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I would think the bubble would float up and into the brake fluid container, wouldn't it? I've replaced those switches on my 87 and 88 cars and I'm pretty sure I got at least a little bit of air in the system when I did it but still have normal brake pedal pressure afterwards. I still think it's not the best design..some have bypassed the hydraulics.
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Buck
'88 Coupe, '87 Cab,
'88 535i sold, '19 GLC 300 DD
Warren Hall, gone but not forgotten
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