The automotive brake system has been refined and has become extremely dependable and efficient. Typical brake system consists of disk brakes in front and either disk or drum brakes in the rear connected by a system of tubes and hoses that link the brake at each wheel to the master cylinder.
Other systems that are connected with the brake system include: parking brakes, hydraulic lines, power booster and ABS the Anti-Lock system.
Disc brakes assembly
Disc brakes converts the forward motion of the vehicle into heat, the friction surfaces of the pads on a disk brake system, or the shoes on a drum brake convert the forward motion of the vehicle into heat. Heat is what causes the friction surface lining of the pads or shoes to eventually wear out.
The lifespan of the brake components depends of the type of pads and rotors, and of the driving habit. Cars manufactures and mechanics agree that brake pads typically last approximately 30,000 miles / 48,000 km. On average brake pads have to be replaced every 2 years, for city driving. Brake rotors can last quite a bit longer, as much as 3 times as long as pads.
Hydraulic brakes system
A typical brake system consists of disk brakes in front and either disk or drum brakes in the rear connected by a system of tubes and hoses that link the brake at each wheel to the master cylinder.
When the driver step on the brake pedal, he is actually pushing against a plunger in the master cylinder, which forces brake fluid through a series of tubes and hoses to the braking unit at each wheel.
• Disk Brakes (at front and rear) fluid from the master cylinder is forced into a caliper where it presses against a piston. The piston squeezes two brake pads against the rotor which is attached to the wheel, forcing the vehicle to slow down or stop.
• Drum Brakes (at rear) fluid is forced into the cylinder, which pushes the brake shoes out so that the friction linings are pressed against the drum, attached to the wheel, causing the vehicle to slow down or stop.
Hydraulics Brakes pros & cons:
• Very dependable and efficient
• Easy replacement and maintenance
• Broadly used
• Long response time
• Vibration, roughness and fraction noises
• Heavy weight, typical ABS disc brake system weighs approximately 80 kg (included: discs, calipers, brake pads, power booster, hydraulic master cylinder, ABS hydraulic control unit)
• Require power booster
• Require maintenance and periodic parts replacement
• Relatively short lifespan of the brake linings. Pads typically last 30,000 miles / 48 000 km on average, have to be replaced every 2 years
• Pollution, brake pads wear contributes to non-exhaust air pollution, airborne brake wear particles have been recognized as dangerous for human health.