WASHINGTON Federal safety officials are investigating 1.3 million full-sized General Motors pickups and SUVs to determine whether they have a brake defect.
If the review discloses a defect, GM must recall the trucks.
The National Highway Traffic Safety Administration says GM built the vehicles it is investigating for the 1999-2002 model years. The trucks are in states with severe winter weather.
If a recall is necessary in the United States, NHTSA says, potentially affected models include the Chevrolet Silverado, Tahoe, Suburban and Avalanche; GMC Sierra and Yukon; and Cadillac Escalade.
NHTSA is investigating whether corrosion develops under antilock brakes wheel speed sensors. That condition could increase stopping distances at low speed.
NHTSA says it has received 120 complaints about the problem. They include 22 reported crashes with four claimed injuries.
GM told NHTSA in November 2004 it was recalling 150,000 full-sized pickups and SUVs in eastern Canada because of corrosion in antilock brakes. GM did not plan a U.S. recall because it said the incident rate was much lower in the United States. But NHTSA says GM promised to monitor the situation.