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Hi,
It has been my experiences on my the six 240s I own three have always lost the right rear first enough to be replaced.
The reason for this in my mind and with some physics of nature applied it’s more than just a happenstance.
The right rear is the farthest away in distance of the whole system. Moisture in the brake fluid seeks cold or is driven away by heat. The front calipers do more work, thus more heat and the master cylinder is in the engine compartment.
The caliper is more likely the culprit. It has items that can corrode the brake lines and hoses are not. The metal lines are made of Cupro-nickle. Guess what it’s made of? (:-)
I believe it was a Volvo invention or they first used it? I can remember when the fifties and sixties American vehicles had line rust throughs.
I cannot say when rubber lines were first used but I’ll bet everything was ruined. The Drum brakes, slave cylinders were inexpensive and were affect by the steel lines in the first place.
Rust jams up in tiny places like nuts and bolts.
Go with a caliper replacement first and a good flushing of the system and catch it all to study.
The darker the fluid the worse the it is.
I exchange the fluid out of just the reservoir one every year or to keep it mostly clear.
The new fluid helps keeps the rest of the system with less moisture in it. New fluid is dryer and moisture goes to a dryer place as moisture has more energy in it and thus will migrate to be in balance.
Heat always goes to colder. Never the other way around. Physics
Ice cubes get smaller in the freezer. Fog can develop on the coldest side of a windshield.
Post back your findings as there are many others that may ask the same question while looking for answer.
Knowledge is power, if you know where the information switch is.
Phil
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