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Remanufactured Hydromax booster for International 4700 4900 casting 2771424 2771819.
Front mounting face of booster 2771424 where it bolts to the master cylinder.
Metal stamping detail for Hydromax casting number 2771424 and 2771819.
Rear view of booster 2771819 showing flow switch port for International school buses.
Remanufactured Hydromax booster for International 4700 4900 casting 2771424 2771819.
Front mounting face of booster 2771424 where it bolts to the master cylinder.
Metal stamping detail for Hydromax casting number 2771424 and 2771819.
Rear view of booster 2771819 showing flow switch port for International school buses.
Bexar Pro Componets

New Hydromax Booster Casting #2771424 #2771819 | International

$329.95

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5 in stock

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Casting #2771424 New Hydromax Booster | International Truck & School Bus

SKU: 52980565

Bexar Pro new Grade

Bexar Pro Components: Precision Safety for International Fleets & Industrial Equipment.

Restore your vehicle’s braking safety with this Professionally Engineered Hydromax brake booster from Bexar Pro Components. This assembly is a direct safety replacement for International trucks and school buses originally equipped with Casting #2771424 or #2771819.Each unit is restored to original factory specifications, ensuring heavy-duty fleet reliability across automotive and industrial applications. This assembly comes complete with new motor O-rings to provide a high-pressure, leak-free seal between the booster and your backup pump motor.

Spec Identifier Detail Application Note
Condition new Fully tested and certified for school bus safety.
Body Casting # 2771424 / 2771819 Verify your original housing stamping before purchase.
Hardware Included New Motor O-Rings Ensures proper high-pressure seal for backup pump motor.
Core Refund $50.00 Credit Refunded upon return of a rebuildable core within 60 days.

⚠ Expert Installation & Hardware Info

Based on our shop experience specializing in heavy-duty brakes since 1985:

  • Motor O-Rings: New Oval O-rings are included in the box. Always replace these when remounting your backup motor to prevent hydraulic leaks.
  • Pedal Rod: Reuse your original pedal rod if the length or eyelet differs from the pre-installed version. Note that changing the rod requires a new SKU 27-190 (grommet) for secure retention.
  • Core Return: To receive your $75 refund, please return your old core unit. This maintains the supply of high-quality castings for the International fleet community.

Technical Support Resources:

Access our video guides for rod swapping and official manuals for a successful installation.


Video Guide


Technical Manual
Bexar Pro Components

new Booster #2771424 / #2771819

Precision Safety for International Fleets & Industrial Equipment

Bexar Pro Components: Heavy-Duty Performance Since 1985

Weight 7 lbs
Dimensions 13 × 8 × 6 in

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