A vehicle has a frame, a straddle seat, front right and left wheels, a rear wheel, a steering assembly, a motor, front right and left brakes, a rear brake, and an electronic brake control unit. The electronic brake control unit has a pump, a valve box and an electronic controller. The electronic controller is electronically connected to the pump, and valves of the valve box for controlling their operation. A hand brake lever actuates a first master cylinder and thereby actuates the front brakes through the valve box. A foot brake lever actuates a second master cylinder and thereby actuates the rear brake through the valve box.

A vehicle includes front suspension assemblies; rear suspension assemblies; a left driven wheel and a right driven wheel with first left and right brake assemblies; a left wheel and a right wheel with second left and right brake assemblies; an anti-lock braking system (ABS) module; a drive mode coupler connected between the transmission and the left and right wheels for changing between a 24 and a 44 drive configuration; and a drive mode switch for controlling the drive mode coupler, the ABS module selectively performing brake traction control of at least one wheel based on the position of the drive mode switch. A method for controlling traction of the vehicle includes sensing the drive mode switch position and when the drive mode changes from a 24 position to a 44 position, causing the ABS module to perform brake traction control on at least one wheel.

A vehicle has a frame, a straddle seat, front right and left wheels, a rear wheel, a steering assembly, a motor, front right and left brakes, a rear brake, and an electronic brake control unit. The electronic brake control unit has a pump, a valve box, a first pressure sensor disposed in the valve box and an electronic controller. The electronic controller is electronically connected to the pump, and valves of the valve box for controlling their operation. A hand brake lever actuates a first master cylinder and thereby actuates the front brakes through the valve box. A foot brake lever actuates a second master cylinder and thereby actuates the rear brake through the valve box. A second pressure sensor is disposed externally of the valve box. The first and second pressure sensors sensing fluid pressure applied by the first and second master cylinders respectively.

Methods and systems are provided for operating a hybrid vehicle during operating conditions where vehicle braking is requested. In one example, regenerative braking is allocated to vehicle wheels responsive to actual and estimated vehicle yaw. Additionally, friction braking torque is allocated to vehicle wheels responsive to requested braking torque and regenerative braking torques.

A method for operating a hydraulic motor vehicle brake system with an anti-lock brake system having a plurality of brake cylinders associated with the wheels to be braked. A central pressure generating device generates a hydraulic brake pressure, wherein the hydraulic brake pressure is distributed to the brake cylinders and may be selectively modified for individual brake cylinders or a group of brake cylinders. The hydraulic brake pressure maintained at a level exceeding an estimated brake pressure limit of each wheel.

A vehicle includes an electric machine and a controller. The controller is programmed to responsive to a threshold difference, indicative of wheel slip, between average wheel speed and a vehicle speed that is based on a difference between wheel acceleration and measured vehicle acceleration, command a speed to the electric machine to reduce the wheel slip.

A vehicle includes front suspension assemblies; rear suspension assemblies; a left driven wheel and a right driven wheel with first left and right brake assemblies; a left wheel and a right wheel with second left and right brake assemblies; an anti-lock braking system (ABS) module; a drive mode coupler connected between the transmission and the left and right wheels for changing between a 24 and a 44 drive configuration; and a drive mode switch for controlling the drive mode coupler, the ABS module selectively performing brake traction control of at least one wheel based on the position of the drive mode switch. A method for controlling traction of the vehicle includes sensing the drive mode switch position and when the drive mode changes from a 24 position to a 44 position, causing the ABS module to perform brake traction control on at least one wheel.

A vehicle includes an all-wheel-drive powertrain having an electric machine configured to power wheels. A controller is programmed to output a first calculated vehicle speed derived from integrating a measured longitudinal acceleration of the vehicle and output a second calculated vehicle speed based on the measured longitudinal acceleration and a speed of one of the wheels. The controller is further programmed to, responsive to a flag being present, command a speed to the electric machine that is based on the first vehicle speed to reduce wheel slip, and responsive to a flag not being present, command a speed to the electric machine that is based on the second vehicle speed to reduce wheel slip.

Methods and systems are provided for operating a hybrid vehicle during operating conditions where vehicle braking is requested. In one example, regenerative braking is allocated to vehicle wheels responsive to actual and estimated vehicle yaw. Additionally, friction braking torque is allocated to vehicle wheels responsive to requested braking torque and regenerative braking torques.

An off-road vehicle has two front wheels and two rear wheels, the rear wheels being connected to a spool gear driven by a motor. The vehicle also has a left front brake, a right front brake and a single rear brake. Speeds of left and right front wheels are respectively monitored by left and right front speed sensors. A single sensor monitors a common speed of left and right rear wheels. Two user actuated braking input devices, for example a hand lever and a foot lever, may be used independently or concurrently to provide a braking command. An anti-lock braking system may use speed measurements from the various speed sensors to control selective application of pressure on the left front brake, the right front brake and the rear brake.