Brake Pad Part No: 15a-9977k

Call (805) 388-1188
High-Temperature Racing Pads :  Pad#:  6617
Compound:  PolyMatrix A
Prod #: 15A-9977K
Price: $219.93

Pad Dimensions
Thickness(in) .67
Area(in²) 11.1
Volume(in³) 5.2
Beded N
Temperature & Friction Ratings
Peak Temperture Rating 1300+ F.
Peak Friction Rating 0.68
Dust & Noise Ratings
Dust Production Rating N-A
Pad Noise Rating N-A
Performance Characteristics
  • Ultimate high friction pad with aggressive initial response
  • Immediate low tempeature response.
  • Low wear rate
  • Ultimate high friction pad with aggressive initial response
Vehicle Applications
Driving Environment Rally
Vehicle Sub-Types
Application Duty Heavy Duty
Driving Environment Road Race
Vehicle Sub-Types
Application Duty Heavy Duty
Driving Environment Late Model Asphalt
Vehicle Sub-Types ASA, All Pro, SW Tour, etc...
Application Duty Heavy Duty
Driving Environment Stock Cars
Vehicle Sub-Types NASCAR, BGN, CTS, ARCA, etc...
Application Duty Heavy Duty
Driving Environment Late Model Dirt
Vehicle Sub-Types STARS, UMP, IMCA, etc...
Application Duty Heavy Duty
Driving Environment Northeast Modified
Vehicle Sub-Types Dirt or Pavement
Application Duty Heavy Duty
Driving Environment Open Wheel
Vehicle Sub-Types Sprint, Midget, etc… Dirt or Pavement
Application Duty Heavy Duty
Driving Environment Off Road
Vehicle Sub-Types
Application Duty Heavy Duty

Compound Characteristics



Compound Data Sheet
Use & Caution
  • Ultimate high friction pad with aggressive initial response
  • Immediate low tempeature response.
  • Low wear rate
  • Ultimate high friction pad with aggressive initial response
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

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98 4.84
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

Aero4 Radial Mount Calipers

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
Aero4 Radial Mount

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.1
Max Rotor Diameters (in) 15

Aero4 Radial Mount Calipers

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
Aero4 Radial Mount

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.1
Max Rotor Diameters (in) 15

Aero4 Radial Mount Calipers

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
Aero4-DS Radial Mount

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.1
Max Rotor Diameters (in) 15

Aero4-DS Radial Mount Calipers

The new Aero4-DS 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 Aero6-DS is the latest innovation to the Aero series of calipers incorporating an exclusive dust wiper seal that further protects the piston bore from dust and corrosion, allowing the caliper to be used in locales that mandate a method of environmental sealing. View Aero4-Dust Seal Calipers
Aero6 Radial Mount

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04 5.40
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

Aero6 Radial Mount Calipers

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
Aero6-DS Radial Mount

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04 5.40
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

Aero6-DS Radial Mount Calipers

The new Aero6-DS 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 Aero6-DS is the latest innovation to the Aero series of calipers incorporating an exclusive dust wiper seal that further protects the piston bore from dust and corrosion, allowing the caliper to be used in locales that mandate a method of environmental sealing. View Aero6-Dust Seal Calipers
W4A Radial Mount

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 2.46
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.1
Max Rotor Diameters (in) 14.25

W4A Radial Mount Calipers

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
W4A Radial Mount

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 3.56 4.84
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 14.25

W4A Radial Mount Calipers

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
W4A Radial Mount

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98 4.84
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W4A Radial Mount Calipers

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
W4A Radial Mount -Quick-Silver

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98 2.46
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W4A Radial Mount -Quick-Silver Calipers

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
W4A Radial Mount -Quick-Silver/ST

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 1.98
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W4A Radial Mount -Quick-Silver/ST Calipers

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
W4A Radial Mount-ST

Caliper Dimensions
Piston Count 4
Piston Area Range (in²) 3.90
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 14.25

W4A Radial Mount-ST Calipers

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
W6A Radial Mount

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04 5.40
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W6A Radial Mount Calipers

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
W6A Radial Mount

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04 5.40
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 14.25

W6A Radial Mount Calipers

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
W6A Radial Mount-Quick-Silver

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W6A Radial Mount-Quick-Silver Calipers

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
W6A Radial Mount-Quick-Silver/ST

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W6A Radial Mount-Quick-Silver/ST Calipers

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
W6A Radial Mount-ST

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 14.25

W6A Radial Mount-ST Calipers

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
W6A Radial Mount-ST

Caliper Dimensions
Piston Count 6
Piston Area Range (in²) 4.04
Pad Area Range (in²) 11.1
Pad Volume Range (in³) 5.2
Max Rotor Widths (in) 1.28
Max Rotor Diameters (in) 15

W6A Radial Mount-ST Calipers

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





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