If your Defender is not fitted with ABS then this kit doubles up on your braking performance by enabling fitment of the larger brake servo fitted to Defenders with ABS brakes.  The ABS brake servo is around twice the size of the standard brake booster and significantly improves braking. The adaptor ring is anodised and supplied with a better master to servo seal than standard and new fixings. Available on its own or with a new brake servo, please select which brake servo you require - either Lucas TRW or LOF Brakes - both are double diaphragm servos suitable to use with this kit.