What could be the consequence of pushing the brake pedal down when the spring brakes are on?

The consequence of pushing the brake pedal down when the spring brakes are on is that it could damage the brakes with the combined forces of the springs and the air pressure.

Spring brakes are a type of brake system used in air brake systems of commercial vehicles. They are designed to automatically engage and apply the brakes when there is a loss of air pressure in the system. This ensures that the vehicle remains in a stopped or parked position even if there is an air system failure.

When the spring brakes are engaged, pushing the brake pedal down will apply additional force to the already engaged brakes. This can lead to excessive pressure on the brake components and potentially cause damage, such as brake shoe wear, overheating, or even brake failure.