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A parked McLaren 720S with its rear wing raised makes an arresting photograph, but the picture reveals little about how the system behaves on the road. The Airbrake responds to several operating conditions, and its position is only one part of the story. For US buyers comparing used coupes, understanding the manufacturer’s explanation helps turn an eye-catching feature into a meaningful inspection topic.
The wing belongs to a larger package
McLaren’s 720S model archive identifies active rear aerodynamics alongside its carbon-fiber MonoCage II structure and Proactive Chassis Control II suspension. The drivetrain combines a 4.0-liter twin-turbo V8 with a seven-speed transmission. Factory output is 720 PS, or 710 bhp, with 568 lb-ft of torque.
That context matters when comparing modified cars. A different wing profile, altered ride height or replacement body component deserves an explanation beyond its appearance. Ask which changes are factory options and which were fitted later. Request the original parts where available and have a qualified specialist assess whether the current configuration is appropriate for the vehicle.
It can move without a brake application
The McLaren factory owner’s handbook, in its Airbrake section, explains that deployment depends on the car’s requirements. Hard braking is one trigger, but measured vertical or longitudinal forces can also prompt movement. The handbook additionally notes that deployment may assist engine-compartment cooling.
Consequently, a video showing the wing move does not by itself prove that the driver was braking hard, nor does a wing remaining raised establish a defect. The useful question is whether the observed behavior matches the operating conditions and the handbook for that particular car. The linked document is a European-market factory reference; the supplied US handbook and a retailer’s guidance should govern operation of a US example.
A demonstration needs the right conditions
The same handbook says the Airbrake uses hydraulic pressure and operates with the engine running. Low transmission-oil temperature can temporarily deactivate it, with a message shown to the driver. It also describes a self-test following an ignition cycle, and warns that a deployed wing can briefly obstruct the interior-mirror view.
These details make a supervised demonstration more useful than repeatedly pressing buttons on a cold car. Ask the retailer to explain normal behavior, perform any appropriate stationary check and show how messages appear. Keep people and objects clear of the moving assembly. There is no need to reproduce high-speed aerodynamic behavior during a public-road purchase inspection.
Inspect the system rather than one photograph
Have the specialist examine mounting areas, visible damage and evidence of previous repairs. Request diagnostic findings and invoices for any work involving the mechanism or related controls. If the advertisement says the car has received an update, ask exactly which component or software was addressed and why. A cleared dashboard message alone does not explain the underlying history.
During a normal road test, concentrate on visibility, brake feel and the car’s overall composure at lawful speeds. Make notes about any messages or unexpected behavior for the technician to investigate. The 720S’s moving rear aero is compelling because it performs several jobs; buying well means understanding those jobs and establishing that the individual car’s system is operating as intended.
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