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Putting lucid: caliper halves in the search box at top right corner above should yield a lot of posts from a few years back, when this (pre-ABS) problem was first discovered.
Key portion from a 2005 post is shown below:
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1. In the Girling 4-piston calipers, the upper two piston chambers basically form an inverted U, with ONE common bleeder at the highest point.
The lower two piston chambers form an upright U, with bleeders at each of the TWO high points.
2. Rebuilders sometimes get the INNER and OUTER caliper halves calipers mismatched. (i.e. The Left Side INNER half, where the lines attach, will have a Right Side OUTER half paired to it but that OUTER half will be upside down.
3. During the original assembly, Girling distinctly marks the bottom of each caliper half with a punched "dimple" mark next to the joint. So a mark on the TOP of an OUTER caliper half means a mismatch.
4. Such a caliper will have:
A - No fluid path to the Upper-Outer cylinder
B - No way to bleed the Lower-Outer cylinder
What appears to be the normal Outside-Lower piston bleeder actually leads upward to a dead end, at what should be a lower piston chamber.
And the misplaced Lower-Outer chamber has no bleed path except down and then up to the Inside bleeder.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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