JOEPRO
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Opening them can be a massive pain due to the measures Bosch in their infinite wisdom put in place. And many parts are aluminium threaded into an aluminium body, and gall!
Some details off the top of my head.
Blue, proprietary torx style plug, can gall, extremely tight
Grey piston can get stuck in yellow thing
Brown spring (and puck which sits under the spring), the pucks are different thicknesses that go up in steps of 0.1mm. Don't mix them up!
Pink, different orifice sizes, not discernable really by the eye, again don't get mixed up.
Red threaded "nut" staked into green housing. Depth critical as sets preload of valve against spring (brown). Has a non removable mesh (orange) extremely fragile and if your tool (see below) slips then its ruined!
Also, the one photographed, is the culmination of 2 pumps to make a decent one. But it can take more than that, I'd say 2 is quite lucky.
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Red nut profile:
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Mega torx tool
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And everything else you can imagine can be completely stuck. If you have a classic car you love, please change your brake fluid often!
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Is that from a Mercedes? If so I have about 20x spare good used units of these from w124s etc - good to know and I do change brake fluid every couple of years as it is hydroscopic of course.