CATBrake Parts

5D8755 Master Cylinder Kit — Cat 120 120b

This master cylinder kit is the primary control component for the hydraulic braking system, converting mechanical force into hydraulic pressure. It is built with high-quality seals and precision-machined components to ensure reliable operation and prevent fluid leaks. Operators may experience a soft or sinking brake pedal, reduced braking pressure, or fluid leaks around the master cylinder when this kit fails.

Master Cylinder Kit – Part No 5D8755 – 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 TypeMaster Cylinder Kit
MaterialCast iron, rubber seals
ApplicationHydraulic brake system
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing master cylinder kit is typically a brake pedal that feels soft, spongy, or sinks to the floor when pressed. This indicates internal seal leakage, reducing hydraulic pressure to the brakes. If left unaddressed, braking effectiveness will be severely compromised, posing a significant risk to operational safety and potentially leading to brake system failure.

Installation Tip

Thoroughly flush and bleed the brake system after installing the new master cylinder kit to remove air and old fluid. Ensure the reservoir is filled to the correct level with the specified brake fluid.

Service Note

Inspect brake lines, brake fluid, and wheel cylinders or calipers when replacing the master cylinder kit.