I'm still a little dubious about the master cylinder being failure prone, there have been more documented failures of the heavy duty CSC then the master cylinder. If some shops are lying about replacing parts and sending cars back in non-working condition what makes you think they are even replacing the CSC instead of just topping off the fluid and sending the car back. I think there have been only 3 people here that actually know their MC went bad one of which had multiple failures which leads me to believe something else is causing it rather then getting multiple MCs in a row that are defective. I think it's more effective to say make sure the shop actually does the work they say they do rather then say all MCs are weak and need to be replaced.
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