quote:Originally posted by Bosswrench:
...If the shuttle is stuck at one end of it's bore, fluid flow is severely restricted to that pair of calipers..Many safety-related articles over the years expand on all the above.
I know the schematic shown is generic, but I don't see the flow being restricted sense there are the through passage is blocked with the reduced diameter and thus fluid goes around.
After saying this, I did find an online photo of the spool removed and it is differernt. I would like to see the internals myself, but it looks as if the right side spool would slide into the removalable end cap and THAT could provide a significant fluid block. I then assumed one side does need to be blocked when a leak occurs since the master cylinder has a floating front piston and required rear piston pressure to provide force to the front piston.
BUT, looking at the tubing arrangement, the rear MC piston discharge goes to the removalbe end cap and thus if the shuttle failed to the right, appling rear MC pressure would push the spool back and allow fluid out the leak.
Would this be more accurate?
