Help?No overdrive!

rvcruiser wrote:
1997 Winnebago Aventurer
Chevy 454

-back brakes fixed
-left for Florida this morning
-after crazy time at Detroit border (another story)
Brakes started squealing again..same as before brake job
-then as got on hwy rv wouldnt go into overdrive
-had to pull off and wait for about one hour then
-got on hwy and rv went into overdrive fine
-same problem from Florida last spring that led me to having brake job done
-as soon as brakes r used..hear sqealing starting...then
no overdrive

very hard to drive never using brakes
anyone have any insite as to what could be causing this?

Sounds like the brakes are siezing and putting too much load on the engine and preventing trans to go into overdrive. Like the engine/tranny thinks the coach is going uphill or something. Check the brake/wheel temp next time it happens. Could be bad calipers, bad rubber brake hoses(?), bad master cylinder or, a long shot, but maybe bad brake fluid? When you say you had a brake job, what did they do?