The Borg Warner 310mm LU (A618, 47RH/RE, 48RE) piston damper cores are becoming scarce. After several rebuilds, the material supporting the friction material becomes weak, and deflection could result in failure. The Sonnax fully machined piston allows for a stronger and more durable replacement. The hardened bore reduces galling of the seal bore. Sonnax piston plate BW-DA-3P adapts to the OE damper assembly using BW-RV-2 rivets.

Machined from a steel billet
Increased wall thickness for greater stiffness
Hardened bore to reduce galling
Lockup surface machined to specific requirements for bonding

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