Description
18003998X – DELCO HY-POWER HYDRO-VAC HYDRAULIC BRAKE BOOSTER
PART NUMBER(S):
Fleet Products: 18003998X (Remanufactured) | OE: Delco 18003998, 18001810, CASTING #2623435, Delco Hy-Power; Interchange: 18001810X
DESCRIPTION:
Model: Hydraulic Brake Booster – Remanufactured, 5 1/2”, Threaded and Staked
Vehicles: GM medium/heavy-duty trucks, International Harvester (IHC), and Ford commercial trucks
• Remanufactured Hy-Power style hydraulic brake booster with integrated threaded push rod
• Standard 5-1/2″ threaded rod (RS2 extension available for 7″ configuration)
• Frame or firewall-mounted unit with OEM-style bracket fitment
• Tube-type O-ring hydraulic fitting for Hydro-Vac assist systems
• Compatible with 501830C91 / RV20001K flow switch for proper operation
• Housing diameter approx. 12.75″; diaphragm diameter approx. 11.25″
• Fully tested and rebuilt to OEM specifications for reliable brake assist performance
DELCO HY-POWER MOTORS: 18006974X
Applications: Is this Hydro-Vac brake booster right for your truck✔ Yes—designed for GM, IHC, and Ford medium- and heavy-duty trucks requiring robust frame- or firewall-mounted hydraulic brake assist. Frequently used in fleet vehicles operating under demanding duty cycles and commercial service conditions.
CROSS-REFERENCE(S):
18003998, 600-18003998, 600-18003998S, RV18003998X, TWDH18003998X, H18003998X, 484238C91, 504837C91, 2623435, 2823435, 18005544, 5396, 767653166988, 18001810, 18001148, 18004527, 18006232, 18011248, 18011482, 18012148, 18012330, 18018077, 18015765A 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:
✔ Supplied with 5-1/2″ threaded push rod – verify length; RS2 extension available for 7″ configuration
✔ Flow switch (501830C91 / 18005544 ) is required – confirm compatibility before installation
✔ Use tube-type O-ring fittings and only DOT 3 or DOT 4 compatible brake fluid
✔ Mount securely to frame or firewall using OEM bracket orientation
✔ Core unit must be returned in rebuildable condition
✔ Perform complete system bleeding and brake function test before returning vehicle to service
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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Warranty Information
