Of all the seemingly simple jobs on 240 upkeep, I absolutely hate to bleed brakes. Lusy track record.
Therefore here is my MC change method to avoid that task.
Combine the job with replacement of front pads, if appropriate.
Overview: (1) Set things up to minimize the time during which the brake lines are actually disconnected fromthe MC. There will be a small amount of air get into the lines, but it should all be in the vertical lines from the MC down to the junction block.
(2) After installing the MC, do the front pad job. The action of pushing the pads back into the calipers will push a good bit of fluid back up into the MC (in fact, you should wrap the MC filler cap area with an old towel or smething, to keep fliud off the paint). The fluid where the air bubbles are located will be pushed back up, thus the air bubbles are eliminated. Neat. Works for me.
You should bench bleed the MC first.
Here's how (1) gets done: First loosen the brake line fittings a good bit and then retighten them finger tight. Then remove the nuts holding the MC onto the car. 17mm, I think. Next - helps to have a helper here - remove the brake lines, hand the old MC to helper, put new one on studs and finger tighten the lines.
Nuts and fittings can be wrench tightened later, just get the lines closed off.
Tighten the nuts holding MC to car, then the flare fittings.
Good Luck,
Bob
:>)
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