Place a rag over the brake caliper piston to prevent it from popping out and then force out the piston using compressed air.
Do not use high pressure air to prevent brake caliper piston damage.
Remove the dust seals and piston seals.
Do not reuse the dust seals and piston seals to prevent fluid leakage.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.