NHTSA recall 77V027000
Vehicle speed control
Mercedes Benz 450SL and 1 more
The defect
On the involved vehicles, corrosion could develop in the cruise control system servo unit. Consequently, the cruise control system may not respond to attempts to release it by depressing the brake pedal, but could begin to accelerate the vehicle from the set speed (above approximately 30 mph).
The remedy
Dealer will inspect and, if necessary, install a replacement actuator unit inside the passenger compartment, free of charge.