Which incorrect service procedure will likely cause brake lock-up?

Adjusting the master cylinder push rod too long can lead to brake lock-up because it can prevent the master cylinder from fully releasing the brake pressure. If the push rod is too long, the piston in the master cylinder may not return to its resting position completely, which means that pressure in the brake system is maintained even when the driver is not pressing the brake pedal. This residual pressure can cause the brakes to remain engaged, leading to a condition where the brakes are effectively locked up, preventing the vehicle from moving freely.

Understanding how each component of the brake system interacts is crucial. A master cylinder that is incorrectly adjusted can have significant effects on brake performance, and ensuring that all settings are precise is essential for safe and reliable braking action. Adjustments should always align with manufacturer specifications to avoid such malfunctions.