Methods:
* C-Clamp Method: This is a common method, especially for single-piston calipers. You'll need a C-clamp appropriately sized to fit between the caliper and the brake pad. Place a piece of wood or metal between the clamp and the caliper piston to avoid damaging the piston's surface. Slowly and evenly squeeze the clamp to push the piston back into the cylinder.
* Brake Caliper Compression Tool: These tools are specifically designed for this purpose and come in various sizes to accommodate different caliper types. They often feature a piston-sized cup that distributes pressure evenly, preventing damage to the piston seal. This is generally the safest and most recommended method.
* Using a Bench Vise (With Caution): A bench vise can work on simpler calipers, but it requires extreme caution to avoid damaging the piston or caliper. Use soft jaws or protective material between the vise and the piston. This method is generally less preferred due to the higher risk of damage.
* Ratchet Strap Method (For really stubborn pistons): This is a less precise method, usually used as a last resort. Wrap a sturdy ratchet strap around the caliper, securing it to a solid point on the quad. Tighten the strap gradually, but be extremely careful not to damage the caliper.
Important Considerations:
* Cleanliness: Always clean the caliper and piston area thoroughly before attempting compression. Dirt and debris can damage seals.
* Lubrication: Lightly lubricating the piston with brake caliper grease (not regular grease) can help the piston slide more easily. Avoid getting grease on the brake pads.
* Even Pressure: Apply pressure evenly to prevent warping or damaging the piston.
* Correct Caliper Type: The method you choose depends on the type of caliper (single-piston, dual-piston, floating caliper). Dual-piston and floating calipers often require more specialized tools.
* Brake Fluid Reservoir: Before starting, check the brake fluid level in the master cylinder reservoir. As you compress the piston, fluid will be pushed back into the reservoir. If it's full, you risk overflowing the reservoir, spilling fluid, and causing air bubbles in the system. Consider opening the bleeder valve slightly to allow for fluid displacement. This helps to prevent the introduction of air bubbles in the braking system.
If you are unsure about any step, consult your ATV's service manual or a qualified mechanic. Incorrectly compressing a brake piston can damage the caliper and compromise your braking system, potentially leading to dangerous situations.
