DUAL BRAKE MASTER CYLINDER FOR FIAT AND FORD 5103926

Dual Brake Master Cylinder for Fiat, and Ford Tractors

The dual brake master cylinder, part number 5103926, is installed in the hydraulic braking system of several tractors Fiat, as well as the Ford 8630 and 8830. This part replaces a critical component of the braking system and is comparable to part numbers 5103926 and 5103927. It is designed for use with monograde mineral oil; this must be verified before reinstalling it on the machine.

The role of the master cylinder in tractor braking

The master cylinder receives the force applied to the pedal and converts it into hydraulic pressure transmitted to the braking system. On a tractor, it plays a direct role in brake control and ensures proper pedal feel. When it develops a leak, a loss of pressure, or irregular operation, replacing the part is the logical step to restore the system to proper working order.

This part number corresponds to a dual-line model. For the buyer, this designation is important because it helps rule out other master cylinder configurations that do not use the same mounting setup.

Documented Applications for This Part Number

This part is used on Fiat tractors of the following series and models:

• Fiat 88 Series
• Fiat 90 Series
• Fiat 94 series
• Fiat 1280

It is also documented for the following tractors:

• Ford 8630
• Ford 8830

A detailed list of compatible models appears at the end of the main text, with the variants listed for each tractor. If your machine has a suffix such as DT, be sure to include it when identifying the model.

Helpful guidelines for choosing the right master cylinder

To select this part number, start by noting the exact model designation of the tractor and the part number on the removed part. Part numbers 5103926 and 5103927 serve as useful points of comparison here. The part type is equally important: this is indeed a dual-circuit brake master cylinder.

The type of fluid specified should also be noted. This version is designed for use with a single-grade mineral oil. Before installation, it is advisable to check the tractor’s specifications to ensure compatibility with the existing system.

When should you consider replacing it?

Replacement may be necessary if the pedal feels spongy, if braking is inconsistent, or if a leak develops at the master cylinder. On a work or transport vehicle, this component must remain in good condition to ensure precise and predictable braking control.

If you’re comparing several part numbers, first check the exact tractor model, then the part number on the existing component to select the correct master cylinder.

Compatibility by Make and Series

Fiat · Tractor

• 100-90
• 100-90DT
• 110-90
• 110-90DT
• 115-90
• 115-90DT
• 1280
• 1280DT
• 130-90
• 130-90DT
• 140-90
• 140-90DT
• 160-90
• 160-90DT
• 180-90
• 180-90DT
• 55-88
• 55-88DT
• 55-90
• 55-90 DT
• 60-88
• 60-88DT
• 60-90
• 65–88
• 65–88 DT
• 65-90
• 65-90DT
• 70–88
• 70-88DT
• 70-90
• 70-90DT
• 72-94
• 72-94DT
• 80-88
• 80-88DT
• 80–90
• 80-90DT
• 82-94
• 82-94DT
• 85-90
• 85-90DT
• 90-90
• 90-90DT

Ford · Tractor

• 8630
• 8830

88 Series

• 55-88
• 60–88
• 65–88
• 70–88
• 80–88

90 Series

• 55–90
• 60–90
• 65–90
• 70–90
• 80–90
• 85–90
• 90–90
• 100–90
• 110–90
• 115–90
• 130–90
• 140-90
• 160-90
• 180-90

94 Series

• 72–94
• 82–94
• 1280

FAQ — Frequently Asked Questions

What is the purpose of this dual brake master cylinder on a tractor?

This dual brake master cylinder converts pressure applied to the pedal into hydraulic pressure sent to the braking system. It is part of the tractor’s braking system and plays a direct role in transmitting force to the brakes. It should be replaced in the event of a leak, an abnormal pedal feel, or uneven braking.

How can I verify if this part number is compatible with my Fiat 80-90DT, 72-94DT, or 1280DT?

To verify correctly, note the exact model designation of the tractor and compare it to the part number of the removed component. This version corresponds to a dual-circuit brake master cylinder; compare it to part numbers 5103926 and 5103927. Also verify that your brake system uses a single-grade mineral oil before reassembly.

Is this part also compatible with the Ford 8630 and 8830?

Yes, this part number is listed for Ford 8630 and 8830 tractors, in addition to numerous other applications Fiat. To confirm the replacement, compare the part number installed on your machine with the tractor’s complete identification. This helps avoid confusion with another version of the brake master cylinder.

Why is the “monograde mineral oil” specification important?

This specification serves as a guide for selecting the part and for inspecting the system before service. A master cylinder must be used with the fluid specified for the machine. If you are replacing an old unit, check the tractor’s specifications to ensure you use the type of oil compatible with the system.

Original replacement part numbers and brand names are provided for comparison purposes only. This does not imply that these are original parts.