Join Date: Feb 2010
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I'd say brake booster. I had a similar problem with my '08 where the pedal would sometimes be hard to push where it felt like it was almost sticking (went out at only 115k, not 280k!) and then other times it felt like it was too soft all together. I know with the 6.4L replacing this also required draining the power steering fluid as well.
2008 F-350 King Ranch Dually 4x4, 33" BFG Mud Terrains, SCT Programmer with DPF and CAT Delete Pipe
2004 F-250 Lariat FX4, 35" BFG A/T, 4" Pro-Comp Lift with Dual Stabilizer Kit, In-Dash Nav/DVD, 2x12" Pioneer Subs with 2400 Watt Kenwood Amp, Banks Intake, Bosch Starter, 220k miles
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