MOT "Service brake imbalance requirements only just met. It would appear that the braking system requires adjustment or repair. Rear (1.2.1(b)(i))"

Just got the k13 back from the MOT garage, passed with advisory:
"Service brake imbalance requirements only just met. It would appear that the braking system requires adjustment or repair. Rear (1.2.1(b)(i))"

Looks like a full service job on the rear drum brakes or maybe a problem with a valve somewhere near the master cylinder.

update: seized slave brake cylinder.


update 2: For anyone who is interested, the new part number is: Blue Print ADN14486 Wheel Cylinder

IMG_20220824_131225.jpg

Checked the other rear wheel and that cylinder is seized also.
 
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Just to update this thread, the abs unit was the culprit all along. If you get a brake imbalance advisory on your MOT, start with the abs unit. Fitting new brake pistons, seals, hoses etc won't do anything.
 
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