Up until mid 2000 WRV used a floating Brake Caliber, the pins which the caliber slides on were to be lubed at regular intervals. Sometime in 2000 WRV went to a fixed caliber on all Alpines. Unfortunately the floating calibers would bind and cause the brakes on the one caliber to over heat.
I believe the recall involves replacing the calibers with a fixed caliber.
Disc brake calibers work on applying pressure on both sides of the disc and stopping the vehicle. A floating caliber has as piston(s) on one side and applies pressure on one side of the caliber and because they float the caliber pulls the opposite brake pad to the disc causing both pads to make contact with the disc. Most automobiles manufactured use a floating caliber design. A fixed caliber has pistons on both sides and applies pressure to the pads without moving.
Contact WRV with your serial number (Last five digits) and they can tell you if your Alpine needs the update or if it has been completed.