From the bottom of the frame, to the center of the axle housing, it is suppose to be 8¾" without a trailer. With the trailer, the measurement should be 8½"
Low air suspension refers to the fifth wheel height from the ground. The suspension system (low air leaf) is a suspension system with a lower ride height and is used by many transportation companies because it allows their truck to hook up to a variety of trailers. In modern days, low air leaf has been replaced with Flex Air suspension (low air leaf is still available). Flex air has the same ride height but weighs several hundred pounds less, thus allowing the truck to haul more weight in the trailer.
According to the Service Manual I have, it's 11.5". This is measured from the top of the rubber spring to the bottom of the aluminum piston of the left hand side of the truck. All others should match.
Check to see if your tires are out of round.
To adjust the Peterbilt Air Trac suspension, first, ensure the vehicle is safely parked and on level ground. Use the air control system to adjust the air pressure in the air bags until they reach the desired ride height, which can generally be found in the vehicle's specifications. Additionally, check for any leaks or issues with the air lines and bags to ensure optimal performance. Always refer to the specific service manual for detailed instructions and specifications related to your model.
To lower a Peterbilt 359, you can adjust the air suspension system by releasing air from the air bags, which will lower the truck's height. Additionally, you might consider installing lowering blocks on the rear suspension or using shorter springs, though this could affect ride quality and handling. Always ensure that any modifications comply with local regulations and maintain safety standards. It's also advisable to consult with a professional mechanic for proper installation and adjustments.
On the air springs.
Peterbilt Flex Air Suspension is an advanced air suspension system designed for heavy-duty trucks, particularly those manufactured by Peterbilt. This system enhances ride quality and stability by utilizing air bags and shock absorbers to effectively manage load distribution and absorb road shocks. It allows for improved cargo handling and a smoother driving experience, especially under varying load conditions. The Flex Air Suspension is particularly beneficial for long-haul trucking, where comfort and vehicle control are crucial.
No it should not. They have a ride height switch, which cycles the compressor. You probably have an air leak in the system.
The air suspension system in a 1994 Lincoln Continental consists of air springs, a compressor, and a height-sensing control system. The air springs replace traditional coil springs, using compressed air to adjust the vehicle's ride height and maintain a smooth ride. The compressor pumps air into the springs as needed, while the height sensors monitor the vehicle's level and adjust accordingly. A diagram would typically illustrate these components and their connections, showing how air flows between the compressor and the air springs.
This is a common mistake, the first animal to ride in a hot air ballon was a gorrila named "Heasman", he was choosen to go up in the hot air balloon due to his height of 3ft 2.
Peterbilt made (and continues to make) a number of different models available for a number of different purposes. They won't all have the same suspension. Construction vehicles would have the option of Camel Back, Hendrickson Walking Beam, or Chalmers Suspensions. Road tractors would most likely have a four bag air ride suspension.
possibly the height sensors came unplugged rear or front but that will dissable the pump.