Hydraulic failure in the brake system

The brake system uses fluid to transfer the motion of the pedal to the activation of the brakes. A hydraulic failure occurs when this motion is not transferred. The most likely cause is a loss of brake fluid.

Table of Contents

• 1. Symptoms
  • 1.1 Brake Pedal Easy to Press
  • 1.2 Brakes Don't Engage
• 2. Causes
  • 2.1 Brake Fluid Leak

Symptoms

Brake Pedal Easy to Press

The brake pedal is the driver input mechanism for activating the movement of fluid through the brake system. The pedal experiences resistance as the fluid is compressed and pressure increases. If there is a reduction in the fluid, the pedal will experience less resistance and be easy to push.

Brakes Don't Engage

As the brake fluid is forced through the system, the brakes activate to stop the wheels. If this process is stopped, the brakes will not have enough pressure to stop the wheels.

Causes

Brake Fluid Leak

Since the brake system is operated by fluid pressure, if fluid has been lost, there will be a reduction in performance. Brake fluid can leak from many places such as the master cylinder or brake lines.

See brake fluid leaking.