In a hydraulic system, the pressure delivered by the various wheel cylinders is directly affected by the areas of their pistons. For example, if one wheel-cylinder piston has an area of 2 square ...

Here's what you'd probably notice. Following one or more brake applications, which draws down reservoir pressure, air fails to pump back up. (Normal compressor cut-in pressure is about 105 psi.) ...

We also explain how the spring brake system acts as a fail-safe in case of air pressure loss. This video covers everything from the mechanical components to the benefits of air brakes in emergency ...