Bailey Moyes 912 Dragonfly, Руководство по обслуживанию

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Since these are disc brakes there is no need for a shuttle valve. When the brake piston starts to move it
covers the reservoir return hole, then starts to add pressure to the system. If the piston does not return
to the full back position, it will not open the reservoir return port. Thus becoming a check valve,
because the fluid pressure from the front brake goes past the Cup Seal on the head of the piston, and
cannot come back the other way because of the Cup Seal shape.
Also the piston retainer snap ring is punched out so it has a rounded side and a square side. The
rounded side has to face the piston so that the square side is holding the piston from coming out. We
have had the piston pop out of the rear master cylinder because the rounded side was trying to hold the
piston in when front brakes are applied. Normally this snap ring is a passive retainer. But the way we
use it, it gets a lot of pressure when the front brakes are applied.
Notes:
Appendix B Page 8 End of Appendix B