mine has done that some too, i think its in the master cylinder. the fluid in mine was very dark and flushing it has reduced the occurrence of this for me. i haven't changed my master cylinder yet though because i cant open a single bleeder, so i haven't had a huge sudden change. (flushed by sucking out and refilling master cyl, and extending and compressing pistons/cyls... hoping to do major brake rebuild this year, including all flexible lines which might be a potential cause of this too, although i doubt it) im guessing you have rear discs, but if you have drums, adjust them. they don't seem to automatically adjust for many ppl
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