Did you replace the brake hoses? They can deteriorate on the INSIDE causing "drag". You are saying he put the wrong retainers on the calipers, I didn't know you could do that, also if he swaps brands, Napa (at least here) will only take the brand you get in exchange so he should have had the correct retainer clips.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"