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There is a tool available for the purpose. The tool fits into the caliper piston head notches, and has a turnscrew which rotates the caliper piston head while compressing it. Watch the caliper piston boot while turning, as it can catch and tear. It helps to use a small screwdriver to push the seal of the boot back slightly before compressing the piston; less likely to catch and tear that way. If you notice the boot pulling, back up on the turnscrew to relieve tension on the boot, and use the small screwdriver. I 'rented' the tool at Autozone; they put the cost of the tool on your credit card, then refund it when you return the tool.

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Q: How do you compress the caliper piston on a 2004 vw jetta tdi?
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