Description
287479-G – DD-3 BRAKE ACTUATOR (LH)
PART NUMBER(S):
Fleet Products: 287479-G (New), 287479X (Remanufactured) | Replaces OE: Bendix K287479 | Other 287479, 287479X, 287479N, 4R-5-1, 4R-5-1CGRM
DESCRIPTION:
Model: DD-3 Safety Actuator – Left Hand Type 30, dual diaphragm with mechanical push rod locking system
Vehicles: Motor Coach Industries (MCI)
• Side: Left-hand (LH)
• Configuration: Horizontal mount, short rod
• Dimensions: 2.66 in rod end to non-pressure plate
• Dimensions: 3.88 in yoke pin to plate
• Dimensions: 12.69 in stud end to plate
• Dimensions: 1.25 in stud end to plate
• Mounting: Stud clocking 270°
• Material: Steel chamber assembly
• Performance: Mechanical push rod locking system
• Features: Yoke orientation 315° / 225°, push rod clocking 0° / 180°, port clocking 90°
Applications: Designed for MCI bus applications requiring a left-hand, short rod DD-3 safety actuator. This chamber delivers consistent service, emergency, and parking brake performance, maintaining mechanical hold even during air system failure.
CROSS-REFERENCE(S):
287479X, 4R-5-1, K287479, 4R-5-1CGRM
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm left-hand orientation and short rod configuration before install
✔ Apply BW 204-M barium-based lubricant in shaft cavity during service or rebuild
✔ Push rod must align to slack adjuster at a 90°+ angle to avoid drag
✔ Lock port must receive ~70 psi to release mechanical parking brake hold
✔ Clamping ring bolts must be tightened evenly to ensure diaphragm seal integrity
✔ Mounting studs and yoke clocking must align per OEM specs for proper fit
✔ New unit – no core return required
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Warranty Information
