There are moments in motorsport history where an innovation, initially viewed as a clever loophole, ends up shaping the future of automotive technology in unexpected ways. And this is exactly what happened when McLaren’s F1 team, almost by accident, played a pivotal role in pioneering concepts that would later evolve into modern torque vectoring systems. But here’s where it gets controversial: was it truly a brilliant innovation, or simply a risky shortcut that F1 teams efficiently exploited before it was shut down? Let’s explore this fascinating tale.
In the late 1990s, Formula 1 was a hotbed of ingenuity, with teams pushing the boundaries of what's permissible within the regulations. Electronics were rapidly advancing, and the rules were often ambiguous enough for clever teams to find ways to gain an edge. Among the most remarkable developments was McLaren’s infamous ‘extra pedal’ — a short-lived but revolutionary device that temporarily changed how cars could be driven through corners.
At its core, the setup consisted of a third pedal beside the traditional accelerator and brake. This pedal was connected directly to a system that allowed the driver to brake one of the rear wheels independently. Simply tapping this pedal could cause the car to rotate more sharply into a corner — effectively giving the driver extra control over the vehicle’s yaw (or how it turns). It might sound straightforward: just brake one wheel? But in practice, it amounted to a primitive form of torque vectoring, predating the more sophisticated systems we see today in road cars.
What Did This ‘Extra Pedal’ Do in Practice?
Placed in the cockpit, the third pedal enabled the driver to apply braking torque selectively to either the left or right rear wheel. Slowing one wheel relative to the other meant the car could be made to steer more willingly into a turn without upsetting the overall balance excessively. This allowed for sharper, more precise cornering, especially in slow or tight bends, by reducing understeer — where the car resists turning as much as the driver intends.
Such a system could be tuned to the track conditions, and initially, McLaren’s engineers found they could shave off significant time, with their cars lapping half a second faster. Mika Hakkinen, the reigning World Champion, exploited this advantage during races, contributing to the team’s 1998 championship victory. Interestingly, the system was not automated — it depended on the driver’s skill and judgment, as they manually pressed the pedal to influence handling in real-time. Over time, McLaren added a switch within the cockpit, allowing drivers to select which rear wheel was braked depending on the corner, further enhancing its usability.
From the perspective of an engineer, this was straightforward yet ingenious: a simple hydraulic or brake system, linked with an additional pedal, allowed for dynamic control of individual wheel braking — very much a handcrafted form of torque management.
But Why Did Formula 1 Ban It?
The system drew immediate attention. Photographers captured images revealing the odd glow of a single brake rotor in Hakkinen’s car — a clear sign it was in active use, yet not officially part of the standard braking setup. When reporters, including Darren Heath and Matt Bishop, investigated, they confirmed that McLaren was doing something quite radical. Rival teams, initially confused, quickly protested, arguing that it breached the integrity of regulation and amounted to an unfair advantage.
Although McLaren’s team believed their system was legal — they had simply integrated an additional pedal, properly plumbed into the brakes — the FIA (the sport’s governing body) viewed it as a form of four-wheel steering, which was prohibited at the time. The instant the innovation was flagged, F1 moved swiftly to ban the system, effectively ending its brief but impactful stint.
Surprisingly, McLaren executives claimed that developing the system cost about £50 — a surprisingly low investment for the performance gains it offered. This financial aspect made others in the paddock argue that creating a similar system would be prohibitively expensive or not worth the trouble, which may have helped limit its proliferation.
The Legacy of a Short-Lived Innovation
Though the ‘extra pedal’ vanished from F1 after the ban, its influence persisted far beyond the track. The core idea — controlling each wheel individually to optimize handling — couldn’t be ignored. Over following years, engineers experimented with electronic brake-based torque vectoring. Modern cars, especially high-performance hot hatches and luxury SUVs, now automatically brake inside wheels to improve agility and cornering stability without driver input.
This concept eventually matured into active differentials that distribute torque side-to-side, replacing or supplementing traditional mechanical LSDs (Limited Slip Differentials). While these systems are more sophisticated than simply pressing a pedal, the foundational principle remains the same: adjusting the forces on individual wheels to influence vehicle rotation and stability.
Why Does This Matter?
McLaren’s ‘fiddle-brake’ exemplifies how Formula 1 continues to act as a testing ground for innovative ideas. Even when regulations close the door, the seeds of these innovations often sprout into production cars or pave the way for future safety and performance features. Ironically, what was once deemed too disruptive or too clever for F1 — a system that allowed for wheel-by-wheel control — is now a common feature in regular vehicles, subtly enhancing driver safety and vehicle dynamics.
So, while the idea of an extra pedal may seem simple, its implications are profound. It prompts a critical question: Are modern driver assist technologies truly innovations, or just refined versions of old ideas that F1 inadvertently unleashed?
We’d love to hear your thoughts! Do you believe McLaren’s system was a stroke of genius or a dangerous shortcut that should never have made it onto the track? Drop your opinions in the comments below and let’s discuss the fine line between innovation and regulation in motorsport.
