Brake Caliper Piston Press Set AWTools AW18813 — 13-piece separator for caliper pistons

AWTools AW18813 is a 13-piece brake caliper piston separator set designed to assist with compressing and retracting caliper pistons during brake pad replacement and routine brake system maintenance. The set contains a selection of separator plates and adapters that accommodate different caliper designs, allowing controlled and even piston retraction to minimize the risk of damaging piston faces, seals, or caliper housings. The tool is intended for use in professional workshops as well as for home mechanics performing brake service and pad changes.

Advantages

The kit provides multiple plate sizes and adapter shapes to match a wide range of calipers, reducing the need for improvised tools or makeshift solutions. Its design ensures even pressure distribution across the piston surface to help prevent binding or seal damage. The compact set is easy to store and transport, and the dedicated adapters make it faster to align and compress pistons compared with single-purpose tools.

Suitable for

• Replacing brake pads on passenger cars and light commercial vehicles
• Compressing single and twin caliper pistons prior to installation of new pads
• Routine brake system service, inspection and caliper maintenance
• Use by automotive technicians, mobile mechanics and competent DIY enthusiasts

Key specifications

• Number of pieces: 13 (separator plates and adapters)
• Materials: hardened steel plates and metal adapters for durability
• Compatibility: multiple plate shapes and adapter types to fit varied caliper geometries
• Finish: corrosion-resistant coating for workshop environments
• Storage: compact case for organized storage and transport

How to use

Select the separator plate or adapter that matches the caliper piston face and orientation. Position the plate between the piston and the caliper housing, then apply steady, even force—typically using the caliper’s own screw or a compatible spreader tool—to retract the piston into the bore. Check that the piston moves smoothly and that seals are not pinched during compression. After piston retraction, install new brake pads and reassemble the caliper according to vehicle manufacturer instructions, then verify proper brake operation and fluid level.

Usage recommendations

Before use, inspect the caliper and piston for corrosion or damage and ensure the brake fluid reservoir cap is loosened to allow fluid displacement. Use appropriate personal protective equipment and follow vehicle manufacturer torque and service procedures. Store the set in its case to protect plates and adapters from damage and contamination.