Hardrace Pillow Ball Bush Replacement Package – Subaru BRZ / Toyota 86 (RP-7372-PL) For Hardrace #7372

Product Overview

The Hardrace Pillow Ball Bush Replacement Package (RP-7372-PL) is a dedicated overhaul kit engineered specifically to refresh and rebuild Hardrace’s popular adjustable front control arms (7372). Available at JDMaster.net, this high-strength service pack supplies a premium replacement spherical rose joint assembly complete with high-hardness metal races and protective shielding. Instead of retiring a set of structurally perfect alloy arms, this replacement package allows you to seamlessly press in fresh, zero-tolerance motorsport pivots—fully restoring the telepathic steering response, rigid structural integrity, and unshakeable cornering precision of your front suspension layout.

Key Features & Benefits

• Tailored for Hardrace Arm #7372: Precision-machined to serve as a direct-fit engineering replacement exclusively for the main spherical inner pivot housings found on the Hardrace #7372 Adjustable Front Lower Control Arms.

• Motorsport-Grade Spherical Construction: Utilizes a solid, highly polished metal alloy ball turning within a high-density, noise-free casing. This eliminates the dynamic deflection typical of rubber or polyurethane components.

• Restores Handling Accuracy: Instantly cures vague steering feel, front-end wandering, and dynamic toe or caster migration caused by old, worn, or loosened suspension joints.

• Sealed Anti-Dust Protection: Features a pre-installed, high-elasticity rubber dust boot that completely seals the metal spherical joint against harmful moisture, salt, fine sand, and road grime.

• Cost-Effective Refresh Strategy: Provides a highly economical alternative to replacing full adjustable control arm assemblies by targeting the exact wear-and-tear point of the system.

• Soundless and Low Friction: Built with advanced internal self-lubricating synthetic liners that provide smooth, bind-free articulation without producing clunks or mechanical squeaks under full deflection.

Technical Specifications

Applications

This individual service part is engineered exclusively to rebuild the front lower adjustable joints on first-generation ZN6 and ZC6 sports car platforms utilizing Hardrace hardware:

• Hardrace Component Fitment: Exclusively fits Hardrace Part Number 7372 (Adjustable Front Lower Control Arm + Stabilizer Link Kit)

• Toyota 86 / GT86 1st Gen (2012–2021 ZN6 Chassis equipped with Hardrace 7372 arms)

• Subaru BRZ 1st Gen (2012–2021 ZC6 Chassis equipped with Hardrace 7372 arms)

• Scion FR-S (2013–2016 ZN6 Chassis equipped with Hardrace 7372 arms)

The Mechanical Advantage: Rebuilding vs. Replacing Motorsport Geometry

Over thousands of hard cornering transitions or repetitive curb strikes on track, the internal tight clearances of a spherical ball can slowly micro-deform. This wear creates a minute gap between the ball and its race. Under a vehicle weighing nearly 2,800 lbs, even half a millimeter of internal clearance can let the entire wheel hub snap back and forth dynamically under heavy trail-braking or mid-corner load changes.

The RP-7372-PL package allows you to address this mechanical issue cleanly. Hardrace designs their high-tensile steel control arms to outlast multiple sets of bushings. By deploying a hydraulic shop press to remove the old joint and drop in a fresh RP-7372-PL insert, you return the arm to a true zero-tolerance, zero-play specification.

The integrated anti-dust boot ensures that fine track debris or road salt cannot penetrate the metal housing, protecting your new internal liners and ensuring consistent tracking through your next racing season.

Professional Lift Installation & Alignment at JDMaster

Professional Fitting Note: Restorations can be handled easily by booking a service slot at our fully equipped JDMaster.net workshop, where our technicians handle complete arm rebuilds, track-day tuning calibrations, and professional suspension installations.

Warranty

The warranty on Hardrace products depends on the type of product, with a minimum warranty period of 2 years. This warranty does not cover damage caused by a car crash, improper use, negligence or normal wear and tear.