What happens to a hydraulic system when a trailer is attached?

When a trailer is attached to a hydraulic braking system, the system experiences increased demand as it needs to handle the additional weight and braking force. This can lead to a scenario where the current brake fluid might not be sufficient to maintain optimal pressure, especially if the trailer has its own braking system that operates in conjunction with the vehicle's system. If the hydraulic system experiences a significant drop in pressure due to the added load, it may create a situation where brake fluid could be pushed out or lost, particularly if there are existing leaks or weaknesses in the system.

The hydraulic system utilizing brake fluid is designed to transmit force; with the increased load from a trailer, this creates a strain that could potentially lead to brake fluid leakage or the need for more fluid to maintain proper function. Understanding this dynamic is crucial for ensuring safety when towing and highlights the importance of maintaining the hydraulic braking system to accommodate additional loads.