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I've just changed all my brake calipers, discs and pads on my 2005 MGTF.

3 out of 4 of the cylinders bled out ok. The NSF caliper seems to only be trickling fluid even with the bleed nipple fully removed - a garage has also tried bleeding and found the same and suggested maybe the caliper is faulty. With a replacement caliper fitted, it's slightly better but still nowhere near the others. The car stops fine.

I am thinking that perhaps there is a fault in the ABS modulator or a blockage (the old fluid looked awful)? There was also an advisory/fail on an MOT a number of years ago due to brakes being imbalanced across an axle.

I have a new modulator on order as even if I don't change it now, I'm guessing it'll fail at some point along with a new mounting for it as the current one is pretty rusty. I didn't order it from Rimmers but their website suggests it needs programming before fitting with the T4 Testbook. Is this actually required for it to work at all or can it be fitted and then adjusted at a later date by a dealer/specialist?
 

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'06 MG ZR +120 (HQM) '04 MG ZR 105 (IAB)
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I would think a blocked flexi-pipe to the caliper is the first suspect tbh. They do sometimes degrade internally leaving the tube partially blocked. Surprised if the garage didn't check this (then again, perhaps not!)

Very unlikely that the modulator has a problem - modulator failure is not a common problem (very, very rare I think - don't think I have heard of anyone on the forum having a problem with one).

I don't think the modulator needs programming as such, but using T4 gives access to a setting to open all the modulator valves to ensure full bleeding of the unit (without doing this, the valves will only open and bleed if the brakes are used hard enough to trigger the ABS system).
 

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MG TF
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I can only echo what Man in the Car has written, I would be changing the flexible pipe first and I also cannot remember ever seeing that an ABS unit has failed unless it has suffered some trauma such as front end collision. I suspect that is why you are not getting many answers about the need to reprogram the unit using a T4.
 
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