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The brake pedal will require modulation, as the goal is to allow the rear tires to spin while holding the car in place with the front wheels remaining motionless. At a certain point of balance, the front brakes will prevent the car from moving forward while the rear brakes will have insufficient grip to keep the wheels from spinning, since ...
For example, it can be useful to use less distribution on the rear brakes when entering the corner in order to stabilize the car, and progressively increase the rear-brake distribution as the apex approaches. [7] On Formula One cars, the amount of brake migration can be adjusted using a rotary switch on the steering wheel.
In order to park by using the primary hydraulic brakes, a hand-operated valve is added to lock hydraulic pressure in the brake line. [5] For parking using the brakes on all four wheels, two valves may be necessary. Any leakage at the brake cylinders will reduce pressure in the line and release the brakes.
In a normal turn, rear wheels follow the front ones because resistance to motion in the forward direction (in which the wheels turn) is significantly less than in the sideways direction. The latter provides the centripetal force that makes the rear end of the car follow the turn. When the driver locks the rear wheels with the handbrake, both ...
The parking brake would ensure the car is secure, should another vehicle come into physical contact from behind, causing the car to jolt forward. [15] It is not recommended to use the parking brake when the vehicle is in-motion, unless there is a problem with the main brakes, as this can lock the back wheels and cause a skid. [16]
(The pedal on the left is the parking brake). In modern cars the four-wheel braking system is controlled by a pedal to the left of the accelerator pedal. There is usually also a parking brake which operates the rear brakes only (or less commonly, the front brakes only, as in the Saab 99 and in the Citroën Xantia).
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