Description
12379 – BENDIX MASTER CYLINDER (HYDROMAX COMPATIBLE, LATE DESIGN – NEW)
PART NUMBER(S):
Fleet Products: 12379 (New) | OE: Replaces OE: Bendix 12379, M630274, 012379, 012379BXW | Dorman 15007799, 15142243, 19301986, 8150077990, 8151422430, 8193019860 | Euclid E151552 | Navistar 1691291C92, 2501592C91, 2505685C91| CAST#2239045 | Reybestos MC390325 | Centric 130.82008, 130.82007 | CARDONE 13-8042, 10-8041
DESCRIPTION:
Model: Bendix Hydromax-Compatible Master Cylinder – Late Design Switch/Slave (NAVISTAR, FORD, GMC, I.H.C, DODGE)
Vehicles: Medium-duty trucks, buses, and vocational chassis including International 3000/4000/4700–4900/7100, Freightliner S2RV/M2/FS65/MT35–55, Peterbilt 325/330/335/337, Kenworth T170/T270/T300/T370, Hino 145/165/185/238/258/268, Ford F-53/F-59/F-650/F-750/F-800, Blue Bird Vision/All American/TC2000, IC CE/BE/RE Series, Workhorse W16–W22, RV platforms (Fleetwood, Holiday Rambler, Winnebago, Tiffin Allegro, Itasca Suncruise)
• Bore Diameter: 50.80 mm (2.000 in)
• Reservoir Volume: 84 in³
• Primary Port: 9/16-18 inverted flare
• Secondary Port: 1/2-20 inverted flare
• Port Quantity: 3
• Mounting: 4-hole flange
• Material: Plastic reservoir
• Features: Brake light switch port, pushrod depth 0.578 in
Applications: Direct replacement master cylinder designed for Bendix Hydromax brake assist systems. OEM-grade fit for late-design platforms across trucks, buses, and motorhomes. Ensures reliable hydraulic performance and brake system safety. Ask for Availability: Hydromax (2772181/84) & Motor Replacement (2771544/1320)
HYDROMAX 2770454X
PUMP & MOTOR 2771494X
CALIPERS (BY AXLE WEIGHT):
6-12M FA & 13.5-17.5M RA
2.60" TWIN PISTON SYSTEM (FRONT & REAR) 55314
2.88" TWIN PISTON SYSTEM (FRONT & REAR) 55250
CROSS-REFERENCE(S):
00072400, 012379BXW, 108042, 11892, 11898, 11999, 12379X, 12406, 12632, 12671, 130.82008, 138042, 1669555C91, 1691291C91, 1691291C92, 2234933, 2234934, 2239045, 2302-83015, 230283015, 2500701C91, 35554308, 390325, 4C3Z2140A, 5396-RV12379X, 6U9Z2140A, 745-012379, 767653269771, 88925535, 8U9Z2140A, ASL2234934, BRMC205, BRMC226, BX012379, BX2234933, DU9Z2140A, DU9Z2140C, DU9Z2140E, E135-87-013, E135-88-020, E13587013, E13588020, E150396, F131792, F140744, F140747, F8HZ2140AA, HDXRV12379X, M113751, M12379, M630276, M901362, M94015, MBIRV12379X, MC140744, MC140747, MC390325, MIDRV12379X, R12379, RV12379, SBX2234933, W0000036, W8005118, ZZRV12379X, R12379, RV12379, 12379x, CAST#2239045, 2914, 4491, 4933, 9042, 9602, 11892, 11999, 12632, 12671, 11898, 2914, 4491, 4933, 9042, 9602, 12379, R12379, RV12379, 12379X, 2914, 4491, 4933, 9042, 9602, 11892, 11999, 12632, 12671, 11898, 13-8042, 10-8041, 130.82007, F141605, MC141605, 260-12379, R12379, RV12379, 12379X, VV12379, CAST2239045, MC390325, 605-MC390325, M901362, 390325, 00072400, BW012379, E13588020, 2234933, 5011409R91, 2505685C91, 2772114, 5008684, 3509615, 2517902C91, 1691291C92, 5012324, 3542179C91, 2505265C91, 2772859, , 024022358, 1691291C91, X2234491NAV, E13588020, BX012379, 2234491NAV, 2234491, X2234933NAV, 012379, 2234933, BW012379, 24071, E151552, 3524346, X2234933, 012379BXW, NAV1691291C92, 2501592C91, 5011314R91, SUM5011314R91, 2505685C91
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports, dimensions, and fitment match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Ensure compatibility with Hydromax brake systems (reference boosters: 2772181/2772184)
✔ Related motor replacements: 2771544, 2771494 (2771320) – confirm during service or rebuilds
✔ Bench bleed master cylinder before installation to eliminate air pockets
✔ Verify port thread sizes: Primary (9/16″–18), Secondary (1/2″–20)
✔ Confirm 4-hole flange matches vehicle mounting bracket
✔ Torque all hydraulic fittings to OEM specifications – avoid overtightening
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Warranty Information
