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[tomk]

I'm 2nd or 3rd owner of a 2015 SR which I really like. I have bled brakes on an ICE bike but this one is different. Oil level was low on front brake, so I filled the reservoir and did what I thought was a bleeding routine, having added oil to the reservoir during the routine. So far, so good. Some time later, the reservoir was low. Refilled and the brake seemed good. Some time later, oil was low again. Underside of the bike is wet. Line from the hand lever disappears inside the body, so am assuming there is brake system hardware I cannot see.
Needing a clue, what to take apart first and what to watch out for and what to look for. Twenty years working on a potato-potato bike, and got no clues on this. I tried searching here, but apparently asking wrong questions.

[TheRan]

If it has ABS then the pump for that is just behind the headstock, not too difficult to get to by removing the tank plastics.

https://zeromanual.com/wiki/SDS_Platform/Tank_Plastics/Removal

This photo shows the rear brake lines going to and from the pump
https://zeromanual.com/wiki/File:SDS12VACCESSORYSOCKETKIT14MY10-0750401_overallviewlefthandside.jpg

[tomk]

Thanks for the info. I will get to this shortly, then.
Tom 2015SR

[Richard230]

If it has ABS then the pump for that is just behind the headstock, not too difficult to get to by removing the tank plastics.

https://zeromanual.com/wiki/SDS_Platform/Tank_Plastics/Removal

This photo shows the rear brake lines going to and from the pump
https://zeromanual.com/wiki/File:SDS12VACCESSORYSOCKETKIT14MY10-0750401_overallviewlefthandside.jpg

My recollection is that the 2015 Zeros did not have ABS, so that should make the problem much easier to sort out as the hydraulic line will go directly from the front brake master cylinder to the caliper and not to an ABS pump. The only places it could leak would be either at either end of the brake line. The leak might be stopped by tightening up the connection a little. If that doesn't work, the brake line will have to be drained and then removed and the sealing ring(s) at either end replaced. Then the system would need to be refilled with new brake fluid and the air bubbles in the brake line pumped out.

[TheRan]

I didn't think they had ABS until 2016 either, but he says the line disappears into the body of the bike instead of going straight to the caliper.

[Crissa]

Mine had the tiniest hole in the metal tubing from when my spouse dropped it.  Took a whole month to drain.

I thought it was much later for abs, but I found a 2014 article mentioning abs was being included in upcoming Zeros.  And part 75 of the braking system here indicates abs is included https://www.af1racing.com/store/ProdImages/st3/15SR.pdf

-Crissa

[tomk]

To all of you, thank you for your inputs and advice. The prudent thing for me to do is take off the tank plastics and eyeball this thing, to see what's what, just to make sure.
Good sens also tells me that I should see what kinds of projects my wife has for me, first...then to the bike.
Tom 2015SR