405 front drum brake advice

[GlennBurnage]

Firstly, many thanks for all the advice and pointers so far from all the repliers.
Yesterday I had all ratchet bars off and inspected again, reassembled and refitted. Prior to this I had everything off whilst awaiting new s/cyl seals. Bleeding, using an 'Easybleed' presurised system went smoothly with no apparent restriction in flow on the front brakes, or on the rears when they were bled.
Took it out for a test run accompanied by my trusty IR temerature gun. The readings taken were from the hottest part of the drum:-
NSF-28.0c OSF-45.0c NSR-35.0c OSR-35.0c
This showed that all were ok except the off-side front! During the short test drive, under braking, the car was noticably pulling to the right, the OSF doing more work than its partner. All this could suggest a hose 'swelling' problem, but the pipework is solid (copper?) up to where it passes through the body and braided s/s from there to the drum, so I don't think that the famous 'swelling pipe scenario' could be the cause, or a sticking master cylinder seal/piston.
Further investigation will take place over the weekend and I may have the M/cyl off for inspection as the rear brake temperatures (hotter that the NSF) could possibly mean there is a bit of stickiness there, we'll see.
Glenn.