Tuesday, July 22, 2014
Hat No: 170-9493
Parking Brake Hats

Parking Brake Hat - Standard
Wilwood Parking Brake Hat - Standard Hat

Wilwood Parking Brake Hat - Standard Hat zoom image
These premium grade cast iron hats are used with Wilwood's internal shoe parking brake kits. Each hat is a precision machined, threaded hole design for use in conjunction with through-hole mount rotors. After machining, the hats are electro-coated for corrosion resistance.    Continue >>

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Product Number: 170-9493     Price: $170.58
Parking Brake Hat - Standard - Product Summary
Hat Dimensions
Mount Hole Type: Rotor Bolt Circle (in): Hat Offset (in): Center Reg. (in):
Threaded 12 x 8.75 1.95 3.06
Hat Type
Material: Mount Style: Finish: Weight (Lbs.):
Iron Fixed Mount Black E-Coat 10
Bolt Circle Dimensions
Hat Bolt Circle 1: Hat Bolt Circle 2: Hat Bolt Circle 3:
5 x 4.50 5 x 4.75 5 x 5.00
Application Info
Application Note: Hat Bolt Kit Part #:
BB Parking Brake Kits 230-8217
Cautionary Info
Application Note:
Rotor Hat Applications
Driving EnvironmentVehicle Sub-TypesApplication Duty
Street Rods  Heavy Duty
Street Performance DomesticHeavy Duty
Rally Heavy Duty
Off Road Heavy Duty
Rotor Hat Dimensions
Parking Brake Hat - Standard Hat Drawing

Parking Brake Hat - Standard Hat Drawing zoom image
Additional Hat Dimensions
Rotor Mount Hole Size (in): 1/4-28
Shoe I.D. (in) 7.23
Clearance I.D. (in): 6.85
Face Thickness (in): 0.18
Hat Stud Diamenter - BC 1 (in): 0.52
Hat Stud Diamenter - BC 2 (in): 0.52
Hat Stud Diamenter - BC 3 (in): 0.52
Additional Notes:
3.06 " diameter register with counterbore for register ring.
Wilwood Compatible Rotors: Parking Brake Hat - Standard
C/SiC Rotors
Wilwood C/SiC Rotors

Wilwood C/SiC Rotors zoom image
Rotor Diameter Range: Rotor Width Range:
14 1.1 1.25
Wilwood's C/SiC rotors are made form a proprietary blend ceramic matrix composite material commonly known as Carbon-Ceramic. C/SiC rotors offer higher thermal conductivity and heat capacity in excess of conventional iron or titanium rotors of similar or even greater weight. Developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this composite is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. View C/SiC Rotors
Drilled Steel Dynamic Mount Rotor
Wilwood Drilled Steel Dynamic Mount Rotor

Wilwood Drilled Steel Dynamic Mount Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
12.9 0.38
Steel rotors have applications in all types of motorsports. Steel rotors provide a durable lightweight option in applications where sustained temperatures remain in the low to moderate range, and high heat spikes are only observed on an intermittent basis. This could be anything from a hard stopping drag race car at the end of a quarter mile, or a high speed stock car coming in from a qualifier at a super speedway. Steel rotors can also be found in lighter weight open wheel cars such as sprints and modifieds, and a variety of light weight, open wheel road course racers. A special alloy and proprietary manufacturing processes give these rotors high resistance to thermal distortion with excellent friction and wear characteristics against the pads. View Steel Rotors
GT 32 Curved Vane Rotor
Wilwood GT 32 Curved Vane Rotor

Wilwood GT 32 Curved Vane Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
15 1.25
GT-32 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 36 Straight Vane Rotor
Wilwood GT 36 Straight Vane Rotor

Wilwood GT 36 Straight Vane Rotor
Rotor Diameter Range: Rotor Width Range:
14 0.81
GT-36 straight vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT-36 rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 36 Straight Vane Rotor
Wilwood GT 36 Straight Vane Rotor

Wilwood GT 36 Straight Vane Rotor
Rotor Diameter Range: Rotor Width Range:
14 0.76
GT-36 straight vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT-36 rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 48 Curved Vane Rotor
Wilwood GT 48 Curved Vane Rotor

Wilwood GT 48 Curved Vane Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
12.88 0.81 1.1
GT-48 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 48 Curved Vane Rotor
Wilwood GT 48 Curved Vane Rotor

Wilwood GT 48 Curved Vane Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
12.88 13.06 1.25
Wilwood's GT 48 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Combined with our proven GT Series asymmetrical face slot pattern and individual dynamic balancing, you are assured the smoothest, vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition. View GT Rotors
GT 72 Curved Vane Rotor
Wilwood GT 72 Curved Vane Rotor

Wilwood GT 72 Curved Vane Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
14 14.25 1.1 1.25
Wilwood's GT 72 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Combined with our proven GT Series asymmetrical face slot pattern and individual dynamic balancing, you are assured the smoothest braking available. View GT Rotors
HD 48 Curved Vane Rotor
Wilwood HD 48 Curved Vane Rotor

Wilwood HD 48 Curved Vane Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
12.88 13.06 1.25
Wilwood's HD 48 Curved Vane Spec-37 rotors are are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Our HD Series preparation includes full detail machining and smooth pad contact faces without slots. View HD Rotors
SRP Drilled Performance Rotor
Wilwood SRP Drilled Performance Rotor

Wilwood SRP Drilled Performance Rotor
Rotor Diameter Range: Rotor Width Range:
14 0.81
SRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build-up on the rotor faces resulting in smoother engagement and improved pedal response in all conditions. The material removed also contributes to lower rotating and unsprung suspension weight. View SRP Rotors
SRP Drilled Performance Rotor
Wilwood SRP Drilled Performance Rotor

Wilwood SRP Drilled Performance Rotor
Rotor Diameter Range: Rotor Width Range:
14 0.76
SRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build-up on the rotor faces resulting in smoother engagement and improved pedal response in all conditions. The material removed also contributes to lower rotating and unsprung suspension weight. View SRP Rotors
SRP Drilled Performance Rotor
Wilwood SRP Drilled Performance Rotor

Wilwood SRP Drilled Performance Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
12.88 15 0.75 1.25
SRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build-up on the rotor faces resulting in smoother engagement and improved pedal response in all conditions. The material removed also contributes to lower rotating and unsprung suspension weight. View SRP Rotors
SRP Drilled Performance Rotor
Wilwood SRP Drilled Performance Rotor

Wilwood SRP Drilled Performance Rotor zoom image
Rotor Diameter Range: Rotor Width Range:
12.88 14 1.1
SRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build-up on the rotor faces resulting in smoother engagement and improved pedal response in all conditions. The material removed also contributes to lower rotating and unsprung suspension weight. View SRP Rotors