To keep the reservoir from going empty. Just like brakes, if any air gets in the system, it can be a pain to get out. Air in the pump could damage it.
LX570 AHC Globe/Accumulator Replacement
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roadsalt
Crusty 05 LX470
I see. So a full and thorough flush isn't a thing. Just bleed as instructed and move on.
You can thoroughly flush, but you'll need to keep the system topped with clean fluid as you do it. So a "flush" in the sense that you empty the system, then fill up with new fluid, is not advisable. But just as with brakes, if you can suction some old fluid out of the reservoir and replace with new fluid, it will reduce the amount of old fluid you need to bleed out.
roadsalt
Crusty 05 LX470
Appreciate you. Hopefully 3 cans will be sufficient.
And I'm having trouble with the socket situation for the globes. 21mm and 13/16mm are too tight. 22mm has a slight amount of give. Whats this grounding down business? Sorry I just don't want a nightmare on my hands after I start.
The grinding is to reduce the chamfer on the end of sockets that have a rounded lip. That allows the socket to fit a little deeperI. I found the 13/16 socket to be a nice snug fit. You should be able to tap it on with a hammer. It does not sound like you need to grind it.