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Gigglepin Motor Brake System (MBS) is a fully controllable air operated braking system that mounts in between the winch housing and the motor (i.e in front of the motor), and is suitable for any winch/motors fitted with the multi-splined output shaft (Armature shaft). This includes Warn 8274, GP winches and many lowline winches also.
https://gigglepin4x4.net/the-gigglepin-mbs---motor-brake-system-1571-p.asp