The HFM BM57 Master Cylinder features a 17/16 inch (27mm) piston bore size and is suited to both ABS and Non-ABS setups. Perfect for if you intend to increase your braking performance and reduce that spongy pedal, giving a shorter, firmer pedal. Vehicle Compatibility Nissan Z32 300ZX Nissan 180sx Nissan S13 Silvia Nissan S14 Silvia Nissan S15 Silvia Nissan Skyline R32 Nissan Skyline R33 Nissan Skyline R34 The product is suited for RHD models specifically, however we do also offer a LHD specific version. NOTE: If you have ABS you will need to block the middle port with the provided tapered grub screw.