In the end we changed only one wheel on the Starboard undercarriage and cleaned and inspected the braking system. With a complex multi-piston hydraulic system (same as Vulcan B2) leaks and weeps inparticular are going to happen especially, as she is not in daily use. Weeps can be lived with, leaks cannot.
The Stb'd braking system is extremely dry as regards fluid loss and did not require much apart from a good look-over. The Port side required a little more attention.
The main reason I deferred removing the brake unit is the fact that it takes pints and pints of OM-15 hydraulic fluid to bleed the air out until the fluid runs clear. Its a messy job but must be done 100% because any air left, in particularly the maxaret 'anti-skid unit', will render the brakes likely to grab and flat-spot or blow a tyre, an expensive mistake and also likely to un-impress any airfield manager!
I have bled all of XL231's brakes previously after we replaced every hydraulic wheel cylinder seal and I enjoyed it not one bit!
Incidentally we are LOOKING for replacement mainwheel tyres, cuurently we have several spares but, there are 16 on the aircraft, it is the same wheel and tyres as a Vulcan B2, any leads or help would be appreciated.