AIR SYSTEM Air Gauges and Air Leaks Do not use penetrating oil, brake fluid, or wax-based oils in the air sys- tem. These fluids may cause severe damage to air system components. CAUTION Your vehicle comes with air pressure gauges for two separate systems, Primary and Secondary: the Primary gauge indicates pressure in the rear braking system; the Secondary gauge indicates pressure in the front braking system. Each gauge indicates the amount of air pressure in pounds per square inch (psi). If the light and alarm do not turn off at start-up, do not try to drive the vehicle until the problem is found and fixed.
If the pressure in either or both systems is too low for normal brake operation, i.e., the pointer of one gauge falls below 65 psi (448 kPa), a warning light on the gauge will glow and the audible alarm will sound. Maintain the air compressor to prevent excessive oil bypass. Replace worn seals in valves and air motors as they are needed. Your authorized dealer carries rebuild kits for most units. NOTE WARNING! Park brakes lock up at 60 psi (414 kPa), the audible alarm will sound at 65 psi (448 kPa). Do not operate the vehicle if leak- age in the air system is detected.
Conduct the following procedure and contact an authorized dealer (or any other properly equipped service center) if a leak is detected. Failure to check the brakes or follow these procedures could cause a system failure, increasing the risk of an accident and may result in death, personal injury, equipment or prop- erty damage. 5 Primary Air Pressure Gauge (03/17) Y53-6077-1B1 5-63