Yamaha GTS1000 ABS pump units are very expensive, and apparently are similar to the FJ1100 units. Info on stripping them down is available on the internet, but I started from a unit that had been bought as bits, and stored in the loft. The sole reason for stripping the unit down was to investigate the O ring sizes, so that the units could be serviced like any other brake part, rather than be replaced. Read More...