Federal Military Parts (763) 310-9340
AM General HMMWV Humvee H1 Rear Right Brake Caliper 12342342 | NSN 2530-01-333-8263
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Rear Right brake caliper
Part No: 12342342 | NSN: 2530-01-333-8263
Part No: 12342342 | NSN: 2530-01-333-8263
Restore the stopping power and safety of your tactical vehicle or civilian H1 with this genuine OEM replacement Rear Right (Passenger Side) Brake Caliper. Manufactured by AM General to strict military specifications, this hydraulic disc brake caliper is designed to handle the immense weight and off-road demands of the HMMWV platform.
This unit is a direct-fit replacement for the rear passenger side and is essential for maintaining the integrity of your braking system. Whether you are performing a restoration, fleet maintenance, or fixing a seized part, this OEM caliper ensures reliable performance and perfect fitment without the headaches of modifying aftermarket generic parts.
Key Specifications:
- Position: Rear Right (Passenger Side)
- Part Number: 12342342 (Interchange: 5596808, 12173601)
- NSN: 2530-01-333-8263
- Piston Diameter: 66mm (Single Piston)
- Compatible GVWR: Fits 10,300 lb GVWR models and various other configurations.
- Condition: New / NOS (New Old Stock) components available.
Compatible Vehicle Models:
This part is compatible with a wide range of AM General HMMWV (Humvee) M-Series variants and the Civilian Hummer H1.
Military HMMWV Models:
- M998 / M998A1 (Cargo/Troop Carrier)
- M1025 / M1026 (Armament Carrier)
- M1035 (Soft Top Ambulance)
- M1038 (Cargo/Troop Carrier with Winch)
- M1043 / M1044 (Armament Carrier)
- M1045 / M1046 (TOW Carrier)
- M1097 (Heavy Variant)
- M1121 / M1123
- M1151 / M1152 / M1167
Civilian Models:
- Hummer H1 (1992–2006)
Why You Need to Replace This Item:
The rear brake calipers on HMMWVs and H1s are critical safety components that often fail due to age, extreme use, or long periods of sitting. You should consider replacing this caliper if you notice:
- Seized Pistons: If your vehicle pulls to one side while braking or the brakes feel "stuck" engaged, the internal piston may be seized due to rust or debris. This is common in surplus vehicles that have sat idle.
- Fluid Leaks: Puddles of fluid near the inner tire or wetness around the caliper seals indicate a hydraulic failure. A leaking caliper leads to total brake pressure loss.
- Parking Brake Failure: On the HMMWV, the rear calipers house the parking brake mechanism. If your parking brake no longer holds the truck on an incline or the lever is frozen, the entire caliper assembly often requires replacement.
- Uneven Pad Wear: If the rear right brake pads are wearing down significantly faster than the left, your caliper slide pins or piston are likely not retracting correctly.
