ABS Control Module Found on vehicles with ABS brakes, the module performs diagnostic checks of the ABS braking system and determines when to send the correct pressure to each wheel to prevent the wheels from locking up.
Brake Booster Reduces the amount of pressure needed for braking to allow any driver to operate the brakes.
Uses engine vacuum and pressure to increase the force the brake pedal puts on the master cylinder. Disc Brakes Usually found on the front wheels, disc brakes feature brake pads that press against a disc rotor when the brake pedal is applied to stop the vehicle. The pads are attached to a brake caliper assembly that frames the rotor. Drum Brakes Located on the rear of the vehicle, drum brakes feature wheel cylinders, brake shoes and a brake drum.
When the brake pedal is pressed, the brake shoes are forced into the brake drum by the wheel cylinders, bringing the vehicle to a stop. This action forces the outer brake pad against the rotor. The fixed caliper design has one or more pistons mounted on each side of the rotor. When the brakes are applied, only the caliper pistons move, pressing the brake pads against the disc. When they are used it is only on the rear axle. Instead of a caliper that clamps brake pads against a rotor, a drum brake system has a wheel cylinder with pistons that push brake shoes out against the inside of a spinning drum.
This contact slows and stops the rotation of the brake drum and the wheel. Although they both operate with the same basic hydraulics, the two types of brakes perform differently.
Disc brakes are more efficient, provide better stopping power, dissipate heat easier and work better in wet conditions, all while being less complex. Some base models have disc on the front axle and drum on the rear, to keep costs down. In these models, why are disc put on the front and drum on the rear? A typical, unloaded vehicle is already about 10 percent heavier in front due to the engine. Then when you hit the brakes, the weight of the car transfers to the front. More braking power is needed there, making it a job for disc brakes.
Stopping power. Disc brakes apply more braking force faster, resulting in shorter stopping distances. Heat management. Since they are exposed to air, disc brakes cool better.
This can cause brake fade, a loss of stopping power when friction material overheats. Wet performance. Disc brakes perform better in wet conditions because they are open to the air and can sling water off easily. Plus, the rotors get dried by the pads dragging across them. When water gets inside a drum brake it tends to get trapped inside the drum, so it takes longer for the friction material to dry out.
Emergency brake. This feature is easier to install on a drum brake than to a caliper or inside the hub of a disc brake rotor. Disc brakes are self-cleaning.
Drum brakes are closed and are prone to brake dust collecting from the shoes, so they need periodic cleaning. Drum brakes have more hardware and can be more complex to service. Additionally, almost all vehicles come with emergency brakes and anti-lock brakes. Disc brakes consist of a brake rotor which is attached directly to the wheel.
Hydraulic pressure from the master cylinder causes a caliper which holds the brake pads just outside the rotor to squeeze the brake pads on either side of the rotor. The friction between the pads and the rotor causes the vehicle to slow and stop. A ratchet on the handbrake lever keeps the brake on once it is applied. A push button disengages the ratchet and frees the lever. The Video Course teaches you everything about modern cars. Dual-circuit braking system.
For this reason, the rear brakes are deliberately made less powerful than the front. Such systems apply and release the brakes in rapid succession to stop them locking. Many cars also have power assistance to reduce the effort needed to apply the brakes. There may be more than a single pair of pistons, especially in dual-circuit brakes.
In either type, return springs pull the shoes back a short way when the brakes are released. On drum brakes, the handbrake system presses the brake linings against the drums.
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A car uses quite a lot of electricity to work the ignition and other electrical equipment. To make an engine start it must be turned at some speed, so that it sucks fuel and air into the cylinders , and compresses it. A car engine produces a lot of heat when it is running, and must be cooled continuously to avoid engine damage.
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