So.. I'm about to reveal my newbieness here, but I've got a question about the rear brake fluid reservoir. I'm doing a long group ride this weekend. So, I decided to run through all the 600mi maintenance checks last night, and when I went to check the brake fluid level in the rear reservoir I was a bit surprised by what I found. I tool the cap off and saw no fluid at all. Just a rubber membrane that looks kind of like a partially inflated balloon. The rear brake definitely works and doesn't feel mushy (at least no more than usual). So, what the heck is this rubber thing inside the reservoir and how is it that the brake works fine with no fluid??
Check that the brake fluid level in the rear brake reservoir is above the lower level line. If the fluid level is lower than the lower level line, remove cap and rubber membane and add DOT 4 brake fluid to fill reservoir to the upper level line.
•Follow the procedure below to install the rear brake fluid reservoir cap correctly.
○First, tighten the rear brake fluid reservoir cap clockwise by hand until slight resistance is felt indicating that the cap is seated on the reservoir body, then tighten the cap an additional 1/6 turn while holding the brake fluid reservoir body.
That's what confused me most.. is that membrane supposed to be inside the reservoir or is it meant to be inside the cap and act as a seal between the cap and the reservoir. When I opened mine up, the membrane was down inside the reservoir.
This is how the membrane and teflon spacer sit on top of reservoir, underneath the cap. It will then stay in the cap as seen in second photo. My fluid is at lower level. It should be filled to 'upper' line, just under bottom of membrane. I'm replacing mine for Motul synthetic DOT 5.1... DO NOT use silicone based DOT 5.
Carefully clean cap and membrane before reinstalling.
Make sure cap and area is clean as possible. You don't want dirt falling into the Res.
2005 50cc scooter, 2007 GS500f, 2008 DL650 Vstrom,
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