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Yellow Speed Racing Rear 6 Piston Ultra Big Brake Kit - Lexus IS300 2001-2005 (JCE10)

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

The Yellow Speed Racing Rear 6 Piston Ultra Big Brake Kit is engineered for drivers who demand consistent, fade-free braking for aggressive street driving and track use. Designed to outperform factory rear brakes, this kit delivers increased stopping power, improved heat management, and striking visual appeal—all in a direct bolt-on package. Ideal for high-horsepower builds and motorsports applications, the Ultra Series ensures confidence under extreme braking conditions.

High-Performance Rear Braking System: Factory rear brakes are designed primarily for daily driving. This upgraded system significantly improves braking performance, helping prevent brake fade caused by extreme temperatures during track, drift, time attack, or spirited driving.

6-Piston Forged Aluminum Calipers: Lightweight forged billet aluminum split-design calipers feature anti-rust coating and vented aluminum pistons to improve heat resistance, braking consistency, and pedal feel.

Multiple Caliper Options:
YSCPR6a: Ø28mm, Ø25mm, Ø22mm pistons with 233mm x 67mm pad area
YSCPR6b: Ø32mm, Ø28mm, Ø25mm pistons with 262mm x 76mm pad area
(Caliper type varies by application)

Large-Diameter Two-Piece Rotors: Two-piece rotors feature lightweight aluminum center bells and performance steel friction rings for improved cooling and reduced unsprung weight. Rear rotors include integrated inner drums where applicable.

Rotor Style Options: Available in slotted, drilled, or drilled & slotted configurations with straight or curved slots for optimized heat dissipation and pad bite.

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)

Improved Serviceability & Weight Reduction: Reduced unsprung weight improves handling, while larger pads and rotors extend service intervals and simplify maintenance compared to factory brakes.

Direct Bolt-On Installation: Designed as a direct bolt-on upgrade using factory mounting points. Installation typically requires common hand tools and included CNC-machined steel caliper brackets.

Customizable Appearance: Calipers can be customized with different colors, finishes, and optional etching to match your build’s style.

Rear Brake Kit Notes:

  • Part numbers with (X) do not retain OEM handbrake functionality

  • Part numbers with (V) retain OEM handbrake functionality

  • Part numbers with (X)(★) can retain OEM handbrake functionality when paired with the YSR Handbrake Adapter System (sold separately)

What’s Included:

  • Forged billet aluminum 6-piston rear calipers

  • Two-piece rear rotors (style and size selected)

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

  • 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 performance.

Vehicle Fitment:

  • Lexus IS300 (2001–2005) – JCE10 chassis

  • 5x114.3 lug pattern

  • Rear brake application only

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

Disclaimer: Product images shown are for marketing purposes only. Actual components may vary in appearance based on configuration options selected. Please contact us for confirmation of specific kit details prior to ordering.

Why Choose Yellow Speed Racing Ultra Big Brake Kits?: Designed for serious enthusiasts, YSR Ultra Series brake kits deliver powerful, consistent braking, reduced fade, and track-proven reliability—making them the ideal upgrade for high-performance Lexus IS300 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.