Brakes

A vehicle’s braking system is a critical safety mechanism that converts kinetic energy into thermal energy to slow or stop the car. It uses hydraulic pressure and friction through a series of interconnected mechanical and fluid components.

Control & Hydraulics

• Brake Pedal: The driver’s input device; pressing it initiates the braking sequence.
• Brake Booster: Uses engine vacuum or pressure to multiply the force applied to the brake pedal, making it easier to stop the car.
• Master Cylinder: Converts the mechanical force from the pedal into hydraulic pressure by pushing brake fluid through the system.
• Brake Lines and Hoses: Metal tubing and flexible rubber hoses that carry the pressurized brake fluid from the master cylinder to each wheel.

Disc Brakes ( common on front and some rear wheels)

• Brake Caliper: A hydraulic clamp that houses the brake pads and pistons. When fluid pressure builds up, the caliper squeezes the pads against the rotor.
• Brake Pads: High-friction materials that physically press against the rotor. They are subjected to intense friction and heat, meaning they must be replaced periodically.
• Brake Rotors (Discs): Metal discs bolted to the wheel hub that spin along with the tire. The squeezing action of the brake pads on the rotor slows and ultimately stops the wheels from turning.

Drum Brakes (common on some rear wheels)

• Brake Drum: A rotating metal drum attached to the wheel. Unlike a rotor, the pads stop the wheel from the inside of the drum.
• Brake Shoes: Curved pieces of metal coated in friction material that are forced outward to press against the inside of the brake drum.
• Wheel Cylinders: Hydraulic mechanisms inside the drum that push the brake shoes outward when you press the pedal.

Electronic & Safety Features

• Anti-Lock Braking System (ABS): Prevents the wheels from locking up or skidding during emergency braking. It modulates brake pressure much faster than a human could.
• Emergency/Parking Brake: An independent mechanical cable system that bypasses the hydraulic setup, designed primarily to keep the vehicle from rolling when parked.

Common Brake Issues & Symptoms

• Grinding Noise: Metal-to-metal contact between the worn pad backing plate and the brake rotor. This requires immediate replacement of both parts. [1, 2]
• Squealing or Screeching: Indicates that the friction material on the brake pads has worn down, exposing the built-in metal wear indicator. [1]
• Mushy or Soft Pedal: The brake pedal feels unusually soft, sinking low to the floor. This points to air in the brake lines, moisture, or a leak in the master cylinder.
• Steering Wheel Shaking: Vibrations or pulsing felt through the steering wheel or brake pedal when stopping, usually caused by warped or unevenly worn brake rotors.
• Pulling to One Side: The vehicle drifts to the left or right when braking, which is a symptom of uneven pad wear or a sticking brake caliper.
• Burning Smell: A sharp, chemical odor after repeated braking. This indicates brake fade or a seized caliper.

Maintaining your vehicle’s brakes is critical for safety. If you are experiencing any of these issues or symptons schedule with KBG for a brake diagnostic test today. Let’s get those brakes fixed up and keep you safe.