Over drive shuts off when brake pedal is pressed (again) Ford F53

[Wallnut]

I still cant resolve this problem.  I have a 98 Catalina Coachmen, F53 chassis, E40D transmission, 460 engine.  When I press the brake pedal, even slightly, the overdrive "off" light comes on and the overdrive shifts out. Following some suggestions from this forum, I looked for worn/chaffed wires in the area of the brake pedal.  Everything looks fine.  I removed the brake switch itself and actuated the switch by hand and the problem persists.  So it "seems" coincident with the switch. (brake lights work normally). If anyone has a schematic, I am curious as to how current is getting to the overdrive through the brake pedal switch.  Sure would appreciate your help before I have to take it to the shop.

Thanks.

JR
Covington GA

 

[Gary RV_Wizard]

It might be worth a call to Ford Customer Assist to see if it is working as designed. It is usual for a touch of the brake to deactivate cruise control, so I wonder if in '98 Ford was considering OD to be like cruise?

 

[Just Lou]

JR, post your question over on the F53 forum of IRV2.  There are a couple of guys over there who have the necessary reference manuals for the F53 and are very willing and eager to help.

 

[SeilerBird]

Maybe it is a feature and not a bug.

 

[Just Lou]

It might be worth a call to Ford Customer Assist to see if it is working as designed. It is usual for a touch of the brake to deactivate cruise control, so I wonder if in '98 Ford was considering OD to be like cruise?

The '97 F53 certainly doesn't work that way.  My '98 Ford Explorer doesn't work that way either.

 

[Wallnut]

Thanks for your thoughts guys, but I have had this class A for over a year and I have never noticed this happening.  I think it would have been obvious because the way it is acting now, I have to manually select overdrive "on" with the button once the motorhome is moving.  Not being in overdrive is pretty apparent. If it is a design feature, maybe my problem is the transmission NOT shifting back into overdrive.  Now Im really confused.  I'll try the other web site.  Thanks for the suggestion.

JR

 

[rls7201]

Oops

 

[bucks2]

Years ago when dimmer switches and starter buttons were on the floor, overdrive transmissions used a sprag clutch which freewheeled when coasting. This added to fuel economy but provided no braking effect from the engine/transmission. Maybe what's old is new again. Or it could just be broken.......

Ken