JEGS 555-631803 GM 10 & 12 Bolt Rear Disc Brake Conversion Kit

The JEGS 631803 rear disc brake conversion kit has everything you need to convert the rear drum brakes to a disc brake system on a 1955-1968 Full-Size GM Car. This Kit will add modern safety to your classic car, drastically improve the stopping distance, and gain your confidence while driving. This upgrade is intended for street-driven vehicles while maintaining the emergency brake and utilizing some stock components.

JEGS 555-631803 GM 10 & 12 Bolt Rear Disc Brake Conversion Kit Includes:

• (2) Hubless 10 Hole, 11 in. Drilled & Slotted Rotors (Dual Lug Pattern: 5 x 4.500 in. and 5 x 4.750 in.)
• (1 Set) Large GM Black Powder Coated Calipers w/Self Adjusting E-Brake and D54 Pads (1979 Cadillac El Dorado)
• (2) Caliper Brackets & Spacers
• (2) 10 mm Rubber Brake Hoses
• (2) 10 mm Banjo Bolts
• (4) 10 mm Copper Washers
• (6) 3/8 -24 x 50 Bolts
• (6) 3/8 -24 Lock Nuts
• (6) 20 x 10.5 x 2 Washers
• (2) Brake Hose Clips
• (2) Brake Hose Mounting Tabs
• (1 box) Left Driver Side & Right Passenger Side Caliper Brackets
• (6) Shims
• (2) Square Backing Plates/Axle Flange
• (2) E-Brake Cables, Backing Plate to Equalizer
• (1) E-Brake Cable Extension and attaching Clips
• Designed for axles with a 3.375 in. (3 3/8 in.) flange [center-to-center spread of the flange's top two bolt holes]

JEGS 555-631803 GM 10 & 12 Bolt Rear Disc Brake Conversion Kit Notes:

• Does not fit axles with a 3 1/8 in. flange bolt pattern [center-to-center spread of the flange's top two bolt holes]
• Does not fit S-10 Chassis or truck frames
• Maximum diameter of 6.110 in. to fit rotor hat.
• Rotor Center = 2 3/4 in. - Rotor Hat Section Inside Diameter = 6 3/16 in. 
• You will need to modify your axles if they will not fit inside the rotor hat and you will need to modify the rotor if the center hole is too small for your axles. 
• 0.050 x 45 Degree Chamfer
• 2.786 in. max register axle
• The installation of disc brakes will require the use of 15 in. wheels
• This brake conversion kit will not work with 14 in. wheels
• Does Not Fit S-10 Chassis or Truck Frames
• This kit Requires a disc/disc proportioning valve. We recommend JEGS 555-63025 sold separately.
• We recommend a 1.125 in. large bore master cylinder when adding disc brakes. We recommend JEGS 555-631200 sold separately.

Emergency Brake Note: The emergency brake cables provided in the kit will fit the 1955-1964 Full-Size Chevrolet. Any other application will require the customer to modify the included cables to work with their application. The intermediate cable, center-pull, and cable couplers may not be necessary on 1958-1964 cars.

How To Measure Rear Axle Hub Flange & Register Dimensions