DETROIT — General Motors said it will recall 210,628 vehicles in the U.S. and 19,385 vehicles in Canada because of an issue with the brake system that could increase the risk of a crash.
Gas from a defective piston can be released into the vehicle’s brake system and create a “soft or spongy feel” when the driver presses the brake, affecting rear-brake performance, according to a safety defect report filed by GM.
“The manufacturer of the brake pistons failed to properly chrome and temper the brake pistons during the manufacturing process,” the report says. “In this condition, hydrogen gas can remain trapped in the piston body.”
The affected vehicles are the Buick LaCrosse, Cadillac XTS, GMC Terrain and Chevrolet Bolt EV, Cruze, Equinox, Impala, Malibu and Volt, from the 2018 and 2019 model years.
According to the report, ZF Group was investigating similar reports on its brake calipers from other automakers such as Audi, Volkswagen and BMW but did not notify GM until June 14.
In Canada, GM’s recall notice uses some of the same language as one issued for Fiat Chrysler Automobiles vehicles in mid-August. That recall also affected vehicles from the 2018 and 2019 model years in Canada, but it was unclear whether the recall was for the same issue.
In ZF’s July safety defect report, the supplier did not list GM as a purchaser of affected brake calipers, the automaker’s report says.
ZF did not immediately return a request for comment from Automotive News.
To rectify the issue, GM dealers will bleed the rear brakes as necessary to remove any gas. GM said it is not aware of any crashes caused by the issue.