Toyota Motor Corp. will fix the gas pedal on 4.26 million vehicles it is recalling to prevent loose mats from trapping it and causing unintended acceleration, the company and U.S. safety regulators said Wednesday.

Toyota also will install a brake override system on some of the models as "an extra measure of confidence," the company said.

The brake override system, which stops the car from acceleration if there is any pressure on the brake, will be applied eventually across the entire model range, Toyota officials said.

Toyota's recall notice, filed Wednesday, said the number of affected vehicles is 4.26 million produced as of Nov. 15, a figure that could increase as Toyota will have to fix vehicles it sells through at least Dec. 31.

Toyota will begin notifying customers in late December, but will not complete the notification until June.

The Japanese automaker has been under enormous pressure to respond to hundreds of reports of unintended acceleration of Toyota and Lexus vehicles in the United States in recent years.