Why Won't My Car Stop When I Push the Brakes?

If you're experiencing issues with your car's brakes, it can be a cause for concern. When your car doesn't stop as expected, it might be due to several underlying issues. This article will help you diagnose and understand the possible causes, so you can take appropriate action.

Common Causes of Brake Failure

There are numerous reasons why your car might be unable to stop properly when you push the brakes. Some of the most common issues include:

Brake Fluid Leak

If there is a leak in the brake lines or the master cylinder, it can cause a reduction in brake fluid pressure. This can lead to reduced braking performance and potentially complete brake failure.

Worn Brake Pads

Worn-out brake pads may not generate enough friction to effectively stop the vehicle. When the pads wear down too much, they lose their ability to grip the rotors and slows down the car.

Damaged Brake Lines

Corrosion or damage to the brake lines can impede the flow of brake fluid, leading to a decrease in braking power.

Malfunctioning Brake Booster

If the brake booster is not functioning, it can impair the power assist for the brakes, making it harder to stop the car with the pedal.

Air in the Brake Lines

Trapped air in the brake lines can prevent the brakes from engaging properly. This can make the pedal feel spongy or lead to reduced braking power.

Faulty Master Cylinder

A failing master cylinder may not produce the necessary pressure to stop the car. This component is crucial for generating the hydraulic pressure required to activate the brakes.

ABS Issues

If your vehicle has an Anti-lock Braking System (ABS), a malfunction in this system could cause braking problems. ABS helps to prevent the wheels from locking up during emergency braking, so a malfunction can severely impact your car's ability to stop safely.

Additional Factors to Consider

Several other factors can contribute to failing brake performance:

Old Brake Fluid

Brake fluid can absorb moisture from the atmosphere, leading to a decrease in its boiling point. If the boiling point is too low, the fluid can boil when braking, resulting in a very soft brake pedal. Consult a mechanic to check the brake fluid level and condition.

Contaminated Brake Fluid

Contaminated brake fluid can also lead to reduced braking performance. Ensure that your brake fluid is clean and free from contaminants.

Friction Material Issues

If the brake pads or shoes are worn out, they will not generate enough friction to stop the car. These components typically produce noise when they are worn down, allowing you to identify the issue.

Brake Calipers

Seized or damaged brake calipers can impede the effectiveness of the brakes. Environmental factors such as pollution, road salt, and sand can cause calipers to seize, leading to a hard brake pedal.

Including more information about your specific situation can help a mechanic diagnose the issue more accurately. For instance, if your brake fluid is old or contaminated, or if your tires are bald and in poor condition, these factors can also contribute to brake performance issues.

It's crucial to stop driving the vehicle immediately and have it inspected by a qualified mechanic to ensure your safety and prevent accidents.