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2021 Ford F-150 Recalled Over Electronic Brake Booster That May Leak Into ECU

Criticized for surface rust issues, the all-new Ford F-150 has been recalled no fewer than three times so far. After inadequate windshield bonding, disconnecting two-piece driveshaft, and potentially damaged steering gear, the 2021 model year is recalled over a fourth problem in the guise of an issue that concerns the electronic brake booster.
2021 Ford F-150 24 photos
Photo: Ford
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On May 20th, the Blue Oval received multiple reports of brake fluid leaking into the pickup truck’s engine control unit. The Critical Concern Review Group contacted the supplier, namely ZF Active Safety and Electronics, only to find an incomplete pressure sensor clinch that creates a leak path for the fluid to migrate into the ECU.

Following the review of supplier and production records, the Ford Motor Company has identified 169 brake boosters potentially assembled outside of the original spec. Further analysis determined that 51 assemblies “were inadvertently shipped to the Dearborn Truck Plant and assembled into vehicles,” which is a huge mistake for a volume-oriented automaker such as FoMoCo. This oversight says a lot about quality control and assurance.

Subsequently shipped to authorized retailers in the United States, those 51 trucks need remedy components. The part number for the all-new brake booster is ML34-2D335-AR according to documents filed with the National Highway Traffic Safety Administration, and known owners of those half-ton workhorses will be informed of the callback from July 26th to July 30th.

Ford highlights there will be no charge for this repair job and no reimbursement either because the original warranty program covers the faulty component. As of June 25th, the Blue Oval is aware of 12 warranty claims and no accidents or injuries associated with this problem in the U.S.

Alternately known as a vacuum booster or brake servo, the inconspicuous brake booster is designed to assist the braking system by amplifying the pressure of the brake pedal’s lever on the master cylinder. In other words, you would need a very strong right leg if brake boosters had not been invented.
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 Download: 2021 Ford F-150 brake booster recall (PDF)

About the author: Mircea Panait
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After a 1:43 scale model of a Ferrari 250 GTO sparked Mircea's interest for cars when he was a kid, an early internship at Top Gear sealed his career path. He's most interested in muscle cars and American trucks, but he takes a passing interest in quirky kei cars as well.
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