If you pull the parking brake while a car is moving at high speed, several things can happen:
Loss of control: Applying the parking brake while the car is in motion can cause an abrupt and uncontrolled change in the vehicle's dynamics. The rear wheels may lock up suddenly, leading to a loss of traction and stability. This can cause the car to skid, spin, or even go into an uncontrollable slide, increasing the risk of a collision or loss of control.
Damage to the parking brake system: The parking brake is not designed to handle the forces generated at high speeds. Engaging it while the car is in motion can put excessive stress on the parking brake system, leading to damage or failure. Components such as cables, levers, or the brake mechanism itself can be damaged, requiring costly repairs.
Strain on the drivetrain: Activating the parking brake while the car is moving can introduce significant strain on the drivetrain components. The sudden application of the parking brake can cause stress on the transmission, differential, or other drivetrain elements, potentially leading to mechanical failures or damages.
Increased risk of accidents: Pulling the parking brake while the car is moving at high speed can surprise and confuse other drivers on the road, potentially causing them to react abruptly or collide with your vehicle. It can also catch other motorists off guard, increasing the risk of a chain reaction accident involving multiple vehicles.
In summary, pulling the parking brake while a car is moving at high speed is extremely dangerous and can result in loss of control, damage to the vehicle, and increased risk of accidents. The parking brake should only be engaged when the vehicle is stationary or at very low speeds to prevent unintended consequences.