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Slow brake release — chambers stay applied after pedal release
Western Star 4900 / 5700 / 4700 (Eaton-spec)
Fits both Big Cam and Small Cam 855 configurations
AS-0048-2G
World American WA01-9978C Air Spring | Replaces Mack 8446-S28929 Filtration Slow brake release — chambersThe World American WA01 9978C is a heavy duty rolling lobe air spring engineered for trailer suspensions. Designed as a direct replacement for Mack 8446 S28929, this OEM equivalent spring delivers consistent height control, superior durability, and reliable damping for long haul and vocational trailers. Built to withstand harsh road conditions and heavy loads on highways and back roads. Specifications Category Air Springs Air Bags Part Type Trailer
US$ 20.70
US$ 234.50
US$ 114.50
US$ 35.97
US$ 199.00
US$ 22.50
US$ 26.97
US$ 25.50
US$ 59.97
