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The '01 had them as well. It's part of the piston, not a separate cap. In some instances phenolic pistons can edge crumble so the cap provides a more durable surface.
Before breaking out the prybar, it's better to break out the C-clamp and push the pistons back in for clearance which is the usual fashion of working on brakes. There are a number of different models of vehicles from all the manufacturers that have the retention protrusions (we use another name that would get screened out).
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Jack
Former Vehicle Test Manager - Friction Products
03 F350SC 4x4 6.0 Auto 5/30/03
Truck Modifications below in Pictorials on Facebook. Search in Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
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