Master cylinder |
| 2 | Secondary circuit | 4 | Brake control module (BCM) |
The hydraulic brake system is a two-circuit diagonal brake system. The hydraulic brake system is divided into a primary and secondary circuits.
The primary circuit (1) includes:
- the rear chamber for the master cylinder
- the cylinder in the front right-hand brake caliper
- the cylinder in the rear left-hand brake caliper.
The secondary circuit (2) includes:
- the front chamber for the master cylinder
- the cylinder in the front left-hand brake caliper
- the cylinder in the rear right-hand brake caliper.
Two cables run from the master cylinder (3) to the brake control module (BCM) (4), where the brake pipes then branch to the wheel brakes.