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))"

[davidxzy]

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



Checked the other rear wheel and that cylinder is seized also.

 

[davidxzy]

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.