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11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper
11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper

11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper

74-78 Ford Mustang II, 74-80 Ford Pinto, 75-80 Mercury Bobcat, Oval Track Cars, Front Position

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11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper
11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper
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Part # 91031070
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Rotor Shape:
Rotor Diameter:
11 Inch
Rotor Type:
Rotor Style:
Plain Face
Rotor Material Type:
Cast Iron
Rotor Finish:
Rotor Thickness:
Bolt Pattern:
5 on 4.75"
Stud Length:
Stud Diameter:
20.65 lbs.
MFG. Part #:
Sold in Quantity:


This rotor allows the use of GM Metric calipers along with a GM car bolt pattern. Vented stock 11" diameter brake rotors for 1974-1980 Mustang II, Pinto, or Bobcat spindles (or popular GM Metric calipers and brackets). Brake rotors are new, not plugged or re-drilled. Has a 5 on 4-3/4" bolt pattern with corresponding 7/16" diameter fine thread wheel studs.
  • 5 on 4.75" Bolt circle
  • Granada type rotor
  • For use with popular GM Metric calipers and brackets
  • Bearing and seal kit sold separately (910-31052)


Proper Break-In Procedure for Steel or Cast Iron Rotors

New steel/iron rotors should be bedded in before being used in racing conditions. Proper bedding will prepare the rotor surface, prolong the rotor's life, and make it more resistant to thermal checking or cracking under severe braking conditions. The following procedures should be performed when bedding in both steel and cast iron rotors. It is best to bed in a new rotor using a used set of pads, preferably ones which will not create heat rapidly. Generating heat too rapidly will thermal shock the rotors. Likewise, when bedding in a new set of brake pads it is best to perform the process on a used rotor. This new/used bedding process permits controlled bedding of each individual component.

Make sure rotor surfaces are free from oils, grease, and brake fluid. Run vehicle up to a moderate speed and make several medium deceleration stops to heat up the rotor slowly. This will help reduce the chance of thermal shock caused by uneven heating of the rotor. Pull into the pits and allow the rotor to cool to ambient air temperature. Care should be taken not to ride the brakes into the pits as this may hot spot the rotor causing premature wear to the surface or structural damage.


STUDS 91005908(.565 KNURL X 1.34 LG) CUP 912TL68110 CUP 912TLM12710 (SEAL 912S19221 NOT INCLUDED) (STUD 54546160 .560 KNURL X 2-7/8)
Some parts are not legal for use in California or other states with similar laws/regulations

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  • After getting the control arms and drop spindles installed last time, we are dying to see what it looks like on the ground. Today we are working with the Speedway Deluxe Disc Brake Kit. Josh and Joe are on a roll!

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