909 Motorsport M5 ABS Kit
Nissan R Chassis R32-R33-R34

Bosch Motorsport M5 ABS Integration Kit for Nissan Skyline GT-R (R32 / R33 / R34)

This is a highly integrated Bosch Motorsport M5 ABS system designed to replace the factory ABS in the R32, R33 and R34 Nissan Skyline GT-R.

At the heart of this package is the Bosch Motorsport M5 ABS, a professional-level motorsport unit used in racing worldwide. The M5 system provides ultra-fast processing, highly accurate wheel slip control, and configurable ABS strategies for track use. Eleven selectable calibrations on a 12-position map switch allow the ABS behaviour to be tuned for tyres, surface conditions, and driving style.

The R-chassis GT-R left the factory with ABS engineered for road tyres and early-1990s expectations. Thirty years on, these cars carry modern rubber, modern brake packages and far more power, and the braking electronics are the one system that never kept up. This is the platform 909 has developed most deeply, and the kit reflects it: multiple proven hydraulic unit mounting options per chassis, and a wheel speed sensing solution that works from a stock driveline through to a full aftermarket hub package.

What’s Included

• Bosch Motorsport M5 ABS control unit
• Wheel speed sensor kit, front and rear
• Outboard wheel speed sensor and tone ring relocation kit for R200 axles, suits either the stock cast aluminium hubs and wheel bearings, or aftermarket hubs (tested with ACOSTAL) running R35 wheel bearings
• Hydraulic unit mounting solution for your chassis and chosen location (see the fitment guide below)
• Yaw rate sensor mounting, integrated with the factory mount or standalone, depending on chassis
• Mounting hardware for wheel speed sensor cables to the hubs, and for sensor connectors to the body
• In-car bias valve mount
• ABS map switch

Brake lines from the master cylinder to the hydraulic unit are made to suit the vehicle at install: 909 specifications call for Goodridge or Speedflow hardware.

Fitment guide by chassis

Not every mounting solution has been developed for every chassis. This is what exists today. If the configuration you want isn’t listed, talk to us before ordering.

R34 owners: the sensing package is fully developed for your car, and hydraulic unit mounting can be developed to order; we need a chassis available to design from. If you’re planning an R34 build, get in touch early and we’ll work through it with you.

Choosing your mounting: select the hydraulic unit mounting location above. The RHS engine bay option requires the harness to be re-routed for that side, which we do here before the kit ships; that work is included in the price of that option. If you’re not sure which location suits your build, get in touch before ordering and we’ll work through it with you.

Note: this kit covers the GT-R. A separate kit for the R34 GTT is in development, contact us to register interest.

Key Benefits

• Multiple proven hydraulic unit mounting configurations across the three chassis, rather than one compromise position
• Wheel speed sensing solved from a stock driveline through to aftermarket hubs with R35 bearings on R200 axles
• Outboard sensor and tone ring relocation puts reliable, repeatable signal where the factory never had to
• Yaw rate sensor mounting designed for the chassis, not improvised at install
• Eleven selectable ABS calibrations for slicks, semi-slicks and wet circuit work
• Developed, raced and supported in-house, and shipped worldwide
• Proven Bosch Motorsport reliability

Why the wheel speed sensing moves outboard

ABS is only ever as good as its picture of what each wheel is doing. The control loop works by detecting the very start of a wheel locking, releasing pressure, and reapplying it, many times a second. All of that depends on the wheel speed signal being an honest, immediate account of the wheel itself.

Measuring inboard, at the driveshaft end, puts the whole driveline between the sensor and the tyre:

• Compliance. An axle shaft winds up under braking torque and unwinds as it releases. The inboard end and the wheel are not doing quite the same thing at quite the same moment.
• Backlash. Splines, CV joints and the differential all carry lash. Under ABS pressure cycling the driveline oscillates back and forth through it, and the sensor reads that motion as though it were the wheel.
• Sensor gap stability. An inboard sensor reads off a driveshaft that moves. Yoke deflection under load, wheelspin and changing conditions all vary the gap between sensor and ring, and a wandering gap gives a signal the ABS cannot reconcile against the other three wheels. The system does the responsible thing: it flags a sensor fault, lights the warning lamp and takes itself offline. A sequential gearbox sharpens all of this: dog engagement lands as a shock through the driveline dozens of times a lap, including on downshifts in the braking zone, which is why inboard sensing often works until the season a sequential goes in.

