Product Summary

Universal Fit, Rear Position, 11.75 Inch Rotor Diameter

  • Replace those old drum rear brakes with modern disc brakes using this universal weld on disc brake kit
  • Features '69-'77 GM calipers with massive 2.75" piston size which provide incredible stopping power
  • 11.75" OD vented rotors which are .81" thick ensure cool operation for fade free braking performance
  • This complete kit includes calipers, rotors, brake pads, brake hats, caliper slide bolts, and caliper brackets
  • The 3" backspace steel brake hat accommodates 5 on 4-1/2, 4-3/4", and 5 on 5" bolt circles

Comes as a Kit

Key Specs

Bolt PatternMulti: 5 on 4.5" | 4.75" | 5"
Rotor Diameter11.75 Inch
Rotor TypeVented
Caliper PistonsOne

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Speedway Motors 91031936 Details

Replace those old drum brakes with modern rear disc brakes. Steel rotor hat mounts .81" x 11-3/4" Pro-lite vented iron rotors and calipers to 3" tube rear end.  Complete with rotors, hats, calipers (7/16"-20 inlets), brackets, brake pads, caliper brackets and slider bolts. 

Pro-Lite Vented Brake Rotor, 11.75 x .81 Inch

Every rotor is cast from premium grade, long grain carbon iron which exhibits long wear, high thermal stability, and excellent resistance to distortion in high heat. Modern foundry and machining techniques hold close tolerances on face and vane thickness. Combining the correct face thickness with a 32 vane casting provides superior heat management and long service life with low rotating and unsprung weight. The straight vane design also makes it possible to use the same rotor on left or right hand mounting locations.

  • Thickness: GM .810"
  • Outside Diameter: 11.75"
  • # Holes: 8
  • Bolt Circle: 7"
  • Thread: Thru
  • Weight: 8.00 lbs

Speedway Stamped Steel Disc Brake Rotor Hat, 3 Inch Offset

Stamped steel hat with all three bolt patterns: 5 on 4-1/2", 5 on 4-3/4", and 5 on 5" bolt circle patterns. Weighs just 2 lbs

  • Rotor Bolt Circle:  7" x 8 holes
  • 3.00" offset
  • 3.05" diameter center hole
  • 5.83" I.D. clearance
  • Stud Hole Diameter: 1/2"
  • Rotor Mount Bolt Hole: .325"

Note: Failure to follow the installtion instructions will result in damage to the brake hat and will result in excess run out of the rotor

Rotor Hat Bolt Set, 1/8 Inch Thick

  • Ultralight, 5/16-24 thread
  • Set of 8
  • With self-locking nuts.

1969-77 GM Midsize Standard Stock Disc Brake Calipers

1969-77 mid and full size GM style caliper is a standard full size GM caliper used for years on many vehicles (1969-72 Chevelle, 73-77 A-Body, 1969-1981 Camaro, 1977 Caprice, S-10 pickups, etc). It will fit any bracket / spindle designed for the large GM calipers (7” mount width). 

  • 7/16"-20 inlet so you can use the readily available brake hoses and hardware from Pre-1978 GM midsize cars
  • IMCA approved
  • Fits 1" thick rotor. 2.8" diameter pistons installed
  • Has 7-1/16" center to center mounting holes
  • The width between mounting tabs is 2-3/4"
  • Depending on the spindle and rotor size it will not fit in most 14” wheels (nor in 15” drum brake wheels)

Speedway GM Brake Caliper Slider Slide Bolt

  • The overall length of these slide bolts is 4-3/8"
  • The underhead length is 3-3/8"
  • The thread on the bolts is 7/16-20 (US fine)

Speedway 156 1969-77 GM Mid-Size Brake Pads


  • Aluminum/Steel rotors
  • Best pad for aluminum rotors
  • Low metallic, long life, excellent Street performance

Weld-On 1969-77 GM Mid-size Caliper Bracket

  • Mounts 1969-1977 GM mid-size car front caliper to any 3" tube rear end using 11-3/4" diameter rotors
  • Fully machined steel with punched lightening holes
  • Measures approximately 7" between mounting holes


Kit Includes:

(2) 11.75" Rotors

(2) Brake Rotor Hats

(2) Rotor Hat Bolt Kit

(1) LH Caliper

(1) RH Caliper

(4) Slider Bolts

(2) Pairs of Brake Pads

(2) Mid-size Caliper Bracket

(1) Instruction Sheet


Speedway Motors 91031936 Specifications

MFG. Part #91031936
BrandSpeedway Motors
Bolt PatternMulti: 5 on 4.5" | 4.75" | 5"
Rotor Diameter11.75 Inch
Rotor TypeVented
Caliper PistonsOne
Caliper FinishNatural
Parking Brake ProvisionNo
Rotor ShapeRound
Hardware IncludedYes
Front Rotor IncludedNo
Front Caliper IncludedNo
Rear Caliper IncludedYes
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo
Rear Rotor IncludedYes
Speedway Motors Catalog Part #910-31936
Rotor Hat Bolt Pattern8 x 7.00"
Rotor Thickness.81"
Rotor Backspace3.00"
Thread Pitch7/16"-20
Centerline of Holes7.00"
Sold in QuantityKit
NotesIncludes rotors, rotor hats, caliper brackets, calipers, pads, and hardware.
Rotor Material TypeCast Iron