System Overview: Introduction

Brake control system Mark 25E1 

The Mark 25E1 brake control system with the brake control module (BCM) is an electronic control system that prevents wheel lock-up during braking (ABS). Preventing wheel lock-up makes it possible to maintain steering control and maximize braking effect.

The brake control system comprises: 

• Anti-lock Braking System (ABS)
• Electrical Brake force Distribution (EBD) at the rear wheel brakes.
• Dynamic Stability and Traction Control system (DSTC)
• Emergency Brake Assistance (EBA)

The Mark 25E1 brake system also includes a number of functions to assist the driver in various braking situations. 

• The brake system pressurization  function fills the brake system with brake fluid, which minimizes the distance between the brake disc and brake pad.
• The hydraulic pump activation  function helps the brake system increase brake pressure by activating the hydraulic pump when the vacuum pressure from the brake servo is insufficient.

Other vehicle systems can send a request to the Mark 25E1 brake control system to activate certain other brake functions. The following control modules can request brake function from the brake control module (BCM):

• Forward sensing module (FSM).  The system uses a forward-aimed radar that detects whether there are any objects within a predefined area in front of the vehicle while driving. If the system registers any object or obstacle, a request is sent to the brake control module (BCM) to decelerate the vehicle.
• Park brake module (PBM).  The system is an electrically operated parking brake. If the driver activates the parking brake while driving, the park brake module (PBM) requests the braking function from the brake control module (BCM).
• Closing velocity module (CVM) (XC60 and S60 (11-)).  The system uses a forward-sensing lidar, works like a radar but uses light instead of electromagnetic waves, which during travel at low speeds below senses if an object is within a predefined area in front of the vehicle. If the system registers any object or obstruction, a request is sent to Brake control module (BCM) to brake the vehicle.