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Message: [QUOTE="Peroni, post: 906676, member: 315"] 97 F Superduty, I replaced the entire braking system due to rust and previous owner neglect/abuse. PS pump, hydro booster, master, rabs valve plus the load control valves on suspension are all Motorcraft replacements. Using Schaeffers All Trans in the ps pump. Worked fine for about a year but has suddenly developed a kick back at the brake pedal. Does this about 20% of the time. Sometimes it's right when I step on the pedal. Other times it happens when I've already pushed the pedal down but not enough to start stopping the truck yet. I've read this could be due to contaminated fluid so I thoroughly flushed the system. Fluid that came out looked and smelled just as new as the stuff going in. Didn't change a thing. Everything is tight, no leaks anywhere. It just started happening one day. Still stops fine though. Could the hydro boost unit be failing causing this problem? [/QUOTE]

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