Monday, December 05, 2016
Brake Pad Part No: 15B-9978K

Brake Pad Guide Brake Pads Chart

Brake Pads
High-Temperature Racing Pads

Pad#:   6617
Compound:   PolyMatrix B
Wilwood Brake Pad Plate #6617

Wilwood Brake Pad Plate #6617
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Product Number: 15B-9978K     Price: $205.22
Pad Dimensions
Thickness(in): Area(in²): Volume(in³): Beded:
.67 11 5.2 N
Temperature & Friction Ratings
Peak Temperture Rating: Peak Friction Rating:
1300+ F. 0.62
Dust & Noise Ratings
Dust Production Rating: Pad Noise Rating:
N-A N-A

Performance Characteristics
  • Medium-high friction, good cold response
  • Gently rising torque curve, predictable engagemnet
  • Low wear rate at medium temperatures, increasing to moderate at high temperature.
  • Medium-high friction, good cold response

Vehicle Applications
Driving EnvironmentVehicle Sub-TypesApplication Duty
Rally Heavy Duty
Road Race Heavy Duty
Late Model Asphalt ASA, All Pro, SW Tour, etc...Heavy Duty
Stock Cars NASCAR, BGN, CTS, ARCA, etc... Medium Duty
Late Model Dirt STARS, UMP, IMCA, etc...Heavy Duty
Northeast Modified Dirt or PavementHeavy Duty
Open Wheel Sprint, Midget, etc… Dirt or PavementHeavy Duty
Off Road Heavy Duty

Pad Illustration and Dimensions
Wilwood Brake Pad Plate #6617 Large Drawing

Wilwood Brake Pad Plate #6617 Large Drawing


Compound Characteristics
PolyMatrix B

PolyMatrix B


Compound Data Sheet
Application:

  • Race ONLY compound is a value priced, proven workhorse for most weekly category asphalt late models, sprints, modifieds, and sportsman divisions.
  • Hard braking dirt late models, DIRT modifieds, and rear inboard sprint brakes with vented iron or steel rotors.
  • SCCA club racers, rally, and auto-cross.
  • High MPH drag cars if high end fade occurs with lower temperature pads.
Characteristics:

  • Traditional favorite for asphalt LM's, modifieds, and sprints.
  • Modifieds, late models, and other hard braking dirt applications.
  • Intermediate weight road course, auto-cross, rally.
  • Beds easily and fully compatible with all iron and steel.
Compound Temperature Range & Torque Values
Temperature range and overall friction value are the primary considerations for pad selection. The pads must be capable of maintaining the proper amount of friction for stopping power within the temperatures that will be realized on the track during the event. Then, overall wear rate must be considered. For most asphalt and road race applications, compounds in the high temperature ranges over 1000°F range are usually necessary. Dirt track, drag race, and street performance applications usually operate at temperatures between 500° and 1000°F. Keep in mind that these are general ranges, and not absolute values. Many factors and unforeseen influences can affect brake temperatures. The best indicator for pad selection will always be on track performance. If pad fade (friction loss) due to overheating occurs, then improved cooling, a heavier rotor, or a higher temperature range pad may all become necessary.

Wilwood Compatible Calipers: Pad # 6617
Aero4 Radial Mount
Wilwood Aero4 Radial Mount Caliper

Wilwood Aero4 Radial Mount Caliper
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Aero4 Radial Mount Caliper

The new Aero4 forged four piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, multiple options for piston volume, and a rotor diameter ranging from 12.88" to 15.00" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. The new Aero4 is the latest innovation to the W4A / W6A series of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes and massive center bridge assembly. View Aero4 Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 1.98 4.84 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
Aero4 Radial Mount
Wilwood Aero4 Radial Mount Caliper

Wilwood Aero4 Radial Mount Caliper
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Aero4 Radial Mount Caliper

The new Aero4-ST Quick-Silver forged four piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, multiple options for piston volume, and a rotor diameter ranging from 12.88" to 15.00" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. The new Aero4 is the latest innovation to the W4A / W6A series of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes and massive center bridge assembly. Equipped with Thermlock piston technology and Wilwood’s Quick-Silver Nickel coating. QS-ST calipers utilizing the new .80” thick 6620 pad plate, give extra pad life for high heat endurance racing View Aero4 Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 1.98 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.1 15
Aero6 Radial Mount
Wilwood Aero6 Radial Mount Caliper

Wilwood Aero6 Radial Mount Caliper
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Aero6 Radial Mount Caliper

The new Aero6 forged six piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, multiple options for piston volume, and a rotor diameter ranging from 12.88" to 15.00" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. The new Aero4 is the latest innovation to the W4A / W6A series of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes and massive center bridge assembly. View Aero6 Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 5.40 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W4A Radial Mount
Wilwood W4A Radial Mount Caliper

Wilwood W4A Radial Mount Caliper
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W4A Radial Mount Caliper

The W4A forged four piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and a rotor diameter ra View W4A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 2.46 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.1 14.25
W4A Radial Mount
Wilwood W4A Radial Mount Caliper

Wilwood W4A Radial Mount Caliper
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W4A Radial Mount Caliper

The W4A forged four piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and a rotor diameter ranging from 12.19" to 14.25" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W4A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 3.56 4.84 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 14.25
W4A Radial Mount
Wilwood W4A Radial Mount Caliper

