If you remove the calipers, just do a good bleed on the system when you reattach them. If the boots are torn and dirt and moisture has entered into the caliper bore and rusted the piston bore then you will need to replace the calipers if they are leaking or sticking. Did you replace the boots?

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record