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Yellow Speed Racing Rear 6 Piston Ultra Big Brake Kit - Lexus GS300 1993-1997 (JZS147)

Original price $2,200.00 - Original price $3,200.00
Original price
$2,200.00
$2,200.00 - $3,200.00
Current price $2,200.00

Yellow Speed Racing Rear 6 Piston Ultra Big Brake Kit – Lexus GS300 (JZS147)

The Yellow Speed Racing Rear 6 Piston Ultra Big Brake Kit is designed to complement front big brake upgrades while delivering improved rear braking balance, heat management, and track-ready performance. Built for both road and motorsport use, this Ultra Series rear kit enhances braking consistency, aesthetics, and serviceability over the factory rear brake system.

High-Performance Rear Brake Upgrade: Factory rear brakes are designed primarily for daily driving and can struggle to maintain consistency during aggressive driving or track use. This rear Ultra Series kit improves braking balance and reduces fade under extreme heat.

Forged 6-Piston Rear Calipers: Lightweight forged billet aluminum split-design calipers feature anti-rust coating and vented aluminum pistons to improve heat resistance and braking stability.

Rear Handbrake Compatibility Options:
(X): Does not retain OEM handbrake functionality
(V): Retains OEM handbrake functionality
(X)(★): Retains OEM handbrake functionality when used with the YSR Handbrake Adapter System (sold separately)

Caliper Options Available:
YSCPR6a: Ø28mm / Ø25mm / Ø22mm pistons – 233mm x 67mm pad area
YSCPR6b: Ø32mm / Ø28mm / Ø25mm pistons – 262mm x 76mm pad area
(Caliper configuration varies by application)

Two-Piece Performance Rear Rotors: Lightweight two-piece rotors feature aluminum center bells with integrated inner drum steel bells to support OEM-style handbrake systems where applicable.

Rotor Style Options: Available in slotted, drilled, or drilled & slotted designs with straight or curved slots for improved heat dissipation.

Rear Rotor Sizes Available:

  • 330mm x 28mm (12.99" x 1.09")

  • 356mm x 28mm (14.02" x 1.09")

  • 356mm x 32mm (14.02" x 1.26")

  • 380mm x 32mm (14.96" x 1.26")
    (Rotor size varies by application)

Direct Bolt-On Installation: Designed as a true bolt-on rear brake upgrade using factory mounting points. Includes CNC-machined steel caliper brackets and all required hardware.

Improved Service Life & Maintenance: Larger pads and rotors offer improved thermal capacity, longer service intervals, and simplified brake maintenance.

What’s Included:

  • Forged billet aluminum 6-piston rear calipers

  • Two-piece rear rotors with integrated inner drum (style & size selected)

  • High-performance brake pads (OEM+, Sport, or Competition)

  • Stainless steel braided Teflon brake lines

  • CNC-machined steel caliper mounting brackets

  • Complete installation hardware

  • Owner’s manual

Brake Fluid Recommendation:
YSR recommends Motul 5.1 or RBF600 brake fluid for optimal braking performance.

Vehicle Fitment:

  • Lexus GS300 (1993–1997) – JZS147

  • 5x114.3 bolt pattern

  • Rear brake application only

Manufacturing & Shipping:
YSR Big Brake Kits are made to order. Please allow approximately 15–25 business days for manufacturing and shipping.

Disclaimer:
Photos shown are for marketing purposes only. Actual components may vary based on configuration selected. Wheel clearance varies by rotor and caliper choice—wheel templates are available for test fitting prior to purchase. Please contact us to confirm fitment before ordering.

Why Choose Yellow Speed Racing Ultra Big Brake Kits?:
With powerful multi-piston calipers, large two-piece rotors, and motorsport-proven engineering, YSR Ultra Series rear brake kits deliver the stopping balance, durability, and performance required for serious GS300 builds.

About Us

We are passionate Lexus and Toyota enthusiasts dedicated to providing the highest quality aftermarket parts to enhance your ride. Our goal is to help you find the perfect performance upgrade, whether you're building your dream car or just adding that next improvement. We take pride in offering products that we trust for our own vehicles.

Shipping

Shipping times vary based on item availability and specific lead times. You can expect an email with an estimated shipping date within 1-3 days of placing your order. Many in-stock parts ship within 2-5 business days, while certain built-to-order items may take up to 7-10 business days. For back-ordered items, availability may vary, but we will email you with any ETA changes.

Once your items are ready to ship, we will send tracking information via email so you can easily follow your package from our warehouse to your door. Please note, some parts may be shipped separately and could arrive at different times. Shipping costs apply to the lower 48 states, unless stated otherwise, and international orders may be subject to additional customs or duties fees.

What to Expect Upon Delivery

Upon receiving your order, please inspect the items immediately for any damage or missing parts. Verify all items against the packing slip or instructions before starting installation. We cannot be held responsible for costs incurred from delays due to missing items.

If any items are damaged or missing, please get in touch with us within 14 days of receipt so we can assist with a replacement. Claims made after this period will not be honored.

Cancellation Policy

If you need to cancel or modify your order, please contact us as soon as possible. We strive to ship your order quickly, and once processing begins, cancellations may be subject to a restocking fee. Orders canceled within 24 hours of purchase may not incur a fee, but after that time, restocking fees (typically 20%) will apply depending on the items and the stage of fulfillment.

Return Policy

Customer satisfaction is our priority, and we are happy to assist with returns. However, due to the complexity of sourcing and delivering our products, returns are subject to a restocking fee (usually 20%) based on the item and manufacturer.

Before returning any items, please get in touch with us to receive a return authorization. All return requests must be made within 30 days of receiving your merchandise. Once approved, items must be returned within 14 days in their original condition. Improper packaging of returned items may result in customer responsibility for damages.

Customers are responsible for return shipping costs, unless the item is defective or we shipped the wrong item. A trackable shipping method is strongly recommended.

Warranty

We honor all manufacturer warranties and are here to support you in getting the quality products you deserve. However, please note that warranty claims are available to the original purchaser only. In certain situations, manufacturers may handle warranty claims directly, and we are unable to cover costs not specified in the manufacturer's warranty (e.g., shipping, labor). If you have any questions, feel free to reach out to us.

Emissions Notes

All parts and services offered by LunaticsCo are for competition vehicles only. Use on state and federal highways may be a violation of the EPA Clean Air Act. The Clean Air Act can be found at http://www.epa.gov/air/caa/. This document details what are considered violations of the CAA and the corresponding penalties for failure to comply. It should be read in full before purchasing or installing this competition-use-only product. Ensuring that all emissions, noise/sound, and speed/use-related laws are followed is the responsibility of the buyer(s). Installation and use of this product indicate that this disclaimer has been read, acknowledged, and fully understood by both the buyer(s) and installer(s). The buyer(s) assume all associated risks of purchase.

Federal and several state laws prohibit the removal, modification, or rendering inoperative of any part that affects emissions or safety on motor vehicles used on public streets or highways. LunaticsCo assumes no liability for any violations arising out of any federal, state, or provincial emissions or safety requirements on motor vehicles resulting from the customer’s modifications and/or use of LunaticsCo products. It is the responsibility of the customer to determine if their modified vehicle complies with applicable laws.