Monroe MA728 Air Suspension Shock - Rear

Monroe Max-Air MA728 Rear Air Shock Absorber

The Monroe Max-Air Air Shock Absorber MA728 is built for rear suspension applications that need added support for towing and hauling. It can be inflated or deflated up to 150 PSI to help maintain level ride height when extra weight is carried, with capacity limited by the vehicle’s suspension, tires, and transmission.

Compatible with rear applications on select Cadillac, Isuzu, and Toyota models, including Cadillac DeVille, Fleetwood, Eldorado, Isuzu Pickup, and Toyota Land Cruiser. This Monroe MA728 air shock absorber is a fitment-focused replacement for vehicles that need adjustable rear support under load.

Key Features

• Rear air shock absorber for towing and hauling applications
• Adjustable air pressure up to 150 PSI for ride-height support
• Extended length: 23.375 in.; compressed length: 14.25 in.
• Travel length: 9.125 in.
• Rubber dust shield included to help protect the shock shaft area
• Upper mounting code/type: L1/CP5
• Lower mounting code/type: L1/CP3
• Cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application

Product Details

Monroe Max-Air shock absorbers are part of Monroe’s air-adjustable suspension line, created for vehicles that need rear-end support when carrying cargo, towing, or hauling. The MA728 uses air pressure adjustment to help restore stance and reduce rear sag under load. It is a rear-position air shock absorber with a rubber dust shield and a 9.125-inch travel range, making it a practical replacement for older trucks and classic passenger vehicles with load-leveling needs.

Fits 1981-1995 Isuzu Pickup, rear; Fits 1975-1987 Toyota Land Cruiser, rear; Fits 1971-1974 Toyota Land Cruiser, rear; Fits 1965-1970 Cadillac DeVille, rear; Fits 1966-1970 Cadillac Fleetwood, rear; Fits 1965-1966 Cadillac Eldorado, rear. The Monroe MA728 is also listed for additional rear-fit applications across the same vehicle families.

Common Problems This Part Helps Address

• Rear suspension sag when towing or hauling heavy loads
• Loss of ride height after adding cargo or equipment
• Need for adjustable rear support on older vehicles
• Uneven stance caused by load changes in the rear of the vehicle
• Replacement of a worn rear air shock absorber on supported Cadillac, Isuzu, or Toyota applications

Installation Notes and Tips

Some applications require a separate left and right fill system, and certain vehicles may need an AK18 or AK64 Air Line Kit. For 1971-1974 Toyota Land Cruiser models with chassis # FJ55, use the AK18 Air Line Kit to replace a single air shock fill system if needed, or the AK64 Air Line Kit to add separate left and right air shock fill control. 1966-1970 Cadillac Fleetwood vehicles with rear air leveling systems require the AK16 Adapter Kit. Verify mounting codes, rear position, and vehicle-specific air line requirements before installation.

Quality Assurance

Monroe manufactures the Max-Air line as an adjustable suspension solution for load-carrying rear applications. The MA728 is built to match the listed fitments and mounting codes for the specified Cadillac, Isuzu, and Toyota vehicles.