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Message: [QUOTE="rusty1161, post: 1523188, member: 1386"] So, in the process of chasing down my issue with dragging front disc brakes, I started with replacing the calipers, since the pistons were hanging up and not releasing. Further searches and research came across the issue others have had with the hydroboost MC pushrod length. Too long and the piston doesn’t retract fully and the compensating ports stay covered making it so the brakes can’t fully release. Well, I finally checked mine and what I found is in the pics. This is with the two nuts that secure the MC completely loose, and as far as the MC will sit back against the pushrod without compressing the piston inside the MC. The common spec is for no load on the piston and about .020” clearance. The gap shown is .040” so I have temporarily shimmed mine with a 1/8” body shim that measures out to be .061”, so I’m right at .020” pushrod clearance. Time and miles will tell if this was part of the issue, but after the first couple of tanks I am up an average 3 MPG. This hydroboost is a Motorcraft unit and came with the pushrod. My MC is aftermarket, so that might be where the clearance issue was created. I’ll update if this is the fix long term. Rusty [/QUOTE]

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