Just a 'for info'; many transport aircraft (737, BAe146 to name but a few) use the landing gear UP hyd pressure to operate an auxiliary set of pistons (146 anyway) on the brake units. Usually operation of the gear handle also disables the anti skid to allow the brakes to work.
After a 146 brake change, it's gear pins IN, hydraulics on, then gear UP to check for leaks. I always dread that 'clack clack' as the downlocks release and the gear actuators try to break the gear pins!
Last edited by itsresidualmate; 28th Oct 2012 at 21:40.