Locking Hubs and Axles
Brake & Front End
SEPTEMBER 28, 2023
According to Ford TSB 20-2028, apply 508 mm-Hg (20 in-Hg) of vacuum. There are updates to the software for the TCCM that changes how the solenoid controls the IWEs. On 2013 and newer trucks, the solenoid was moved next to the brake booster on the driver’s side. Connect a vacuum pump to the hose going to the IWE units. mm-Hg (0.5
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