DETROIT – General Motors has agreed to recall certain model-year 2019-2023 Chevrolet Silverado Medium Duty 4500HD/5500HD/6500HD trucks which might have a brake-fluid leak which could lead to a vehicle fire. Owners have also been advised to park their vehicles until they have been rectified.
The 40,428 trucks within the recall population, according to National Highway Traffic Safety Administration Part 573 Safey Recall Report 23V-266, “These vehicles may have a brake pressure sensor assembly that allows brake fluid to leak beyond the diaphragm seal into the pressure switch. The brake fluid may seep into the sensor’s electrical components and short the brake pressure switch and the associated fuse.”
According to the NHTSA report, such a short and condition can generate excessive heat which could result in a fire, even when the vehicle is off and unattended.
General Motors is not aware of any injuries caused by this condition.
The cause has been traced to an issue during assembly when a zinc nickel plating and sealant used to inhibit corrosion within the pressure sensor assembly may cause delamination of the sealant which results in small fragments of sealer underneath the diaphragm which allows brake fluid to slowly seep past the seal.
The remedy is replacement of the master-cylinder pressure sensor and, following inspection to determine the necessity, replacement of the associated wiring harness.
Chevrolet dealers were scheduled to be notified earlier this month as to the recall; owners are scheduled to be notified by May 29th.