Frenkit 742217 Disc Brake Caliper Repair Kit - Rear

Rear Brake Caliper Repair Kit for TRW Systems

The Frenkit 742217 disc brake caliper repair kit is built for rear brake service on select Audi applications equipped with TRW brake systems and a 42mm caliper piston diameter. It is a direct-fit service solution for restoring caliper sealing and piston function on supported Audi A4, A4 allroad, A4 Quattro, A5, Q5, S4, S5, and SQ5 models.

Use Frenkit 742217 when servicing a rear caliper on a vehicle with OE caliper numbers 8W0615403, 8W0615403G, 8W0615404, or 8W0615404G. This part number is commonly searched as a rear Audi brake caliper repair kit for TRW-equipped vehicles.

Key Features

• Disc brake caliper repair kit for rear brake service
• Brake system: TRW
• Caliper piston diameter: 42mm
• Fits select 2017-2018 Audi rear brake applications
• OE caliper number match for supported vehicles
• Frenkit 742217 for targeted caliper rebuilding work

Fitment Details

• Fits 2017-2018 Audi A4, rear, with Brake Caliper OE No. 8W0615403, 8W0615403G, 8W0615404, 8W0615404G
• Fits 2017-2018 Audi A4 allroad, rear, with Brake Caliper OE No. 8W0615403, 8W0615404
• Fits 2017-2018 Audi A4 Quattro, rear, with Brake Caliper OE No. 8W0615403, 8W0615403G, 8W0615404, 8W0615404G
• Fits 2018 Audi A5 Quattro, rear, with Brake Caliper OE No. 8W0615403, 8W0615404
• Fits 2018 Audi A5 Sportback, rear, with Brake Caliper OE No. 8W0615403, 8W0615404
• Fits 2018 Audi Q5, rear, with Brake Caliper OE No. 8W0615403, 8W0615404
• Fits 2018 Audi S4, rear, with Brake Caliper OE No. 8W0615403, 8W0615403G, 8W0615404, 8W0615404G
• Fits 2018 Audi S5, rear, with Brake Caliper OE No. 8W0615403, 8W0615403G, 8W0615404, 8W0615404G
• Fits 2018 Audi S5 Sportback, rear, with Brake Caliper OE No. 8W0615403, 8W0615404
• Fits 2018 Audi SQ5, rear, with Brake Caliper OE No. 8W0615403, 8W0615404

What It Is Used For

• Repairing a rear caliper with worn internal sealing components
• Addressing piston movement issues in a TRW rear brake caliper
• Restoring brake caliper function on Audi A4 and Audi Q5 platform vehicles
• Servicing rear brake calipers showing leakage or uneven operation
• Supporting maintenance on OE calipers 8W0615403 and related numbers

Installation Notes and Tips

Confirm the brake system is TRW and verify the caliper piston diameter is 42mm before ordering. Match the OE caliper number on the vehicle to the fitment notes for the exact rear application. Clean the caliper body thoroughly during service and inspect the piston, bore, and sliding surfaces for wear before reassembly.

For best results, compare the removed caliper to the OE numbers listed for the Audi A4, A4 allroad, A4 Quattro, A5, Q5, S4, S5, and SQ5 rear brake applications. Proper brake bleeding and a full system check should follow any caliper repair.

Quality Assurance

Frenkit specializes in brake service components for caliper rebuilding and repair applications. Part number 742217 is specified for TRW rear calipers with a 42mm piston diameter on the listed Audi models, helping ensure the correct service match when OE numbers and brake system details are verified.