A key component of the wet brake pack – this is a precision-made brake friction disc by GX-AFTER. It is designed for the drive axles in CATERPILLAR backhoe loaders (e.g., 416B, 426B, 428B, 436B, 438B) and compactors (CP/CS). Unlike steel plates, this disc features a high-performance Sintered Bronze (SBRZ) friction material and 22 internal teeth (splines) to engage the axle shaft. The special "waffle" groove pattern (SPR/WAG) ensures optimal oil circulation, cooling, and smooth braking.
GX-AFTER is the smart choice for your machine. We provide high-class replacement parts that combine excellent quality with an attractive price. Each part is carefully verified to ensure full compatibility and reliability you can depend on.
| Brand | Type / Series / Model |
|---|---|
| CATERPILLAR | Backhoe Loaders: 416, 416B, 426, 426B, 428, 428B, 436, 436B, 438, 438B Compactors: CP-563C, CS-531C, CS-531D, CS-563C, CS-573D, CS-583C, CS-583D |
The list above is for reference. We recommend verifying the part number or exact dimensions (OD 204.5mm / 22 Teeth / Thickness 4.8mm) before purchasing.
Servicing wet brakes in a drive axle is an advanced repair. It requires the machine to be securely supported on stands and involves removing heavy components (wheels, planetary hub). A faulty brake system is a fatal hazard. Ensure the system is properly bled after repair.
The friction disc is the executive component in a wet brake pack. It has internal splines (22 teeth) that engage the axle shaft. During braking, a piston compresses the pack, and the friction between these SBRZ discs and the steel separator plates (9R2476) stops the machine. Wear or damage to these discs is the primary cause of brake failure.
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This disc (9R2477) is the friction component (made of Sintered Bronze - SBRZ) and has internal teeth (22 splines) that engage the axle shaft. The plate (9R2476) is the smooth steel separator disc that goes between the friction discs.
2. What does SBRZ and SPR/WAG mean?SBRZ stands for Sintered Bronze, which is the high-performance friction material used in wet brakes. SPR/WAG (Spring/Waffle) refers to the specific "waffle" groove pattern on the disc's surface, which helps oil circulation and cooling.
3. Will this fit a CAT 428C, D, E, or F?No. This part number 9R2477 is specific to the older CATERPILLAR 416, 426, 428, 436, 438 and their B-series variants. Newer machines (C, D, E, F) use completely different axles and brake packs with different part numbers and dimensions.
Have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you choose the right part to get your equipment back to work as soon as possible.
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Dimension: 204.5x53.3x4.8

















