As I posted on another thread I had EXACTLY the same problem: having failed on rusty rear calipers (the tester told me it was the master cylinder [:(][:(][:(][:(]) this was fixed and he failed it again for the delay on the rear. Took it back to my brilliant local indy Cit agent who took it straight back, stood over them while it was tested and it passed!![:D][:D][:D]
I really worry about some testers: this one was new to this station (although not young) which I have used for years without problem, but the owner would not overrule his new tester and would not even contradict him over the master cylinder. I would love to have been there when the Cit. expert took on the moron of a tester.[;)][;)]
Fortunately the retest was free so it was only time that was wasted[:)][:)]
MOT failure Xantia
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