With the pressure the Plymouth brake line and hoses supply the brake calipers and wheel cylinders, your vehicle will have the ability to stop the forward momentum when you desire it. These hydraulic conduits are made to hold in high pressures so the hydraulic fluid can be used as a means to move metal pistons and create the friction that brings your Plymouth to a control stop. It is true all Plymouth owners like to go fast, but unless they can stop their vehicle that enjoyment will be short lived. The brake lines and hoses are attached to the brake master cylinder so this mechanical motion that generates the hydraulic pressure can be transported to where it can be used: the wheel assemblies. This is a closed loop system that must remain closed for it to operate as designed. If the brake hose has even a small pin hole in it, the pressure being generated by the brake master cylinder will be depleted before its full force can reach the brake assemblies. Not only does hydraulic fluid leak out of a hole in the brake hoses, but when the pressure is released by the driver from the brake pedal air will enter this system. This has a negative effect on the stopping power of your Plymouth. Air compresses while hydraulic fluid does not. If air is in your brake lines or hoses, the brake pedal will be softer and the stopping potential of your brake system will be significantly reduced. If a leak is found in any of the Plymouth brake lines or hoses that failing component has to be replaced or the passengers in the vehicle could be in danger.