Product Description
HYDRAULIC 2-PISTON CALIPER (73MM BOSCH) – UNIVERSAL MOUNT
PART NUMBER(S):
Fleet Products: 55850 (New) | OE: 2501838C91, 2501839C91
DESCRIPTION:
Model: Bosch 73mm Twin-Piston
Vehicles: Navistar 3000–49000 Series (1998+), Freightliner, Universal Medium/Heavy-Duty
• Piston Diameter: 73mm
• Piston Material: Phenolic
• Inlet Port: 7/16" – 24
• Coating: Zinc-plated body for corrosion resistance
• Mounting: Universal — suitable for left/right, front/rear
Applications:
This twin-piston hydraulic caliper is a Bosch-style direct replacement for various mid- and heavy-duty applications. Ideal for front or rear axle placement, it offers balanced performance, reduced heat transfer, and long brake pad life. Common on Navistar and Freightliner platforms running hydraulic brake systems with compatible mounts.
CROSS-REFERENCE(S):
158.155850, 2501838C91, 2501839C91, 2509254C91, 2593419C, 2611391C91, 4153216, 4153222, 55850, 55850Z0H, 55850ZOH, 604-912, 7115N, BEN-55850, BER-55850, BW 055850, BW 055850ZOH, BW 55850, BW 55850ZOH, BX55850, BXR55850, E-11756-SL, E11756, E11756SL, E14688010, E146880102, E14688010BXR, FLT308101, FLTC308101, FLTC30810155850, L55850, R424153216, R4255850, R42R55850, R42R55850BXR, RBT-FRC11173, RH55850, RH55850X, S-10131, WA24110
A cross-reference listing means this part should be a suitable replacement for the part numbers listed. Please confirm all dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm compatibility with existing mounts and hydraulic system specifications
✔ Use only compatible pads (HP7655D786) and ensure shim kit is installed
✔ Replace hardware as needed to ensure secure fit
✔ Follow proper torque specifications and hydraulic system bleed procedure
✔ Check casting number to ensure compatibility with 4153222, 2501838C91, and 2509254C91
✔ Can be installed on either left or right wheel positions, front or rear axle
SOLD AS REMANUFACTURED | CORE RETURN REQUIRED
Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, Call: 1-877-243-0442 | Email: sales@fleet-products.com
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