Frenkit 742216 Disc Brake Caliper Repair Kit - Rear

Rear Brake Caliper Repair Kit for BMW

Restore rear braking performance with the Frenkit 742216 disc brake caliper repair kit. Built for Bosch brake systems with a 42mm caliper piston diameter, this kit is specified for a wide range of rear BMW applications and OE caliper numbers.

Compatible With rear BMW 2 Series, 3 Series, 4 Series, and select Gran Coupe and GT models, this repair kit supports precise caliper service for common rear brake wear issues. The Frenkit 742216 is a direct-fit service solution for Bosch-equipped vehicles that need caliper seal and piston-area refurbishment.

• Brand: Frenkit
• Part Number: 742216
• Disc brake caliper repair kit for rear applications
• Brake system: Bosch
• Caliper piston diameter: 42mm
• Fits BMW rear calipers with OE numbers 34216850857, 34216850858, 34216850973, and 34216850974 on listed applications

Detailed Fitment and Application

This Frenkit 742216 repair kit is used on rear Bosch calipers across multiple BMW platforms, including 2012-2018 BMW 320i rear, 2014-2016 BMW 328i rear, 2016-2018 BMW 330i rear, and 2016-2018 BMW 340i rear applications. It also covers rear fitments for BMW 228i, 228i xDrive, 328d, 330e, 430i, 440i, and related xDrive, GT, and Gran Coupe variants listed in the fitment data.

This part cross-references OE caliper numbers 34216850857 and 34216850973 for the same application.

• Fits 2017-2018 BMW 230i, rear, with Brake Caliper OE No. 34216850857, 34216850858
• Fits 2012-2018 BMW 320i, rear, with Brake Caliper OE No. 34216850857, 34216850858
• Fits 2014-2016 BMW 328i, rear, with Brake Caliper OE No. 34216850857, 34216850858, 34216850973, 34216850974
• Fits 2016-2018 BMW 330i, rear, with Brake Caliper OE No. 34216850857, 34216850858, 34216850973, 34216850974
• Fits 2016-2018 BMW 340i, rear, with Brake Caliper OE No. 34216850973, 34216850974
• Fits 2017-2018 BMW 430i, rear, with Brake Caliper OE No. 34216850857, 34216850858, 34216850973, 34216850974
• Fits 2017-2018 BMW 440i, rear, with Brake Caliper OE No. 34216850973, 34216850974

What This Repair Kit Helps Address

• Rear caliper seal wear that can lead to brake fluid seepage
• Sticking or uneven caliper piston movement
• Brake drag caused by deteriorated internal caliper components
• Loss of consistent rear brake pedal feel
• Service needs on Bosch rear calipers with a 42mm piston

Installation Notes and Tips

Confirm the brake system is Bosch and verify the OE caliper number before ordering. Match the rear caliper piston diameter to 42mm and compare the vehicle’s caliper casting or OE reference against the fitment notes for your BMW 230i, 320i, 328i, 330i, 340i, 430i, or 440i application. Clean the caliper thoroughly during service and inspect the piston, bore, and slide surfaces before reassembly.

Quality Assurance

Frenkit manufactures brake service components for caliper repair applications, and this kit is built to service the specified Bosch rear calipers on listed BMW models. Use the OE reference and piston diameter to confirm correct application before installation.