Why upgrade to 400mm rear rotors on the R35 GT-R?

The factory rear rotors on the R35 measure 380mm. At stock power and street driving levels that is adequate, but once grip increases through tire upgrades or pace increases through track use, the rear brakes are asked to handle more repeated high-load stops than the OEM thermal capacity comfortably manages. The Top Secret 400mm rear brake rotors GT-R add 20mm of diameter, which increases both braking torque and the thermal mass available to absorb heat before fade affects pedal feel and rear brake balance.

What does semi-floating two-piece construction do that a standard one-piece rotor does not?

A one-piece rotor expands as a single unit when it heats up, which can cause warping, judder, and pad deposits if temperatures cycle repeatedly. A semi-floating two-piece rotor allows the hat and rotor ring to move independently within controlled limits, so thermal expansion is managed rather than resisted. On a platform as heavy as the R35 doing repeated stops, that distinction matters for rotor longevity and pedal consistency through a session.

Do these rotors require new calipers or caliper brackets?

No. The special steel mounting brackets included with the kit are designed specifically to allow the 400mm rotors to work with the factory R35 rear calipers. No aftermarket calipers are required and no custom fabrication is needed. The brackets are a bolt-on solution that positions the OEM caliper correctly over the larger rotor diameter.

Is a brake bedding procedure required after fitting these rotors?

Yes. New slotted rotors and pads require a proper bedding procedure to transfer an even layer of pad material onto the rotor surface and seat the semi-floating components correctly. Skipping bedding on a new rotor set leads to uneven pad deposits, judder, and reduced initial bite. Follow the bedding procedure recommended by your brake pad manufacturer before putting the car through any high-load stops.

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Description

Top Secret Rear Slotted 2PC 400mm Brake Rotors with Special Brackets for R35 Nissan GT-R (w/o factory carbon brakes)

The Top Secret 400mm rear brake rotors GT-R builds running increased grip and pace need replace the factory 380mm rear units with a 20mm larger semi-floating, slotted two-piece motorsport-style rotor designed to add thermal capacity and maintain consistency through repeated hard stops. The R35 carries significant weight and speed into the braking zone, and once pace increases beyond what street driving demands, rear brake temperatures and balance become a limiting factor. These rotors address that directly: the larger diameter increases braking torque and gives the rear brakes more thermal mass to absorb and dissipate heat before fade sets in, while the slotted surface clears gas and debris from the pad face to maintain consistent bite through a session. The special steel mounting brackets are included and allow the rotors to bolt on while retaining the factory rear calipers, so the upgrade does not require sourcing aftermarket calipers or fabricating custom hardware. Semi-floating construction keeps the rotor stable under thermal expansion, which is the detail that separates a motorsport-style two-piece rotor from a standard aftermarket unit on a platform this heavy.

Features

Big rotor upgrade
Increased braking torque and thermal capacity
Retains the factory front calipers with special brackets
Bolt-on installation
Semi-floating, slotted motorsport-style design
Improves consistency during repeated high-speed braking
Sold as a pair (two rear brake rotors)

Specifications

Rotor Diameter: 400mm
Rotor Type: 2-piece, semi-floating, slotted
Location: Rear
Caliper Compatibility: Retains OEM front brake calipers
Included Hardware: Steel special mounting brackets (for OEM caliper bolt-on fitment)
Rotor Size Increase vs. OEM: +20mm (OEM 380mm)

Applications

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

Notes

Sold as a rear brake rotor pair
Does not fit NISMO or T-Spec models with factory carbon ceramic brakes, please refer here for NISMO and T-Spec carbon ceramic fitment
Complete the set with the front rotors available here

Frequently Asked Questions

Why upgrade to 400mm rear rotors on the R35 GT-R? The factory rear rotors on the R35 measure 380mm. At stock power and street driving levels that is adequate, but once grip increases through tire upgrades or pace increases through track use, the rear brakes are asked to handle more repeated high-load stops than the OEM thermal capacity comfortably manages. The Top Secret 400mm rear brake rotors GT-R add 20mm of diameter, which increases both braking torque and the thermal mass available to absorb heat before fade affects pedal feel and rear brake balance.
What does semi-floating two-piece construction do that a standard one-piece rotor does not? A one-piece rotor expands as a single unit when it heats up, which can cause warping, judder, and pad deposits if temperatures cycle repeatedly. A semi-floating two-piece rotor allows the hat and rotor ring to move independently within controlled limits, so thermal expansion is managed rather than resisted. On a platform as heavy as the R35 doing repeated stops, that distinction matters for rotor longevity and pedal consistency through a session.
Do these rotors require new calipers or caliper brackets? No. The special steel mounting brackets included with the kit are designed specifically to allow the 400mm rotors to work with the factory R35 rear calipers. No aftermarket calipers are required and no custom fabrication is needed. The brackets are a bolt-on solution that positions the OEM caliper correctly over the larger rotor diameter.
Is a brake bedding procedure required after fitting these rotors? Yes. New slotted rotors and pads require a proper bedding procedure to transfer an even layer of pad material onto the rotor surface and seat the semi-floating components correctly. Skipping bedding on a new rotor set leads to uneven pad deposits, judder, and reduced initial bite. Follow the bedding procedure recommended by your brake pad manufacturer before putting the car through any high-load stops.

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.

Additional Information

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Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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