What can result from applying the full brakes without releasing the parking brakes first?

When the full brakes are applied without first releasing the parking brakes, it can create a significant risk of brake failure or damage. The parking brakes are typically designed to hold the vehicle stationary and are not meant to be engaged while the vehicle is in motion or when full brakes are applied. This situation can lead to overheating of the brakes due to excessive friction, potentially causing premature wear or even failure of braking components such as the brake pads, rotors, or hydraulic system.

In more severe cases, the sustained pressure and heat can lead to brake fade, where the brakes lose their effectiveness. Thus, applying the full brakes while the parking brakes are still engaged is not only dangerous but can also result in costly repairs and compromised safety. Understanding the correct sequence of engaging and disengaging brakes is crucial for safe vehicle operation.