2504106X | Tandem Hydrovac (3 Line) 3761378, 3874185, 51-8009

2504106X - TANDEM HYDROVAC (3 LINE)

PART NUMBER(S):

Fleet Products: 2504106X, 2504106 | OE: 2504106 | CARDONE: 51-8009, Ford/IHC: 3761378, 3874185, 3874186, 3874189, 51-8009

DESCRIPTION:

Model: Tandem Hydrovac Brake Booster, Fourth Series, Tandem Diaphragm
Vehicles: General heavy-duty trucks and trailers; historically used in some vintage Dodge/Chrysler vehicles (e.g., 1954–1956 Windsor);

• Diaphragm Diameter: 12-3/4"
• Overall Length: 24-1/2" (Power Brake Sales), 19.00" (CARDONE)
• Input Port: 1/4" Inverted Flare
• Output Port: 5/16" Inverted Flare
• Additional Port Thread Size: 1/2"-20 (CARDONE)
• Mounting: Frame mount, bracket included (hardware not included)
• Actuation Type: Vacuum-suspended tandem diaphragm
• Housing Material: Steel
• Weight: 26.57 lb (CARDONE)
• Diaphragm Configuration: Tandem
• System Type: Three (3) line unit
• Output Connects: To master cylinder reservoir
• Unique Features: Remanufactured to OEM standards; core return required

Applications:
Designed for brake systems on heavy-duty trucks and trailers requiring high-output vacuum-assisted hydraulic brake boost. Tandem diaphragm configuration provides enhanced assist force for demanding applications.

CROSS-REFERENCE(S):

2504106X, 2504106, 2512076, 2772819, HDX RV2512076, 51-8009

A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.

IMPORTANT INSTALLATION NOTES:

✔ Frame-mounted unit includes mounting bracket; verify correct orientation during installation
✔ Ports: Input – 1/4" inverted flare, Output – 5/16" inverted flare, Port threads – 1/2"-20
✔ Minimum vacuum requirement: 14" Hg at booster
✔ Pedal test: Pedal should drop slightly when engine starts, indicating proper booster function
✔ Confirm vacuum check valve is installed above manifold or on firewall for best performance
✔ Check system for leaks under pedal pressure (25–30 lbs hold test); falling pedal indicates hydraulic leakage

SOLD AS REMANUFACTURED | CORE RETURN REQUIRED

Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.

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