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Brake valve opens, but won't bleed. Now what? 200

I tried brake bleeding the son's non-ABS 1988 245 today, a great opportunity for trying my new Power Bleeder for the first time. This car has an unknown service history, but luckily none of the valves were stuck. Only, the right rear opened, but no fluid came out. I unscrewed it completely, but still nothing. Three questions:

(1) Do I need a new caliper? Or is it just a matter of poking inside the valve openings with a suitable object to free it of whatever it is that's creating a blockage? (I should mention that the car brakes okay without any side pull, and both sides of the rotor are nice and shiny , so the caliper seems to be working as it should.)

(2) If I manage to free it up without removing it from the car, do I need to go through the whole bleeding process once again? The brakes feel firm now, after bleeding the other three calipers.

(3) The Bentley bleeding sequence puzzles me: LR, LF top, RF top, RR, RF both lower, LF both lower. The way I learned it in the old days was that you started with the one furthest away from the MC and worked your way towards it, like this: RR, LR, RF, LF. So I was taught wrong then?

BTW, the Power Bleeder was well worth its money, including postage to Norway. Recommended!

Thanks for any comments,
Erling.
--
My 240 Page






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