Under pressure from the federal government, General Motors recalls more than 3.4 million large pickup trucks and SUVs in the United States to solve a braking problem.
The recall covers the Chevrolet Silverado and GMC Sierra 1
GM says that as it ages, the pump in the auxiliary brakes can release less vacuum power than necessary, increasing the stopping distance and the risk of a break.
The recall comes after the National Highway Traffic Safety Administration began investigating the issue in November last year.
Dealers will calibrate the electronic brake control module at no cost to customers. Owners should be notified from 6 September.
NHTSA, the government's road safety agency, began investigating the problem last year after receiving 111 complaints from owners with poor braking ability. At that time, the agency had nine reports of crashes that had caused two injuries.
GM states that the problems occur rarely and largely at low speeds such as driving in parking lots. Even with the problem, the brakes continue to work and exceed the requirements of the relevant federal motor vehicle safety standard, "said GM spokesman Dan Flores.
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The vacuum pump is lubricated with In some of the trucks, oil sludge or other debris can clog the screen, reduce the oil flow and cause the pump's vacuum output to fall, Flores said.
The trucks, he said, have a secondary braking assist system that works when "There are problems with the main system, but it's limited to lower speeds. Reprogramming will activate the secondary system faster.
GM does not replace pumps because pump failures are rare and already covered by an extended warranty," Flores said. the performance of the brake in any situation where the brake vacuum drops, "he said.
The recall comes ten months after NHTSA opened When asked why it took so long to make the recall, Flores said only that the company has partnered with NHTSA and provided data.
Drivers could feel a vibration in the brake pedal or a pressure change required to push the brake pedal if their trucks have the vacuum pump problem. If the problem comes to light, the owners will see a message on their dashboard saying that they should operate the brake assist system, Flores said.
Although the recall is large, the cost will not be high enough for GM to report it to the Securities and Exchange Commission as an event that will have a significant impact on earnings, Flores said. He said he did not know the cost.