The Hendrickson Brake Chamber, part number S-40878-2 or S408782, is a genuine Hendrickson component designed for Hen 3 suspension applications. Hendrickson suspension systems are common across heavy-duty trucks and trailers, and using the correct OEM brake chamber helps maintain proper braking function at the axle. Pro Gear and Transmission carries this part for buyers who need to match the original Hendrickson specification. If you need to confirm this is the right chamber for your suspension configuration, give us a call before ordering.FeaturesGenuine Hendrickson OEM brake chamberPart number S-40878-2 or S408782Designed for Hendrickson Hen 3 suspension applicationsSold by Pro Gear and Transmission