I've never seen it recorded before, but it is a very common fault to find brake bleed nipples over-tightened (sometimes to the point where they shear or crack the alloy casting). Girling states that "a torque of 4 to 6 lb. ft. should be applied, which is sufficient to lock the bleed screws up without damaging the orifices of the ports. If the orifice has been enlarged and the tell-tale black ring can be seen on the conical seating, then this is a sure sign of over-tightening."!

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