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      08-24-2011, 05:45 PM   #12
piloto
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Drives: 2011 E90 M3 - AW/FR
Join Date: Jun 2010
Location: Orange County, CA

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Quote:
Originally Posted by NJBMWM3 View Post
I would love to hear what the pros have to say about the 2 small lines if there is any need to replace these.
Why wait for a "pro" to answer? I think the answer is pretty simple. It's a system, so you've now left the 2 small lines as the "weak" links. However, if you leave them as they are and replace everything else with stronger lines, then the amount of volume increase (something undersired) due to expansion in diameter of the line when under pressure will be reduced. Whether that reduction is sufficient, or whether that reduction would be significantly better with the 2 lines replaced depends on multiple variables, including the condition of your lines, your sensitivty in feel, to the temperature in the system at various locations (e.g. at the piston), the fluid, the age and condition of the fluid, etc.