Thread: My 2013 FRS has a knocking sound but only in low speed
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Old 02-24-2020, 03:59 PM   #6
ClevelandFRS
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Drives: Scion FRS 2013
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Quote:
Originally Posted by Tcoat View Post
Brake booster pump on the AT cars. It is not an uncommon issue really.
You can wade through the wild guesses in this thread but the pump will most likely be it.


http://www.ft86club.com/forums/showthread.php?p=2447589
Vacuum pump was my guess. Well, at least it wont be super expensive if that is the issue. Sigh...
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