The All Balls Brake Caliper Piston Kit, manufacturer part number 18-9040 and vendor part number 21-89040, is designed to rebuild one brake caliper on select Yamaha Grizzly 550 ATVs. This precision replacement kit is engineered for reliable fitment on 2009–2014 Yamaha YFM550FG Grizzly FI 4WD models with IRS, as well as 2009–2012 Yamaha YFM550FGP Grizzly FI 4WD EPS models with IRS. Verify your vehicle configuration and caliper application before installation.
Each All Balls kit includes the piston or pistons required to rebuild one caliper. The pistons are precision machined from high-grade 304 stainless steel, providing a durable alternative to original plastic composite, chrome-plated steel, and aluminum pistons. Stainless steel construction helps reduce thermal conductivity by up to 93% compared with aluminum, while resisting the corrosion and age-related brittleness commonly associated with other piston materials.
This brake caliper piston kit also eliminates failure-prone ceramic inserts used in some KTM applications, although fitment is specific to the Yamaha models listed above. Use the All Balls 18-9040 kit when restoring caliper performance during brake system service or rebuilding. Professional installation and inspection of seals, bores, brake fluid, and related components are recommended to support proper braking operation.
Features:
- Precision machined from high-grade 304 stainless steel
- Reduces thermal conductivity by up to 93% compared with aluminum
- Provides a durable replacement for plastic composite pistons that can become brittle with age
- Helps replace OEM chrome-plated steel and aluminum pistons that are prone to corrosion
- Eliminates failure-prone ceramic inserts found on some KTM models
- Includes the piston or pistons required to rebuild one brake caliper
- Fits select 2009–2014 Yamaha YFM550FG Grizzly FI 4WD IRS models
- Fits select 2009–2012 Yamaha YFM550FGP Grizzly FI 4WD EPS IRS models
Fitment:
2007 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2008 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2008 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2009 Yamaha YFM550 Grizzly EPS Hunter 4WD
2009 Yamaha YFM550 Grizzly Hunter 4WD
2009 Yamaha YFM550FG Grizzly FI 4WD [IRS]
2009 Yamaha YFM550FGP Grizzly FI 4WD EPS [IRS]
2009 Yamaha YFM700 Grizzly Hunter 4WD
2009 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2009 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2009 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2010 Yamaha YFM550 Grizzly EPS Hunter 4WD
2010 Yamaha YFM550 Grizzly Hunter 4WD
2010 Yamaha YFM550FG Grizzly FI 4WD [IRS]
2010 Yamaha YFM550FGP Grizzly FI 4WD EPS [IRS]
2010 Yamaha YFM700 Grizzly Hunter 4WD
2010 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2010 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2010 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2011 Yamaha YFM550 Grizzly EPS Hunter 4WD
2011 Yamaha YFM550 Grizzly Hunter 4WD
2011 Yamaha YFM550FG Grizzly FI 4WD [IRS]
2011 Yamaha YFM550FGP Grizzly FI 4WD EPS [IRS]
2011 Yamaha YFM700 Grizzly Hunter 4WD
2011 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2011 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2011 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2012 Yamaha YFM550 Grizzly EPS Hunter 4WD
2012 Yamaha YFM550 Grizzly Hunter 4WD
2012 Yamaha YFM550FG Grizzly FI 4WD [IRS]
2012 Yamaha YFM550FGP Grizzly FI 4WD EPS [IRS]
2012 Yamaha YFM700 Grizzly Hunter 4WD
2012 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2012 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2012 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2013 Yamaha YFM550 Grizzly EPS Hunter 4WD
2013 Yamaha YFM550 Grizzly Hunter 4WD
2013 Yamaha YFM550FG Grizzly FI 4WD [IRS]
2013 Yamaha YFM550FGP Grizzly FI 4WD EPS [IRS]
2013 Yamaha YFM700 Grizzly Hunter 4WD
2013 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2013 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2013 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2014 Yamaha YFM550 Grizzly EPS Hunter 4WD
2014 Yamaha YFM550 Grizzly Hunter 4WD
2014 Yamaha YFM550FG Grizzly FI 4WD [IRS]
2014 Yamaha YFM550FGP Grizzly FI 4WD EPS [IRS]
2014 Yamaha YFM700 Grizzly Hunter 4WD
2014 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2014 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2014 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2015 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2015 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2015 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2016 Yamaha YFM700 Grizzly Hunter 4WD
2016 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2016 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2016 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2017 Yamaha YFM700 Grizzly Hunter 4WD
2017 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2017 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2018 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2018 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2018 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2019 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2019 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2019 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2020 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2020 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2020 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2020 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2021 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2021 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2021 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2021 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2022 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2022 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2022 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2022 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2023 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2023 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2023 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2023 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2024 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2024 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2024 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2024 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2025 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2025 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2025 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2025 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2026 Yamaha YFM700F Grizzly Fi 4WD EPS Hunter [IRS]
2026 Yamaha YFM700F Grizzly Fi 4WD EPS XT-R [IRS]
2026 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]