Is It Bad to Drive with the Emergency Brake On?

In today's world of automotive maintenance and road safety, drivers often wonder about the impact of using the emergency brake (e-brake) during regular driving. While it might seem like a simple solution for keeping the vehicle stationary or preventing it from rolling, there are several downsides and potential risks involved in such a practice. Let's delve into the consequences and explore why it's generally not recommended to drive with the e-brake engaged.

Understanding the Emergency Brake

The emergency brake, often referred to as the handbrake, serves as a backup to the regular braking system. It is designed to be used in emergencies, such as an unexpected stop in traffic or a sudden loss of regular braking power. However, many drivers might engage the e-brake unintentionally, perhaps because of its proximity to the roadside or in an attempt to prevent the vehicle from rolling.

Common Consequences of Driving with the E-Brake On

Potential for Excessive Wear on Rear Brakes: One of the most common and concerning issues with consistently using the e-brake is the accelerated wear on the rear brakes. This can happen, especially on highways, where the car is moving at high speeds. The e-brake's engagement causes the rear brakes to work harder than necessary, leading to excess heat and wear. This can significantly impact the lifespan and performance of your vehicle's braking system.

Heat-related Wear and Warping: High-speed driving with the e-brake on can cause the rear brakes to get very hot. As the brakes overheat, the brake rotors or drums may start to warp. Warped brake components can lead to issues like pulsating brake pedals, which can be unsafe and difficult to manage. Warped brakes also require more frequent maintenance and can become more expensive to fix over time.

Short-term and Long-term Implications

Slower Speed and Possible Safety Concerns: If you are going slightly slower while driving with the e-brake engaged, this might seem safe, but it could also be a sign that your rear brakes are not functioning at full capacity. Any reduction in speed due to e-brake engagement can be a temporary measure, but it does not address the underlying issue of worn or overheated brakes. In the long term, this can lead to brake failure, which is a significant safety concern.

Reduced Brake Performance and Fluid Boil: Over time, the excessive use of the e-brake can lead to temperature build-up in the braking system. This heat can cause the brake fluid to boil, especially at high speeds where the system is working harder. When this happens, the stopping power of the brakes is drastically reduced, posing a serious risk in emergency situations. A boiling brake fluid can also lead to brake fade, which is a critical threat to road safety.

Preventive Measures and Recommendations

To ensure the safety and longevity of your vehicle, it is recommended to use the emergency brake only in emergencies and not as a substitute for regular parking or braking. If you find yourself unintentionally engaging the e-brake during normal driving, it might be worth checking the adjustment or consult with a professional mechanic to address any issues with your braking system.

Conclusion: While the emergency brake can be a useful tool, it should not be relied upon as a regular substitute for your regular braking system. Engaging it during normal driving can lead to excessive wear and heat-related issues, ultimately affecting the performance and safety of your vehicle. Always adhere to proper brake maintenance practices and use the e-brake only in genuine emergencies.