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Here's what I've learned in the last 2 weeks about F350 brakes. There is a Ford TSB on the master cylinder for F250 and F350, '92-'97. The OEM mc does not have enough volume to operate the front dual piston calipers after the truck gets some age and wear on it. The OEM mc was a 1 1/8" ID bore, the new one is a 1 1/4" ID, so you can push more fluid and get brakes before the pedal almost bottoms out. The OEM in a Cardone reman# is 10-2690, the updated mc, also cardone reman, is 10-2828. I put 4 mc's on this truck, bled the brakes 3 times and bypassed the ABS valve. The pedal bled down and it was almost to the floor before I got any brake action, until I put the last one on, the 10-2828.
Ford also has a TSB for the vacuum brake booster on diesels only. The OEM booster allows the pedal to bleed down when the engine in running but the truck is stopped, like waiting at a stoplight. They specify a booster part number that is only available from Ford and is not searchable by application; you have to specifically order that number. I need this also, however have not ordered one yet.
For more info google "Ford truck brakes TSB", you'll get a number of responses with more details.
97 F350 7.3 PSD CC 4X4