Air springs ensure that an air suspension is consistently operating at the correct ride height. Hendrickson uses proprietary air springs designed and tested to deliver optimal performance on our suspension systems in specific applications. Variations in internal bumpers and flexmember bias can affect how much weight is carried by a given amount of air, which could mean a front axle in a tandem weighs out differently from the rear. Ensure optimum suspension performance by using Hendrickson Genuine Parts air springs.