Why do R35 GT-R owners add brake air guides for track use?

The R35 GT-R runs large Brembo brakes from the factory, but the stock front end does not actively direct airflow to the rotors. During repeated hard braking on circuit, temperatures build faster than passive airflow can manage, which affects brake feel and pad longevity over a session. The Top Secret front brake air guides R35 fix that by physically routing fresh air into the brake system rather than relying on incidental airflow.

Why is carbon kevlar used instead of standard carbon fiber for this part?

This part sits in the front of the car where it takes aerodynamic load as well as heat exposure from the brake system. Standard carbon fiber is stiff but more brittle under impact and structural stress. Kevlar reinforcement adds toughness and resistance to cracking or fracturing under the combined mechanical and thermal loading this position sees, which is why Top Secret specified it specifically for the front stabilizer function this guide also serves.

How much does brake cooling improve with these guides installed?

Top Secret does not publish specific temperature figures, but the principle is straightforward; the guides actively direct air that would otherwise bypass the brake assembly into the rotor and caliper area. The gain is more consistent over a session than what passive airflow provides, and the benefit increases further when these guides are used alongside Top Secret's front aero components, which work with the guide geometry to maximize the volume of air being directed to the brakes.

Do these guides work with the factory front bumper or only with Top Secret aero?

They bolt on to the R35 and function with the factory front end. The additional brake cooling benefit noted by Top Secret when used with their aero parts refers to the way their bumper and diffuser geometry increases the volume and direction of air reaching the guide inlet. The guides work standalone; the aero combination improves on that baseline.

Is installation straightforward or does it require removing the front bumper?

Fitment is bolt-on with no cutting or modification required. Depending on access to the mounting points, partial front end disassembly may be needed, but no permanent modification to the car is involved. A workshop familiar with the R35 front end can complete the installation without difficulty.

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Description

Top Secret Carbon Kevlar Front Brake Air Guides for R35 Nissan GT-R

The Top Secret front brake air guides R35 GT-R builds running the car hard on track need are a bolt-on solution to one of the platform’s persistent circuit problems: brake temperatures that climb during sustained high-load driving and do not come down fast enough between corners. The guides mount to the front end and actively channel fresh air directly into the brake system rather than letting airflow find its own path, which on a stock front end means most of it bypasses the rotors entirely. Built from carbon kevlar, a material chosen specifically for this position on the car; the front location takes structural loading as well as thermal exposure, and the kevlar reinforcement adds the strength and rigidity the part needs to hold its shape under those combined stresses. When used alongside Top Secret aero components, the guided airflow integrates with the broader front end aerodynamic package to push even more cooling air toward the brakes. Bolt-on fitment, no cutting required.

Features

Actively channels fresh air directly to the front brake system
Carbon kevlar construction
High strength and rigidity under structural and thermal load
Functions as a front stabilizer in addition to brake air guide
Bolt-on fitment, no modification required
Compatible with Top Secret aero components for enhanced brake cooling
Sold as a pair

Applications

Nissan GT-R: CBA-R35, DBA-R35, EBA-R35, 4BA-R35 | 2008-2025

Notes

Sold as a pair

Frequently Asked Questions

Why do R35 GT-R owners add brake air guides for track use? The R35 GT-R runs large Brembo brakes from the factory, but the stock front end does not actively direct airflow to the rotors. During repeated hard braking on circuit, temperatures build faster than passive airflow can manage, which affects brake feel and pad longevity over a session. The Top Secret carbon kevlar front brake air guides R35 fix that by physically routing fresh air into the brake system rather than relying on incidental airflow.
Why is carbon kevlar used instead of standard carbon fiber for this part? This part sits in the front of the car where it takes aerodynamic load as well as heat exposure from the brake system. Standard carbon fiber is stiff but more brittle under impact and structural stress. Kevlar reinforcement adds toughness and resistance to cracking or fracturing under the combined mechanical and thermal loading this position sees, which is why Top Secret specified it specifically for the front stabilizer function this guide also serves.
How much does brake cooling improve with these guides installed? Top Secret does not publish specific temperature figures, but the principle is straightforward; the guides actively direct air that would otherwise bypass the brake assembly into the rotor and caliper area. The gain is more consistent over a session than what passive airflow provides, and the benefit increases further when these guides are used alongside Top Secret’s front aero components, which work with the guide geometry to maximize the volume of air being directed to the brakes.
Do these guides work with the factory front bumper or only with Top Secret aero? They bolt on to the R35 and function with the factory front end. The additional brake cooling benefit noted by Top Secret when used with their aero parts refers to the way their bumper and diffuser geometry increases the volume and direction of air reaching the guide inlet. The guides work standalone; the aero combination improves on that baseline.
Is installation straightforward or does it require removing the front bumper? Fitment is bolt-on with no cutting or modification required. Depending on access to the mounting points, partial front end disassembly may be needed, but no permanent modification to the car is involved. A workshop familiar with the R35 front end can complete the installation without difficulty.

About Top Secret

Top Secret Co., Ltd. (株式会社トップシークレット, Kabushiki-gaisha Toppu Shīkuretto) is a renowned Japanese automobile tuner and parts manufacturer, founded by automotive engineer and driver Kazuhiko “Smokey” Nagata. The company is widely recognized for its expertise in tuning, aftermarket parts, body kits, and performance engineering. Top Secret’s product range includes aero components, exterior and interior parts, engine upgrades, exhaust systems, chassis, brakes, suspension, and powertrain enhancements. In addition to its products, Top Secret is also famous for its high-speed Wangan runs, as well as its involvement in professional drifting, circuit racing, and drag racing.

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