The result isn’t just a noisier signal; it’s a mistimed one, and at worst no ABS at all. The system releases a moment late and reapplies against a wheel that isn’t where it thinks it is, and the phasing that makes ABS work quietly comes apart.

Relocating the tone ring and sensor outboard puts the measurement at the wheel, past the compliance and past the lash, with a gap that stays where it was set.

None of this is a criticism of Nissan. The factory system sensed the rear inboard because it could: a three-channel ABS that treated the rear axle as one, reading its ring with variable-reluctance sensors whose signal grew with speed and rode out the movement. The M5 controls each rear wheel individually through active sensors with a defined gap window, so this kit isn’t second-guessing the factory, it’s updating a 1990s measuring point to the standard the new system is designed around.

The parking brake stays

Our outboard sensing package is designed around the factory parking brake rather than in place of it. That keeps the car legal for scrutineering where a functioning handbrake is required, keeps it usable on a trailer or in the paddock, and for tarmac rally, keeps the handbrake doing its job.

Developed in-house, run in competition, shipped worldwide

This kit was developed in our own workshop on a GT-R, and competitors at World Time Attack run 909 GT-R kits, in part or in full. It is also the kit we export: Supertec Racing, the UK Skyline specialist, fitted our R32 GT-R package to their own car and now offer the same system to their customers, a kit shipped ten time zones away and installed by a workshop that had never seen ours.

That is the practical point for anyone outside Newcastle. These kits are complete and documented, and we support both routes: a full install and commissioning in our workshop, or supply of the kit with our guidance behind a competent race-car builder anywhere in the world.

Technical Specifications: Bosch Motorsport M5 ABS

• Control Strategy: High-speed multi-channel wheel slip control
• Maps: Eleven selectable calibrations on a 12-position map switch
• Inputs: 4x wheel speed sensors
• Outputs: Hydraulic modulation via Bosch Motorsport valve block

Bosch Motorsport M5 vs Factory ABS

FAQs

Q: Which cars does this kit suit?
A: The R32, R33 and R34 Nissan Skyline GT-R. Mounting hardware developed for each chassis is set out in the fitment guide above. A separate kit for the R34 GTT is in development.

Q: Do I have to change my hubs or axles?
A: No. The outboard wheel speed sensor and tone ring relocation kit is designed for R200 axles and suits either the stock cast aluminium hubs and wheel bearings, or aftermarket hubs (tested with ACOSTAL) running R35 wheel bearings. Aftermarket axles are not currently supported.

Q: I have an R34 GT-R. Can I still run this?
A: Yes. The wheel speed sensing package is fully developed for the R34, and hydraulic unit and yaw sensor mounting can be developed to order; we need access to a chassis to design from. Contact us early in your build.

Q: Is the Bosch Motorsport M5 ABS included in this kit, or is it separate?
A: The kit includes the Bosch Motorsport M5 ABS unit together with the vehicle-specific integration hardware for your chassis.

Q: Do I need special tools or skills to install the kit?
A: Some expertise is required, and brake lines from the master cylinder to the hydraulic unit are made to suit at install. Professional installation is recommended. We can install and commission the system in our Newcastle workshop, or supply the kit with our guidance behind your own builder. We cover the whole job, brackets to commissioning, in what a Bosch Motorsport ABS M5 install actually involves.

Q: Can you ship this kit overseas?
A: Yes. These are 909 vehicle-specific kits and we ship them worldwide; this package has already been fitted by a UK Skyline specialist to their own car. Contact us for freight to your country.

Q: Is the system validated for road use?
A: No, Bosch Motorsport ABS is for track usage only.

Q: Can I adjust the ABS behaviour?
A: Yes. The kit includes a driver-selectable map switch with eleven selectable calibrations, allowing ABS response to be tuned for dry, wet or low-grip conditions.

Q: Will this kit suit a LHD car?
A: Allowances have been made in the engineering and design process with respect to LHD, but we have not had access to a LHD vehicle to perform testing. For the right pilot customer we would be willing to work together on testing, please get in touch via the contact page.

Q: What's the difference between the Clubsport, Kit 1 and Kit 2 core options?
A: Every option includes the same M5 system and the same 909 platform hardware. The Clubsport core uses Bosch's universal harness, the right choice for most club and time-attack builds. Kit 1 moves to a vehicle-specific loom and supports the M5's advanced control functions for cars with real aero or braking beyond about −2 g, and Kit 2 adds Autosport-specification connectors at the wheel-speed sensor leads for endurance-style service schedules. Our kit comparison guide covers the choice in detail.