Brake Spring

NIXIM Uprated dual stage Brake spring with threshold buffer for Logitech G25 G27 G29 and G920 pedals sets

The NIXIM brake mod gives the Logitech brake pedal the same feel as that of a brake pedal in a real race car and is just as second nature to use as it should be. Slowing the car is about intuitive foot pressure, no longer are you having to make distracting conscious thought about how far you are pressing the brake pedal.
When you start to press the brake it is light and easy, but as you press the pedal further through its stroke it returns a progressive resistance so as in real life braking you always have a subconscious reference as to how hard the brakes are being applied.
As you begin to press the brake, initially the tighter spring coils close which is great for when you want to just “feather” the brake and shave a little speed, further depression means you will compress the looser coils to give the pedal the mid-range feel where the majority of braking is done.
As you approach maximum braking where you are likely to lock the cars wheels, the pedal begins to really tighten. This is where you also compress the threshold buffer inside the brake spring. The buffer gives the pedal the progressive tightening that you feel in a real brake pedal – similar to compressing hydraulic fluid within a brake system, an effect that cannot be achieved with just a spring replacement alone.


As you can see from the graph, the NIXIM brake mod gives a perfect smooth progressive brake – as good if not better even than a load cell and certainly much better than any other spring based Logitech brake pedal.
With the NIXIM V2 brake mod we guarantee substantially faster lap times over the stock brake set up.
Whilst simply replacing the stock spring with NIXIM brake mod will vastly improve the feel of your brake pedal, where your driving game or simulation allows we recommend a software adjustment of 35% dead zone and a sensitivity setting around 30%, this will give you baseline starting setup. These settings can be adjusted to your own preference as required. Check fine tuning at the bottom of this page.


With the introduction of the G29 and G920 pedal sets, Logitech utilised NIXIM’s rubber buffer innovation, at the same time small plastic mouldings were fitted to the inside of the spring chamber in order to protect the Logitech buffer (which is the same size as NIXIM’s buffer), it is these white plastic caps that cause the sudden change in direction of the G29 profile as seen on our graph – you feel it plainly as you press the stock brake pedal. Notice also the profile line goes almost vertically off the graph without getting anywhere near full pedal depression (actually restricting the last 9mm of pedal throw) (These white plastic caps must be removed when fitting the NIXIM brake mod).
NIXIM also experimented with the same idea when developing our brake mod – and we had the same results. So we decided to further modify the buffer to give a smoother more progressive brake – as you can see from the graph comparison. Logitech also retained the original single stage spring of the G25/G27 for the G29 and G920 so the new Logitech setup is almost identical to NIXIM’s first G25/G27 pedal mod without the two stage spring of the second more popular brake mod.

Fine Tuning of the NIXIM Brake mod
The deadzone can be calibrated perfectly to fine tune the NIXIM brake mod with your own pedal set –
First park your car at the top of a downhill section of track, park in neutral with your car facing downhill and with your foot on the brake to prevent the car from rolling. Then release the brake and allow the car to roll down hill – still in neutral. Then slowly apply the footbrake until you feel the first slight step in the pedal return spring, you should feel this when you have moved the pedal about 10mm from its rest position.

This is the point where the brake pads have made contact with the brake discs and at this point the car should come to a slow stop. If you feel the step and your car does not stop then reduce the deadzone slightly. If the car stops before you feel the step then increase the deadzone slightly. When the car stops at the correct pedal pressure you have set the deadzone for your particular pedal set brake.
You will now develop an intuitive feel for the brake pedal, where you will instinctively know exactly how to feather and fine control your braking. Lowering the pedal sensitivity ingame will mean a stiffer brake pedal, and raising the sensitivity will therefore make it softer and less foot pressure is required to slow the car.
Setting a harder pedal will give the driver a wider range of feel for braking, generally the harder the better with an even wider range of feel.

It is advisable to check the deadzone after a few hundred laps as the brake buffer does bed in after a while.