SOURCE: compressing the rear disc brake caliper on 2008 grand caravan
The rear calipers on these models require a special tool that compresses and turns the piston in at the same time -- most parts stores carry this tool.
It is called a caliper piston press -- and it installs where the pads would go and acts like a c-clamp,when turning handle it will turn the caliper piston backinto the caliper as it compresses it.
Anytime the brake rotor or brake pads are being replaced, the rear caliper piston must be seated (bottomed) to compensate for the new brake rotor or lining. Because the Parking Brake self-adjuster mechanism is attached to the piston, a special seating method is required. The only acceptable method is by rotating the piston back into the bore using Retractor,MILLER Special Tool 8807, . Any other seating method will damage the self-adjuster mechanism.
Good luck and hope this helps.
SOURCE: Do I have bleed the brake line when you replace
If you disconnected any brake lines then yes you have to bleed them.
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