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Help! Cranky M5 on rainy weather

876 Views 3 Replies 2 Participants Last post by  balmo
Just got this issue as I hoped in to get lunch. It seems that if it is very wet and rainy, my brake are very spongy. and this sponginess in turn affects idling, it is very rough and sometimes stalls the engine. Check engine light is on so I'll ask my co-worker if I can borrow his Peake reader.

I have started to notice this every time I go to the car wash. That's why I stopped going there anymore.

Off the top of my head, I can think of brake lines + water plus brake booster + vacuum. Any suggestions?

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