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The pistons should move out enough to fill that 3 or 4 mm, and only pull back a fraction. In fact the square section seal in the calliper is twisted a bit as the piston is pushed, and untwists to pull the piston back a fraction, leaving the pads free of pressure on the disc. That's why blocked hoses are a problem, as the fluid pressure stays high and the pads continue braking. A car program on BBC TV (so it must be true) poured fuel (gas) on a hot manifold (header) without it catching fire, but normal glycol fluid burst into flames at the same temp. Makes you think! I think the casting marks just identify the mould used. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org