This architecture, combined with rigorous assembly, guarantees driving accuracy and acoustic insulation that is of direct benefit to the smoothness of the suspension. Compared to other 407s, the front track is wider by 23 mm (EW12) and 19 mm (ES9/A - DT17). To control incipient roll, the diameter of the front anti-roll bar of the ES9/A 6-cylinder version has been increased by 0.5 mm (24.5 m) and with the V6 Diesel engine it is 25 mm.

As on all Peugeot 407s, the multi-arm rear suspension incorporates spring/inclined damper assemblies and on each side a drop-link longitudinal arm, ensuring that it operates fully in the longitudinal plane only, to eliminate ancillary stresses that generate vibrations.

Compared to that of other Peugeot 407s, the rear track of the coupe has been widened to 1.575 m (46 mm) for the EW12 and 1.567 m, i.e. by more than 45 mm, for the 6-cylinder engines.

Traditional damping has been retained on the Peugeot 407 Coupe 2.2 litre and suitable patterns have been used in accordance with the new body height and specific weight of this version.

On 6-cylinder models, the damping is variable and each damper is controlled separately. A new damping control strategy means that progression to firmer patterns occurs very rapidly to achieve more energetic control of pitch, bounce and roll movements under all driving conditions (uneven roads, high speed, obstacles, loaded vehicle, etc). By means of a push-button, it is still possible to switch to the "Sport position" for a direct changeover to the firmest damping patterns.

The electro-hydraulic power steering of the 2.2 litre model is variable and a piloted electro-pump unit controls the pressure according to the car's speed and the speed of rotation of the steering wheel.

On all Peugeot 407 versions, the steering wheel is height- and depth-adjustable over a distance of 40 mm in both planes.

On 6-cylinder versions, "continuous" variable hydraulic assistance is provided by a computer-controlled valve. This takes into account a wide range of information such as vehicle speed, engine speed, steering angle and steering wheel speed. Compared to the other device, this one provides more assistance at low speed and a wider range of power steering variations, while ensuring a good "reading" of the road.

Assisted braking on all versions is provided by large-diameter, ventilated front discs ( diameter 330 mm, thickness 30 mm). The rear discs have a diameter of 290 mm and a thickness of 12 mm.

The ESP, standard on all models, includes the following main functions:

• The anti-lock braking system (ABS) is calibrated for 17" and 18" wheels. It incorporates wheel by wheel braking with distribution between the front and rear axles, as well as a system allowing the right and left wheels to be controlled independently.

• There is also emergency brake assist (EBA) calibrated to activate depending on the speed at which the brake pedal is depressed, and above a rate of deceleration of 8 m/sec², the hazard warning lights will automatically illuminate.

• In addition to the traction control (ASR) acting on the brakes and the engine, the stability control (CDS) continuously compares the steering wheel angle, the car's rate of yaw, the speed of the wheels and the transverse acceleration of the vehicle to detect any incipient under or oversteer. As a result of these detections, the ECU orders corrections to be made to return the car to the trajectory requested by the driver, within the limits of the laws of physics.
  
  
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