That's right, brake hose replacement (or adjustment) does not require removal of the caliper. When you loosen the line at the top where it connects to the hard line, it is the hard line nut that turns. Once that is loose or off, you then can turn the brake hose in the caliper with no restriction.

That's about the only way to accurately get the brake hose installed without any twist.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles