Wilwood Pad Set TX1 6617 W6A /W4A AERO 4/6 (.670in Thk)

High-Temperature TX1 Racing Compound for Wilwood W6A, W4A, Aero 4, and Aero 6 Calipers

The Wilwood 150-TX1-6617K TX1 brake pad set is a high-temperature racing compound designed for the 6617 pad shape used across Wilwood's W6A Radial Mount, W4A Radial Mount, Aero4, Aero4-DS, Aero6, Aero6-DS, and AeroDM lug-mount calipers. TX1 is one of Wilwood's most popular road racing and high-performance street-track compounds, offering very high friction in the upper temperature range with consistent bite from cold and manageable fade characteristics at sustained high temperatures. It delivers strong, linear pedal feel on track and remains drivable during street warm-up laps where other dedicated race compounds become unpredictable below operating temperature.

Key Features

• Wilwood 150-TX1-6617K TX1 compound, axle set (front or rear pair)
• Designed for W6A, W4A, Aero4, Aero4-DS, Aero6, Aero6-DS, and AeroDM caliper applications
• Very high friction compound optimized for temperatures above 600 degrees F
• Consistent initial bite from cold with manageable warm-up behavior for street-track use
• 0.670 inch pad thickness (6617 shape)
• High wear resistance for extended track session pad life
• Compatible with Quick-Silver and Quick-Silver/ST caliper variants
• Axle set quantity covers one axle end (two calipers front or rear)

Specifications

What's Included

• 1 axle set of Wilwood TX1 compound brake pads in 6617 shape
• Anti-squeal shims (if applicable per Wilwood packaging)

About Wilwood

Wilwood Disc Brakes has designed and manufactured high-performance braking systems in Camarillo, California since 1977. Wilwood supplies brake components for circle track, road racing, drag racing, and street performance applications. The TX1 compound is part of Wilwood's PolyMatrix brake pad series, engineered to meet the specific temperature, friction, and fade requirements of track-day and competition use on vehicles running Wilwood caliper kits.

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Frequently Asked Questions

The Wilwood 150-TX1-6617K is an axle set of TX1 compound brake pads in the 6617 pad shape at 0.670-inch thickness, designed for Wilwood W6A, W4A, Aero4, Aero4-DS, Aero6, Aero6-DS, and AeroDM calipers. TX1 is a high-temperature road racing and street-track compound that operates optimally above 600 degrees F with strong friction and good fade resistance at sustained track temperatures.

The 6617 pad shape is used in multiple Wilwood caliper families: W6A Radial Mount and its Quick-Silver and Quick-Silver/ST variants, W4A Radial Mount and its variants, Aero4, Aero4-DS, Aero6, Aero6-DS, and AeroDM lug-mount calipers. Confirm your specific caliper part number against Wilwood's pad compatibility chart before ordering to ensure exact fitment.

TX1 is a dual-purpose compound best suited for drivers who run track days with street warm-up laps. It has reasonable initial bite when cold compared to full race-only compounds, but it performs optimally at elevated temperatures above 600 degrees F. For purely street-driven applications without regular track use, a lower-temperature compound like BP-10 or PolyMatrix E may provide more consistent everyday feel.

TX1 is classified by Wilwood as a high-temperature compound, operating effectively at sustained temperatures above 600 degrees F and maintaining friction through the 1,000-1,300 degree F range typical of asphalt road racing. For drag race, dirt track, or pure street applications typically operating below 500-600 degrees F, a medium-temperature compound may provide more consistent feel.

An axle set covers one axle end and includes the pad quantity required for two calipers at that position (front or rear). For a full vehicle set covering both front and rear axles, two separate axle sets are required. Confirm whether you need front-only, rear-only, or a complete four-corner kit for your application.

Yes. The 6617 pad shape and TX1 compound are listed as compatible with W6A Quick-Silver, W6A Quick-Silver/ST, W4A Quick-Silver, and W4A Quick-Silver/ST caliper variants in addition to the standard radial mount versions. Quick-Silver designates a Wilwood feature upgrade, not a change in pad shape.

Yes. All performance brake compounds, including TX1, benefit from a proper bedding procedure to transfer an even layer of pad material to the rotor surface. A standard bedding procedure involves a series of progressive stops from moderate to high speed with cooling intervals between runs. Avoid hard emergency stops before bedding is complete to prevent uneven pad deposit and vibration.

TX1 is designed primarily for use with cast iron rotors, which are standard on Wilwood brake kit applications. Consult Wilwood technical support before using TX1 compound with carbon-ceramic composite rotors, as high-friction compounds optimized for iron can cause accelerated wear or surface damage on carbon-ceramic rotor materials.

Installation Instructions

1. Confirm your caliper uses the 6617 pad shape and is compatible with the W6A, W4A, Aero4, Aero6, or AeroDM families before installing 150-TX1-6617K.
2. Clean caliper bracket and piston faces of any old pad material and brake dust.
3. Inspect rotors for minimum thickness, scoring, and heat cracks before installing fresh pads.
4. Install new TX1 pads into caliper bracket and confirm pads slide freely without binding.
5. Reassemble caliper onto bracket and torque caliper bolts to Wilwood specification.
6. Pump brake pedal to seat pads against rotor before driving.
7. Perform a proper bedding procedure: 5-8 progressive stops from 40-60 mph with cooling intervals before committing to full track use.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.