Description And Operation

The brake system is equipped with:

• Self-ventilated front disc brakes.
• Floating calipers.
• Dual piston front disc brake calipers.
• Single piston rear disc brake calipers.
• An Antilock Brake System (ABS) assembly that includes a hydraulic control unit, an electronic control unit, hydraulic valves that modulates braking pressure through eight solenoids (two per wheel) and a hydraulic pump.
• Wheel speed sensors are located in the front and rear hub and bearing housings.
• Brake warning lights on the Instrument Panel Cluster (IPC).
• A brake pedal sensor that sends an operating signal to the ABS control unit and also controls the brake lights.

BRAKING SYSTEM 

The standard Electronic Stability Control (ESC) system is a four-channel independent control to all four corners of the vehicle, with a active handling system that links the vehicle dynamic control systems to assist the driver in maintaining control under demanding or adverse conditions. ESC primarily integrates the ABS and Traction Control Systems (TCS) to control all four corners of the vehicle in response to yaw and in relation to steering input. The system algorithm determines when to activate the system based on data from the vehicle sensors: wheel speed, yaw rate, lateral acceleration, master cylinder pressure, steering wheel angle and vehicle velocity.

The system also features:

• Brake/Lock Differential  regulates braking pressure side-to-side on the driven axle to optimize stopping distances and vehicle sway control under all vehicle-loading conditions.
• Traction Control System (TCS)  is integrated with the ABS, also an all-speed, four-channel system. It combines both torque and brake control to regulate wheel spin at all driving speeds and conditions. The system can be turned OFF via a button located on the center console.
• Brake Assist (BA)  senses emergency braking by detecting the speed or force the driver applies to the brake pedal and boosts the power as needed.
• Engine Drag Control (EDC)  senses if there is a difference in speed between the free rolling wheels and the driven wheels. Under these conditions the EDC sends more torque to the driven wheels to ensure all four wheels are spinning at similar speeds, resulting in enhanced stability and vehicle dynamics.
• Trailer Sway Control  detects the trailer moving in one direction, then applies selective brake pressure on the tow vehicle opposite side (called asymmetric braking). This creates counter-moments to the forces applied on the vehicle from the trailer, dampens the motion and helps to reduce the sway.
• Hill Start Assist (HSA)  prevents the vehicle from rolling on an up or down gradient. The system engages automatically when a gradient of five percent or more is detected. It then acts to hold the truck stationary for two seconds after the brake is released, giving the driver time to apply the throttle.
• Rollover Mitigation  determines when a vehicle is experiencing extreme lateral tire force and activates (selected braking forces at the corners of the vehicle) to reduce these forces and reduce the chance of rollover events.
• Automatic Brake Lamp Actuation  senses emergency brake situations earlier than humanly possible (via brake pedal sensing and steering angle positioning) and actuates/flashes the tail lamps.