CATBrake Parts

3t9960 Disc-Friction — Cat 517 518

This is a friction disc, a critical component within the brake system responsible for generating the necessary friction to slow or stop the equipment. It is manufactured to meet stringent quality standards, ensuring superior performance and durability compared to a worn or glazed disc. Operator symptoms of a failing friction disc include a spongy brake pedal, reduced braking effectiveness, and unusual noises during braking.

Disc-Friction – Part No 3t9960 – CAT Spare Part
Part Specifications
BrandCAT
CategoryBrake Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Always replace brakes in axle sets. Bed-in new brake pads with 8–10 moderate stops from 40 km/h. Check disc runout with a dial gauge — maximum 0.1 mm. Inspect caliper slides and pistons when replacing pads.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeFriction Disc
MaterialSintered metal or composite friction material
ApplicationBrake system clutch pack
Service LifeReplace as needed based on wear inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A spongy or soft brake pedal is often the first indication of a worn friction disc. If ignored, braking effectiveness will continue to diminish, requiring more pedal effort and longer stopping distances. Continued operation with severely worn discs can lead to overheating and damage to other brake system components.

Installation Tip

Ensure the brake housing is thoroughly cleaned of old friction material and fluid residue before installing new discs. Avoid overtightening fasteners, as this can warp the disc or damage the housing.

Service Note

Inspect brake plates, seals, and brake fluid for contamination or wear when replacing friction discs.