2004 Ford E350 SuperDuty - Cruise Control Inop TIP

[Jeff @ Able Auto]

Just a heads up. I replaced a cruise control servo after all the tests lead to a failed servo. Roadtest cruise was still inop. Called Ford to inquire on the chances of the servo being bad outta the box. Parts guy recommended I replace the brake pressure switch on the master. Did so and roadtested OK. The switch was clean and dry. The test doesn't include testing the switch unless directed there.

Hope this saves someone else the aggravation. The Ford parts guy did tell me that a lot of his techs have a "test" switch they put in before doing any test, is a fairly common problem.

[liljoe]

Thanks, I have an 04 F250 comming thursday with innop cruise and a fuel leak, maybe this will save me time on diag the cruise. Thanks.

[Autohaus]

Got an '04 Crown Vic in the shop as we speak with similar issue. The brake deactivation switch on this model is on the brake pedal in the cab. All switch tests are showing normal, got the brake switched bypassed and swapped out servo with a known good unit. Still inop. Noticed a while ago that the owner left us the valet key. Would the valet key render the cruise control inoperative on this unit?????? Really at a loss on this one as the tests we are running all point to the servo being bad.

[Jeff @ Able Auto]

The E-350 had a brake pressure switch on the master cylinder that created the problem. I would look to see if the Crown Vic has a switch on the master. Was told by the guys at Ford that all the techs keep one for the Trucks to install for a quik test. Not sure if this applies to the Vic but would be worth a check.
I just checked the diagrams for a Crown Vic. It has a deactivator switch in left footwell that appers to work the same as the pressure switch on the E-350. Not exactly sure where it is in left foot well but worth a look.