A small number of 2020 Chevrolet Bolt EV owners will be returning to their dealerships to repair a problem affecting the brakes in their vehicles. General Motors has decided that this defect can affect vehicle safety.

According to the defect report, certain 2020 Chevy Bolt EVs may have improperly cast front left brake calipers. (Iron used to manufacture the caliper was not properly treated by the supplier prior to casting.) During a high pressure braking event, the caliper could fracture and brake fluid would be lost to half of the vehicle’s braking system. The problem could result in an unexpected reduction in brake performance and an increased chance of an accident.

Owners receiving notices will be asked to return to their dealerships to have the casting lot number of the front left brake caliper inspected and replace as necessary. GM’s number for this recall is N202321400 and the NHTSA campaign number is 20V-808.