Because to actuate the brake you pull at the brake lever.
Because bicycle brakes use levers. There's one lever at the handlebar, and for all but hydraulic brakes either the brake itself consists of levers or a lever is used to make the brake pads engage.
Bicycle brakes are usually levers
the handlebars are a first class lever. the fulcrum (the balance point) is in the middle.
What the brake lever does is that it use the action of the rider pulling on the lever into a force that can be used to slow the wheel(s) down by generating friction.
Well, the lever will apply a force to a linkage, connecting the lever to the actual brake. Then the force will travel through the linkage, down to the brake. In the brake, the force will be used to pinch a moving surface between two stationary surfaces, and the friction generated there will slow the bike down.
Generally a parking brake system would be the parking brake lever (either a hand activated lever with a ratcheting lock and release lever, or a foot brake pedal with a ratcheting mechanism that releases when pushed to its maximum.), cables continuing from the parking brake lever to the rear drums, and the parts inside of the standard rear drum brake that are activated by pulling the cables. This system is used to prevent a car from moving when parked on an incline, or to prevent the transmission from jamming in Park which can happen when towing a load or parking a heavy vehicle on a hill.
It has many parts that work together to preform a function. Just like other comples machinesIt's got wheels, axles, levers and gear ratios.Because it consists of many simple machines.A bicycle is built up of several simple machines, (the lever, wheel and axle etc), and several simple machines interacting becomes a compound machine.
Pedal.
yes
No, the regular brake system is a hydraulic system that is actuated when the driver depresses the brake pedal. The emergency brake is a direct mechanical system that is manually actuated when the driver pulls the hand lever or depresses the emergency brake pedal, which is separate from the brake pedal.
On an s-cam air brake, it's the slack adjuster. The brake valve could also be considered one.
Yes