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Message: [QUOTE="BrewTown, post: 1560170, member: 31811"] They have different circuits front and rear, and a proportioning valve to allocate pressure. When I said traditionally, I should have been more specific and said from disc/drum to disc/disc. On top of that, master cylinders can vary in size pretty dramatically, which changes the pressure ratio (foot to caliper) and volume of fluid moved (affects how far the pedal moves to apply appropriate pressure.) Although I don't know what bore the SD trucks or OBS trucks use, I have seen 3/4" bore to 1 1/4" I believe. I know pedal ratio can be changed as mentioned too, a throw vs. pressure trade-off. All that said, they increased the size of the brakes too for that generation, with '05 F350 bigger than F250 as far as I know. Does that mean they 'tuned' the master along with that change? I don't know but I think there's a great possibility of it. None of this means the OBS one won't work at all, but it most likely won't be optimal. Someone who has actually played with it and tested how it works would be a great resource. I have seen and played with an adjustable proportioning valve to stop the rears from locking before the fronts as a workaround. Never did have great brakes with that set-up. There may have been more going on there though as it's a '34 Plymouth street rod with a Dart 427 SBC, 700R4, Mustang 2 front suspension and 9'rear with Explorer discs. A whole mashup... [/QUOTE]

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