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My Dyna did this after towing a trailer with suspect brakelight wiring. Try checking the 7.5A fuse labelled ICU-IG & replace if nessesary (after assuring yourself the fuse labelled STOP is still intact). Mine blew both fuses twice before I sussed it so it's most likely that this is your issue also & is a simple fix. If it's not those 2 fuses & that's quite unlikely, you'll then probably need to replace the electrically controlled vacuum actuator on exhaust pipe. Good luck- Enjoy:)

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Q: Exhaust brakes on 1994 Toyota dyna bu 68 not working light on dash works and switch on gas pedal seems ok?
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