I have seen premature deterioration of brake wheel cylinder seals that I attribute to the use of DOT 3 in Volvos that we have serviced over the near 40 years of working on old Volvos.
I have read posts at some British car sites that refer to the same issue.
Volvo recommends DOT 4 and that is all I use in all my customers cars with non silicone based brake fluids.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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