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[TheBoy]

With relation to this, as seen on another thread...










They all cleared.  I've done enough checks to be around 95% certain it's not electronically or electronic, or the battery.

I appears the brake pedal is slow to return when foot removed, and most likely those errors and associated codes caused by the brake switch still being activated whilst driving, including a code for Brake/Accelerator pedal signals implausible type codes.


I can reasonably consistently get both brake switches to say pressed without foot on pedal, but very gently touching the brakes, and then gently releasing.  In this scenario, if you put your foot under the pedal, you can lift pedal back to its standard position.

This aligns with the driving symptoms of a feeling the brakes are slow to release, and using gearbox drag to edge forward is inconsistent and difficult.

[TheBoy]

Undo the activation rod from the pedal (though can't remove anything without significant further disassembly), and the pedal pivot feels free, and pedal spring working.

With the nut that screws on the activation rod to clamp to pedal loose, the pedal is free one the allowed movement, but the rod seems to "catch" right at the end of its movement (the end of no braking pressure).


Servo?
Master cylinder?
Something else?

[YZ250]

Can you read live data from the vacuum servo sensor. Not sure I’ve ever seen it, but then again I’ve never been directly looking for it. Although in saying that, lack of servo pressure is usually associated with a hard pedal. 
If the brake pedal pivots are ok, could there be air in the system.   
The inconsistency of gearbox creep would suggest either brake binding or ‘Hill Hold’ being activated, but neither would throw those faults or cause a lazy brake pedal.   
Hope you manage to find the cause.