Jiaozuo brake

The structure and function of handbrake and foot brake are different, and handbrake can replace foot brake in dangerous situations.

What is the difference between handbrake and footbrake?

① The foot brake is a four wheel brake

The professional name of foot brake is service brake (referred to as foot brake later), which can control four wheels.

Early braking systems would distribute this braking force to the front and rear wheels, with the front wheels distributing 70% of the braking force and the rear wheels only distributing 30% of the braking force.

But there is a problem with this. If a tire blows out, the distributed braking force will become useless, and braking will become difficult.

So later on, EBD (Electronic Brake Force Distribution Device) appeared in cars. At the moment of braking, the driving computer would collect the force difference between the four tires and calculate the appropriate braking force at high speed. Then adjust the braking device to apply different forces to the four tires according to the set procedure, so as to match the braking force with the friction force (traction force) to ensure the stability and safety of the vehicle.

② The handbrake is the rear wheel brake

The professional name for handbrake is parking brake (referred to as handbrake), which generally only applies brakes to the rear wheels.

For most light cars, the handbrake uses the lever principle to pull the brake cable (the electronic handbrake just turns this cable into an electrical signal) to lock the rear brake shoe or caliper (this is like the pliers clamp patch. The tighter the clamp, the better the braking effect).

Light and medium-sized trucks and off-road vehicles use mechanical means to lock the brake drum on the transmission shaft to achieve braking purposes. (This brake drum feels like a Wall plug. It is stuck from the inside to the outside.)

Heavy trucks and large passenger cars often have spring energy storage brakes in their rear brake chambers. When driving, compressed air lifts the springs. When parking, the driver only needs to operate a valve switch to release the air, and the springs will lock the rear wheels. So the handbrake is used to brake the rear wheels (this is very similar to when I was a child catching birds in a washbasin, using a rope to pull out the chopsticks, and the birds were covered under the washbasin. Here, the chopsticks are like air, and the washbasin is like braking).

Can you use a handbrake instead of a foot brake?

① Hand brake cannot replace foot brake

The hand brake and foot brake functions are different and cannot be replaced in general

Actually, you can tell their differences based on their names. The service brake is used to slow down a vehicle when it has speed, while the parking brake is used to keep the vehicle stationary after it has stopped. As mentioned earlier, the handbrake can only control two rear wheels. When studying subject one, the textbook explained a phenomenon: when the rear wheels of a vehicle lock up while driving (the wheels do not turn and are "dragged" away), the vehicle will "spin", causing the "rear wheels to lock up" is also the reason why the handbrake can "drift".

When the brake suddenly breaks down while the vehicle is driving, the vehicle can be braked by pulling the handbrake. However, when pulling on the handbrake, it is important to be careful not to pull it all down or too fast, as this can easily cause damage to the handbrake and malfunction, and the car may also lose control. The correct approach should be to slowly apply force, slowly pull the handbrake to the end, and then, appropriately move back and forth, slowly pull and release, without causing the rear wheels to lock up instantly;

Moreover, when the vehicle speed is high (greater than 40km/h), it is necessary to promptly try to use a forced downshift method to slow down the vehicle, wait for the speed to decrease, and then use the handbrake to slowly stop the vehicle. The braking force of applying the handbrake is much smaller than that of applying the brake. It must be emphasized that when vehicles are driving at high speeds, they must not forcefully apply the mechanical handbrake, which is basically equivalent to "seeking death".

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