Case 21 Series Wheel Loader Brakes

Brake discs, calipers, master cylinders, pistons, and ZF axle brake components for Case 21 series wheel loaders, covering wet-disc and hydraulic brake systems across the 521, 621, 721, 821, 921, and 1021 model lines through multiple generations.

Fits Models At A Glance

• 521 Series: 521D, 521E, 521F, 521G, 521G2
• 621 Series: 621, 621B, 621C, 621D, 621E, 621F, 621G, 621G2
• 721 Series: 721, 721B, 721C, 721D, 721E, 721F, 721G, 721G2
• 821 Series: 821B, 821C, 821E, 821F, 821G, 821G2
• 921 Series: 921C, 921E, 921F, 921G, 921G2
• 1021 Series: 1021F, 1021G, 1021G2

Key Notes

• Application: Service and wet-disc brake components for 21 series loaders
• Axle Fitment: Many rings, seals, and pistons designed for ZF axles
• Serial Breaks: Several parts split by before/after serial numbers
• Coverage: Discs, calipers, master cylinders, seals, and repair kits

Why Choose Broken Tractor

• ✅ Deep coverage across every 21 series generation
• ✅ New and rebuilt brake parts available now
• ✅ Fast shipping from two US locations

Frequently Asked Questions

How do I know if I need the brake parts for a 621 or 721 before or after the serial number break?

Several brake parts for the 621 and 721 are split by serial number, so the correct piece depends on your machine's build. For example, the Brake Shoe S301674 fits the 621 after JAK0027127 and the 721 after JAK0022629, while the Resealing Kit N7964 and Brake Shoe S300718 fit units built before those serials. Match your loader's serial number to the part fitment, or confirm with our parts team before ordering.

Which brake discs fit a Case 621B, 721B, or 821B with ZF axles?

Broken Tractor carries several brake discs for the 621B, 621C, 721B, 721C, 821B, and 821C. The Brake Disc 119430A1 is listed for ZF axles on these models, while the Brake Disc 119431A1 and Lined Brake Disc 119433A1 cover units built before specific serial numbers such as JEE0123545 on the 621C. Check your serial number against the listing to pick the right disc.

Do you carry a brake master cylinder rebuild kit for a Case 621 wheel loader?

Yes, we offer the Brake Master Cylinder Rebuild Kit N8937, which fits the 621, 721, and 821 among other loaders. Broken Tractor also carries complete master cylinders, including the N8695 and the L113007 with air chamber, for these same models. If you are repairing rather than replacing, the rebuild kit is the part to match.

What brake parts fit the newer Case 521G, 721G, and 1021G loaders?

We carry a range of ZF axle brake components covering the G and G2 series, including the Brake Oil Sealing Ring 8605315, Axle Sealing Ring 8605314, Brake Ring 8603577, and Axle Ring 8603579, which all list 521 through 1021 G models. These are wet-disc and axle brake pieces for later 21 series loaders. Match the part number to your model to confirm the correct fitment.

Does the friction disc 87341835 fit a Case 521D or 621F wheel loader?

Yes, the Brake Friction Disc 87341835 is listed to fit the 521D, 521E, 521F, 521G, 621D, 621E, 621F, and 621G among other models. It also covers several 721 and 821 series loaders. Confirm your exact model against the fitment list, or reach out if you are unsure which disc your machine uses.