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Have you read through the archived threads here? I just searched on "brake pedal floor" (no ") and found several incl
http://www.brickboard.com/RWD/volvo/1499199/220/240/260/280/brake_pedal_goes_floor_still.html
I'd seen this one when I was having a spongy-pedal problem. The point above is that you can bleed in the traditional ways all you want but you can't get ALL the air out unless you force fluid through.
I don't remember what I did. Maybe just vacuum draw.
Now, if you had a bad internal MC leak I'd think you wouldn't see the caliper pistons move but I've never had a MC leak like that.
Does the fluid in the reservoir go down when you pump the pedal? And then slowly back up? Or does it not move at all?
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240s: 2 drivers and some parts cars
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