Air Brake Practice Test

Can you use the parking brake when the brakes are really hot?

1. Yes

2. No

3. Only under certain conditions

4. Only with a temperature gauge

The correct answer is: No

Using the parking brake when the brakes are really hot is generally not advisable due to the risk of brake components being damaged. When brakes overheat, the heat can affect the brake fluid and the brake pads, potentially leading to brake fade or even failure. The assumption with hot brakes is that they are already at a temperature that can cause components to warp or suffer from heat-related issues. Engaging the parking brake while the service brakes are excessively hot can exacerbate these problems, as it puts additional pressure on the brake system while it is already compromised by high temperatures. The parking brake is typically designed to hold a stationary vehicle securely when it is not in motion, and it does this by applying the brakes differently than the service brakes do. In a situation where the service brakes are extremely hot, engaging the parking brake can trap heat and create a risk of materials melting or warping, which could potentially lead to malfunction. Therefore, it is essential to avoid using the parking brake in conditions where the service brakes are hot to prevent unnecessary damage and ensure the overall safety and functionality of the braking system.