Hawk Performance HB521D.650 ER-1 Endurance Racing Motorsport Brake Pad Set

Hawk Performance HB521D.650 ER-1 race brake pads for the axle it is cataloged for. Cataloged as a motorsport pad shape rather than to a specific vehicle, so it is selected by caliper and pad dimensions.

• Compound: Hawk ER-1, an endurance racing compound
• Manufacturer part number: HB521D.650
• Built for long-run endurance racing duty
• Consistent friction output over extended sessions
• Sold as one complete pad set

About the ER-1 compound

The ER-1 friction material is an endurance racing compound built for competition use rather than quiet daily commuting. It is chosen by drivers who need repeatable torque once the brakes are hot, clean release off the pedal, and a friction level they can balance against the other axle. Expect race-pad behavior: more noise and more dust than a street pad, and a warm-up period before the compound reaches its working range.

Inspect rotor thickness and caliper hardware while the pads are out, and bed the new set in following the pad maker's procedure before hard use. Fitment for race pads is driven by caliper and pad shape, so verify your caliper against the listed application if your car has been modified or wears a non-original brake package.

Confirm fitment by year, trim, and brake package before ordering.

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