Sistema de Frenos del Automóvil Partes (FRENOS DE DISCO Y TAMBOR)

Understanding the Automotive Brake System

Section Overview

This section provides a comprehensive overview of the automotive brake system, emphasizing its importance for road safety and detailing its components and functioning.

Importance of the Brake System

• The brake system is crucial for vehicle safety, as highlighted by regulations set by authorities in various countries regarding braking distance and stability.

• Manufacturers continuously strive to develop safer and more durable brake systems to enhance overall vehicle performance.

Components of the Brake System

• The brake system allows for speed reduction or complete stop of a moving vehicle through energy transformation, converting mechanical energy into heat via friction when the brake pedal is pressed.

• There are two main types of brakes:

• Service Brakes: Operated by the driver using a pedal to slow down or stop the vehicle.

• Parking Brakes: Designed to keep the car stationary when parked, applying sufficient force to lock the wheels.

Types of Brake Actuation

• Brake systems can be activated in three basic ways:

1. Hydraulic: Utilizes liquid pressure.

2. Pneumatic: Employs compressed air.

3. Manual: Engaged through a steel cable.

• Modern vehicles predominantly use hydraulic braking systems due to their efficiency and reliability.

Hydraulic Brake Functionality

• According to Pascal's principle, pressing the brake pedal generates force that is transmitted through a small piston within a cylinder, creating pressure in the brake fluid that acts on larger pistons at each wheel, amplifying force effectively.

• The hydraulic system consists of both primary and auxiliary circuits; primary includes command elements while auxiliary refers specifically to handbrake mechanisms.

Key Components in Detail

• The Servo-brake enhances braking power by utilizing vacuum pressure; it multiplies foot force applied on the pedal before reaching the braking mechanism. This involves an internal piston dividing two chambers under different pressures which increases effectiveness during braking actions.

• The Brake Pump, typically made from lightweight alloy steel, contains cylinders connected with reservoirs for fluid communication with both servo-brake and hydraulic circuit; modern designs often feature dual pistons for improved functionality and reliability during operation.

Circuit Design & Fluid Characteristics

• Each vehicle has dual hydraulic circuits ensuring redundancy; if one fails (e.g., due to a broken line), only two wheels will lose braking capability instead of all four, enhancing safety measures significantly during emergencies. Circuits are arranged diagonally across front and rear wheels for balanced performance under failure conditions.

• Brake fluid must withstand high temperatures with elevated boiling points while maintaining low freezing points (below -40°C) alongside possessing excellent lubricating properties with minimal viscosity changes over temperature variations for optimal performance throughout diverse driving conditions.

Disc Brakes Overview

How Do Different Brake Systems Work?

This section provides an overview of various brake systems, including disc brakes, drum brakes, and anti-lock braking systems (ABS), explaining their mechanisms and functionalities.

Disc Brakes

• The use of nodular cast iron and laminar graphite in disc brakes ensures a long lifespan. When the brake pedal is pressed, a hydraulic pump activates, directing brake fluid to the calipers.

• The pressure from the brake fluid pushes pistons that press the brake pads against the disc, converting kinetic energy into heat and allowing for gradual deceleration of the vehicle.

Drum Brakes

• Drum brakes utilize friction between a shoe (made of cast iron or steel with special friction material) and a cylindrical metal drum attached to the wheel to stop or hold the vehicle stationary.

• As the vehicle starts moving, the drum rotates with the wheel; pressing the brake pedal causes shoes to be pushed against this rotating drum, creating friction that halts motion.

Handbrake System

• The handbrake operates mechanically on rear wheels via rods or cables controlled by a lever inside the car. This system amplifies braking pressure while compensating for movement differences in rods.

Anti-lock Braking System (ABS)

• ABS prevents wheel lock-up during braking, maintaining optimal deceleration while keeping steering control intact. It allows drivers to steer while applying brakes effectively.

• Each wheel has a revolution sensor connected to an electronic control unit that monitors wheel speed. If one wheel slows down disproportionately compared to others, it detects potential locking.

• The system automatically reduces hydraulic pressure on that specific wheel's brake circuit to prevent skidding while still allowing effective braking.