Wilwood W4A Radial Mount Caliper
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W4A Radial Mount Caliper

The W4A forged four piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, four options for piston volume, and a newly increased rotor diameter ranging from 12.19" to 15.00" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W4A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 1.98 4.84 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W4A Radial Mount -Quick-Silver
Wilwood W4A Radial Mount -Quick-Silver Caliper

Wilwood W4A Radial Mount -Quick-Silver Caliper
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W4A Radial Mount -Quick-Silver Caliper

Quick-Silver series W4AR nickel plated forged billet four piston calipers provide matched bias rear braking for use in conjunction with the W6AR front calipers. W4AR calipers incorporate race technology into a radial mount body design with widespread adaptability and an expanded rotor compatibility range from 12.19” to 15.00”, including update options for all W4AR Big Brake kits. Stainless steel pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Two high performance street, and four high-temp race only brake pad compounds in the 6617 pad type, allow precise tuning of the brake response, friction requirements and temperature range for all types of high performance and competition applications. View W4A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 1.98 2.46 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W4A Radial Mount -Quick-Silver/ST
Wilwood W4A Radial Mount -Quick-Silver/ST Caliper

Wilwood W4A Radial Mount -Quick-Silver/ST Caliper
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W4A Radial Mount -Quick-Silver/ST Caliper

Quick-Silver / ST series W4AR/ST nickel plated forged billet calipers, with four Thermlock pistons, deliver championship proven performance with heavy duty stopping power and reliability for sustained high heat competition. W4AR/ST calipers incorporate race technology into a radial mount body design with widespread adaptability and an expanded rotor compatibility range from 12.19” to 15.00”, including track update options for all W4AR Big Brake kits. Thermlock pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Four high-temp race only brake pad compounds in the 6617 pad type allow precise tuning of the brake response, friction requirements and temperature range for all types of high performance and competition applications. View W4A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 1.98 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W4A Radial Mount-ST
Wilwood W4A Radial Mount-ST Caliper

Wilwood W4A Radial Mount-ST Caliper
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W4A Radial Mount-ST Caliper

The W4A/ST forged four piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and a rotor diameter ranging from 12.19" to 14.25" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W4A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
4 3.90 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 14.25
W6A Radial Mount
Wilwood W6A Radial Mount Caliper

Wilwood W6A Radial Mount Caliper
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W6A Radial Mount Caliper

The W6A forged six piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and a redisigned rotor diameter range from 12.19" to 15.00" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W6A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 5.40 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W6A Radial Mount
Wilwood W6A Radial Mount Caliper

Wilwood W6A Radial Mount Caliper
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W6A Radial Mount Caliper

The W6A forged six piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and a rotor diameter ranging from 12.19" to 14.25" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W6A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 5.40 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 14.25
W6A Radial Mount-Quick-Silver
Wilwood W6A Radial Mount-Quick-Silver Caliper

Wilwood W6A Radial Mount-Quick-Silver Caliper
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W6A Radial Mount-Quick-Silver Caliper

Quick-Silver series W6AR nickel plated forged billet six piston calipers deliver heavy duty stopping power and reliability for the road or track. W6AR calipers incorporate race technology into a radial mount body design with widespread adaptability and an expanded rotor compatibility range from 12.19” to 15.00”, including update options for all W6AR Big Brake kits. Stainless steel pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Two high performance street, and four high-temp race only brake pad compounds in the 6617 pad type, allow precise tuning of the brake response, friction requirements and temperature range for all types of high performance and competition applications. View W6A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W6A Radial Mount-Quick-Silver/ST
Wilwood W6A Radial Mount-Quick-Silver/ST Caliper

Wilwood W6A Radial Mount-Quick-Silver/ST Caliper
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W6A Radial Mount-Quick-Silver/ST Caliper

Quick-Silver / ST series W6AR/ST nickel plated forged billet calipers, with six Thermlock pistons, deliver championship proven performance with heavy duty stopping power and reliability for sustained high heat competition. W6AR/ST calipers incorporate race technology into a radial mount body design with widespread adaptability and an expanded rotor compatibility range from 12.19” to 15.00”, including track update options for all W6AR Big Brake kits. Thermlock pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Four high-temp race only brake pad compounds in the 6617 pad type allow precise tuning of the brake response, friction requirements and temperature range for all types of high performance and competition applications. View W6A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15
W6A Radial Mount-ST
Wilwood W6A Radial Mount-ST Caliper

Wilwood W6A Radial Mount-ST Caliper
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W6A Radial Mount-ST Caliper

The W6A/ST forged six piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and a rotor diameter ranging from 12.19" to 14.25" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W6A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 14.25
W6A Radial Mount-ST
Wilwood W6A Radial Mount-ST Caliper

Wilwood W6A Radial Mount-ST Caliper
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W6A Radial Mount-ST Caliper

The W6A/ST forged six piston caliper delivers heavy duty stopping power for the road or track. The caliper incorporates race technology into a body design with widespread adaptability. Radial mounting, two options for piston volume, and are designed rotor diameter range from 12.19" to 15.00" give this caliper the versatility necessary to suit all types of heavy weight braking requirements. View W6A Calipers
Caliper Dimensions
Piston Count: Piston Area Range (in²): Pad Area Range (in²):
6 4.04 11
Pad Volume Range (in³): Max Rotor Widths (in): Max Rotor Diameters (in):
5.2 1.28 15