This was on Zetecinside.com

The mechanics of the hydraulic system

Operating through a standard XR2 brake pedal mechanism, the right hand drive Fiesta is immediately at a disadvantage to the LHD models. The Ford Fiesta has the brake servo mechanism fitted on the left hand side of the car, and therefore on the RHD car, the force applied to the brake pedal must be transferred across the car's bulkhead, in to the master cylinders. A 3/4" diameter steel tube (transfer bar) connects the brake pedal linkage to the servo, as can be seen by the photo. The disadvantage for the RHD car comes in the form of flexing of the bulkhead when the brakes are pressed. I've reinforced (braced) the bulkhead on my Fiesta, to prevent the bulkhead from moving too much. Its a favourite for scrutineers though. They'll always make a comment regarding the flexing of the bulkhead, despite whatever steps you've taken to strengthen things.