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Rebuilders have been known to mis-match the halves of the L/R front calipers.
Details from an old post below...
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1 — In the Girling 4-piston calipers, the fluid passage for the two upper cylinders is basically an inverted U, with ONE common bleeder at the high point.
The lower cylinder fluid passage forms an upright U, with bleeders at each of the TWO high points.
2 — Rebuilders sometimes get the INNER and OUTER caliper halves mismatched. That is, a Left Side INNER half, where the lines attach, could have a Right Side OUTER half mated to it — but that OUTER half will be upside down.
3 —The reversal is not obvious because the two lower bleeders are centered on the caliper body. However, Girling punch-marks the bottom of each caliper half with a "dimple" next to the joint during factory assembly . So a dimple on the TOP of an OUTER caliper half means a mismatch.
4 — Such a caliper will have:
A - A redundant (outer) bleeder from the two upper cylinders
B - No bleeder path for the Lower-outer cylinder
What looks like the Lower-outer bleeder actually now leads upward to the top bleeder. This means that fluid pumped into the upper inlet port can come out two bleeders—the normal upper one and the now redundant outer one.
And when you think you are bleeding both lower cylinders, the outer one actually has no bleed path. It's dead-ended where the outer bleeder would normally be. This means that a successful, air-free bleed operation is impossible.
Searching on Mismatch or Mis-match will probably get some hits.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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