Front Disc Brake Conversion Kit for Dana 25 & Dana 27 Axles, 1941-1971 Willys & Jeep

Front Disc Brake Conversion Kit – Dana 25 & Dana 27 Axles (1941-1971 Willys & Jeep)

Upgrade your vintage Willys or Jeep with the largest front disc brake conversion kit available. Designed and developed by The JeepsterMan and Just Jeepsters team, this complete conversion delivers exceptional stopping power while maintaining a straightforward installation process.

Unlike many competing kits, this conversion utilizes massive 12-1/4" vented rotors measuring 1-1/8" thick, providing superior heat dissipation, improved braking performance, and increased durability. The specially machined rotors are designed to slide directly over your existing hubs, eliminating the need to replace hubs during installation.

Our exclusive USA-made caliper brackets position the calipers for maximum clearance while eliminating the grinding often required by other conversion kits. The design tucks the caliper closer to the axle, helping improve wheel clearance and simplifying installation.

Available Caliper Options

Big Bore GM Caliper Option

Our standard kit features brand-new loaded GM-style calipers with large 2-3/4" pistons for increased clamping force and excellent stopping performance. These are new calipers—not rebuilt units—and replacement pads and service parts are available at most local auto parts stores.

Low-Profile Caliper Option

For customers wishing to retain original wheels, we now offer a low-profile caliper option designed to provide additional wheel clearance compared to the standard big bore setup.

This version is intended to fit behind many factory 15" and 16" steel wheels without requiring wheel spacers. While wheel designs, backspacing, and manufacturing variations prevent us from guaranteeing fitment with every wheel, many customers have reported successful installations with no clearance issues and without the need for spacers.

Features

• Largest rotor available for Dana 25 and Dana 27 disc brake conversions

• Massive 12-1/4" vented rotors

• Rotor thickness: 1-1/8"

• 5 on 5.5 wheel bolt pattern

• Rotors specially machined by The JeepsterMan

• Reuses your existing hubs

• No hub replacement required

• New loaded calipers (not rebuilt)

• USA-made heavy-duty caliper brackets

• Grade 8 mounting hardware included

• No grinding required in most applications

• Easy-to-source replacement brake pads and service parts

• Detailed installation instructions included

• Technical support available from The JeepsterMan team

Kit Includes

• (2) 12-1/4" vented rotors, 5 on 5.5 bolt pattern

• (2) New loaded calipers with brake pads 

• (2) USA-made heavy-duty caliper mounting brackets

• Grade 8 mounting hardware

• Front brake hoses and banjo bolts

• New longer wheel studs for Dana 25 and early Dana 27 applications that originally used A473 or A474 wheel studs

• Detailed installation instructions

Important Notes

• Big Bore GM Caliper version is designed to clear most aftermarket 16" wheels.

• Big Bore GM Caliper version will not clear most 15" aluminum wheels.

• Clearance with factory and aftermarket wheels varies by wheel design and backspacing.

• Stock wheels may require 1-1/2" wheel spacers when using the Big Bore Caliper.

• Stock 16" steel wheels may require 1" wheel spacers when using the Big Bore Caliper.

• Low-profile caliper option may eliminate the need for spacers in many applications.

• Existing hubs are reused; bearings and races are not included.

• Bearings and races are available separately if needed.

• If additional wheel stud length is required, use Part Number 945451.

• If wheel spacers are being used, longer wheel studs may be required. Use Part Number 610080.

Fits:

• 1941-1945 MB
• 1941-1945 GPW
• 1946-1949 Willys Jeep CJ-2A
• 1949-1953 Willys Jeep CJ-3A
• 1953-1964 Willys Jeep CJ-3B
• 1955-1971 Willys Jeep CJ-5 and CJ-6
• 1950-1952 M38
• 1952-1966 M38A1
• 1947-1964 Willys Truck
• 1946-1964 Willys Station Wagon and Sedan Delivery
• 1967-1971 Jeepster Commando

Disc Brake Installation Instructions

Caliper Pad Installation Instructions