1. yes, definitely. And put in factory fluid if you aren't tracking it (or is Pentosin the OEM?).
2. only if you want to drag this out before paying for #1 plus paying them to refit the master cylinder (and redoing all the paint that will get eaten by brake fluid)
3. probably irrelevant - if there is still air in there, whatever you are doing isn't clearing it.
4. Not this. If you were satisfied with poorly functioning or unreliable brakes you wouldn't have tried bleeding them in the first place. And I'd much rather lose brakes on track vs. on the street.
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