![]() ![]() At temperatures as low as -40☏, the new pistons are 100% functional. This allows the rubber bellows of the air spring to last much longer due to significantly reduced wear as the bellows flexes up and down the smooth piston. #FIRESTON AIRMOUNT PLUS#Compared to conventional steel or aluminum pistons, they are lighter, more impact-resistant, and impervious to atmospheric corrosion, water, salt, and ice-melting chemicals, plus their smooth non-porous surface finish virtually eliminates the buildup of harmful dirt and grit. These pistons are manufactured from a high percentage, glass filled thermosetting resin using stateof-the-art SMC technology. Sometimes extended as a means of attaching the spring to the vehicle suspension.ġ0) Girdle Hoop - A wire-wound ring molded into the bellows to provide lateral stability in convoluted type springs.Ĭomposite Piston - Firestone offers a composite fiberglass reinforced plastic piston into its reversible sleeve Airide springs for bus suspensions. Controls the characteristics of the spring under changing pressure loads.ĩ) Piston Bolt - Attaches the piston to the bellows. ![]() ![]() Natural rubber construction provides functional properties to –65F.ħ) Bumper - A solid rubber or engineered plastic device designed to prevent significant damage to the vehicle or suspension in the event of a sudden loss of air pressure in the spring.Ĩ) Piston - Provides a lower mounting arrangement for the air spring. Allows 100% leakproof testing prior to shipment.Ħ) Bellows - The 'air bag' includes four plies of material: an inner layer, two plies of cord-reinforced fabric, and an outer cover. Provides an air entrance to the bellows.ĥ) Bead Plate - Crimped onto the bellows at the factory for a more durable design and maximum quality control. Provides an alternative mounting system to the stud.Ĥ) Air Fitting - Usually 1/4 N.P.T. Used to attach the spring to the vehicle’s suspension.Ģ) Combo Stud - Serves the dual purpose of mounting the spring to the suspension and providing an entrance for air.ģ) Blind Nut - Also a permanent part of the bead plate assembly.
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