Hawk HB521U.800 DTC-70 Race Pads Wilwood Superlite SL 4/6 Forged 0.800 Thick

Vehicle Fitment

• Universal fitment - designed for any race vehicle equipped with compatible Wilwood Superlite or AP Racing calipers using the 0.800" pad thickness.
• Wilwood Superlite 4R (part# 7420) - compatible
• Wilwood Superlite 6R (part# 7420) - compatible
• Wilwood Superlite SL4R (part# 7420) - compatible
• Wilwood Superlite ST (part# 7420) - compatible
• Wilwood Superlite 4/6 Forged (part# 7420) - compatible
• Wilwood Forged Superlite Internal - compatible
• AP Racing CP8250 - compatible
• AP Racing (Essex) CP8350 series (24S4L through 33S4L) - compatible
• CompBrake Pro Race One - compatible
• StopTech ST-43 - compatible

Fitment Notes

• Universal caliper-specific fitment - not assigned to any particular vehicle make, model, or axle position.
• Pad thickness is 0.800 in. - confirm your caliper's required pad thickness before ordering; the HB521 shape is also available in 0.650 in. for other caliper configurations.
• Some caliper applications may require drilling a center mounting hole - consult Hawk's Specialty Caliper Guide to confirm your specific setup.
• For race and high-performance driving events only - not suitable for street daily driving.
• Not compatible with carbon ceramic rotors; designed for iron/metal rotors only.
• Requires a proper race bed-in procedure after installation before competitive use.

Features

• DTC-70 compound is Hawk's highest-torque race pad - engineered with extremely aggressive initial bite for the maximum deceleration rates demanded by serious circuit racing.
• Exceptional torque control with superb modulation and release characteristics - delivers predictable, consistent braking even at extreme operating temperatures.
• Superior pad and rotor wear life for a top-tier race compound - well-suited to both sprint and endurance racing formats.
• High temperature operating range of 400-1600°F with an optimal window of 800-1200°F - built for sustained, repeated heavy braking at professional circuit speeds.
• Proven in NASCAR, ARCA, Sports Car/GT, Open Wheel/Formula, and monster truck competition.
• Works as a standalone race solution or in split-friction setups with DTC-60 on the rear axle.
• Backed by Hawk's limited lifetime warranty against manufacturing defects.

Specifications

• Part Number: HB521U.800
• Compound: DTC-70 (U)
• Pad Thickness: 0.800 in.
• Caliper Compatibility: Wilwood Superlite SL/BB SL series (7420); AP Racing CP8250 / CP8350; CompBrake Pro Race One; StopTech ST-43
• Material: Ferro-Carbon
• Operating Temperature Range: 400-1600°F
• Optimal Temperature Range: 800-1200°F
• Hardware Included: No

Included Components

• 4x DTC-70 Race Brake Pads (full set for one caliper - all four pad positions)

Product Description

The Hawk HB521U.800 DTC-70 brake pads are purpose-built for the Wilwood Superlite SL and BB SL caliper family (part# 7420) and select AP Racing CP8250/CP8350, CompBrake Pro Race One, and StopTech ST-43 calipers - all in the 0.800" pad thickness configuration. As Hawk's most aggressive and highest-torque motorsport compound, the DTC-70 is engineered for cars competing at the absolute limit: high-speed, high-downforce race vehicles demanding maximum deceleration rates with controllable, consistent brake feel under repeated hard stops.

The DTC-70's extreme initial bite, outstanding torque control, and superior modulation characteristics have made it a go-to choice across NASCAR, ARCA, Sports Car/GT, and open-wheel racing. Many racers of heavier, more powerful cars pair DTC-70 up front with DTC-60 on the rear axle for an optimal split-friction balance. Due to the compound's high optimal temperature window of 800-1200°F, proper heat cycling and a thorough race bed-in procedure are mandatory before competitive use. These pads are not intended for street driving under any circumstances.