The control subsystem of a vehicle consists of the brakes and steering system. When not functioning properly, brakes may fail to stop the vehicle in time, while issues with the steering system can lead to loss of control. These malfunctions compromise the driver's ability to control the vehicle, creating hazardous driving conditions.

Additionally, the control subsystem also includes the electronic stability control (ESC) system, which helps to prevent skidding and loss of control in slippery or windy conditions. If the ESC system malfunctions, it can increase the risk of accidents on the road.

Regular maintenance and inspections of the control subsystem components are crucial to ensure the vehicle's safe operation. Any signs of brake or steering system issues should be addressed promptly by a qualified mechanic to prevent potential accidents and ensure the safety of both the driver and other road users.