Air Over Hydraulic Brakes Troubleshooting

Bleed system and brakes.

Air over hydraulic brakes troubleshooting.

Dirt is the greatest cause of premature air valve failure. Brakes will not apply. List the major components of an air over hydraulic braking system. Brake hydraulics are a sealed system so there should not be air in the lines but if after service you have a sponge pedal that is the most likely cause.

For air brake compressors this troubleshooting guide obsoletes and supersedes all previous published. Dirt is the greatest cause of premature air valve failure. Bench bleed a master cylinder. A bad master cylinder can introduce air into the lines as can a failure at a caliper or wheel cylinder.

Slowly depress the brake pedal and observe the gauges. City transit bus refuse bulk unloaders low boys. In this article we will go through what an air over hydraulic brake system is. W o air suspension air over hydraulic brakes.

Each cylinder is fitted with a piston and a common rod. Figure 3 47 typical air over. This difference in the two pistons. Describe the operation of a typical hydraulic abs.

Outline some typical maintenance and service procedures performed on hydraulic and air over hydraulic brake systems. The air over hydraulic brake system has an air over hydraulic power cylinder fig. The air piston is of greater diameter than the hydraulic piston. 3 48 that contains an air cylinder and a hydraulic cylinder in tandem.

Printed on recycled paper checklist 2 if there is excessive leakage in the supply side of the pneumatic system one or more. Air brake system troubleshooting 1 before replacing any valve with a new or remanufactured valve be sure to blow the air lines out either using the vehicle s own air supply or shop air. While air over hydraulic brakes might not be the most common technology anymore they are still relevant and thus important to understand. Brakes not bled of air allowing master cylinder to bottom.

Identify the methods used to bleed brakes. Reservoir located below master cylinder restricting oil flow. In fact a good understanding of air over hydraulics is important not only because of the necessary maintenance and upkeep ut also in case you re thinking of a replacement.