1GN-IS300 LC500 REAR BBK BRACKETS
APES Motorsports Rear Big Brake Upgrade
Lexus IS300 | APES Rear Rotor Compatible
The APES Motorsports Rear Big Brake Upgrade is designed to bring balance, confidence, and durability to Lexus IS300 builds running upgraded front brake systems. This kit allows you to utilize the APES (Rear Rotor design) for the first generation IS300, delivering improved rear braking performance that complements modern 4‑ and 6‑piston front BBK setups.
Engineered for the demands of grassroots motorsports through time attack competition, these brackets are built to take abuse without compromise. Whether you’re pushing hard on track or refining a performance‑focused street build, this rear upgrade helps restore proper brake bias and consistent stopping power.
Key Features
APES Rear Rotor Compatibility – Designed specifically to run the APES rear rotor for the Lexus 1999-2005 IS300/Altezza
Race‑Bred Bracket Design – Engineered to withstand high heat, aggressive driving, and repeated abuse. manufacture from high grade T6061 aluminum and 7075 upon request.
Front BBK Complement – Ideal for vehicles upgraded to 4 or 6‑piston front big brake system.
Improved Brake Balance – Enhances rear braking performance to match increased front capacity.
Motorsports‑Driven Development – Validated through grassroots and time attack‑style use cases
Purpose‑Built Performance
Large front brake upgrades often overwhelm factory rear systems. This APES rear big brake solution is designed to close that gap, offering a more composed and predictable braking experience when it matters most. The result is improved confidence under hard braking and better overall chassis stability when paired with a bias adjustable valve. The standard OEM rear brake system is not made for motorsports. its design is for a 200hp commuter car. when under extreme breaking the factory rear rotors cannot dissipate the heat. this cause extreme warping at the rotor. a failure event can destabilize the vehicle and even cause catastrophic failures to the factory equipment.
Intended Use
This kit is intended for off‑road and motorsports applications and is best installed by a qualified professional to ensure proper fitment and performance.
Elevate your braking system with a rear solution designed to perform as hard as the rest of your build. APES Motorsports — Engineered to Perform.
Vehicle (REAR) Caliper source list
Year Make Model
Trim & Engine
Important vehicle option details
2018-2024 Lexus LC500
6 Cyl 3.5L, 8 Cyl 5.0L
2URGSE, 8GRFXS; GWZ100L-ACVBBA, URZ100L-ACUBHA, URZ100L-AKUBHA
2018-2024 Lexus LC500h
6 Cyl 3.5L, 8 Cyl 5.0L
2URGSE, 8GRFXS; GWZ100L-ACVBBA, URZ100L-ACUBHA, URZ100L-AKUBHA
2018-2024 Lexus LS500
6 Cyl 3.5L
8GRFXS, V35AFTS; GVF50L-AEVGHA, GVF55L-AEVGHA, VXFA50L-AEUGTA, VXFA55L-AEUGTA
2018-2024 Lexus LS500h
6 Cyl 3.5L
8GRFXS, V35AFTS; GVF50L-AEVGHA,

