Hydrocephalus is due to a problem with the flow of the fluid that surrounds the brain. This fluid is called the cerebrospinal fluid, or CSF. The fluid surrounds the brain and spinal cord and helps cushion the brain. CSF normally moves through the brain and the spinal cord and is soaked into the bloodstream. The flow of CSF is blocked.
The Tesla Model S has a collision avoidance assist system that automatically engages the brakes to reduce the impact of a frontal collision. Automatic emergency braking will stop applying the brakes when the driver presses the accelerator pedal, the brake pedal, or sharply turns the steering wheel.
On the vast majority of cars (see Tony Vincent's answer), the parking brake, also called the emergency brake (E-brake) or handbrake, only applies brakes on the rear wheels. Pull it delicately and the car will slow down. But apply enough force (assuming the brake is in good working order) and the rear wheels will lock.