DkD Posted October 4, 2012 Share Posted October 4, 2012 Hi all, Some technical assistance please. Noticed the reservoir level dropped slightly over night and during my ride to work the level averaged on the minimum (half way mark) but when accelerating it went to maximum. When applying either front or rear brake the level dropped and was just noticeable. Of course coasted to work and called the stealer who can't inspect the bike till tomorrow. Given it's a major safety issue, won't be riding it given the brakes are the most important part. However, can anyone help with that it could be - just in case the dealer tries to fleece me with a major braking/hydraulic system overall. (The bike is a YBR125 custom 2012 - still under warranty but you never know what they might come up with as an excuse not to pay - if it is indeed serious!). Thanks all.. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted October 4, 2012 Moderator Share Posted October 4, 2012 Are you aware that he fluid will move back and forth in the resivoir while accelerating and braking. It why there is a minimum level checked when the bike is static. To be sure air cannot enter the system. The overnight drop could be thermal related too as it was bloody cold first thing. 4 degrees i think. Link to comment Share on other sites More sharing options...
DkD Posted October 4, 2012 Author Share Posted October 4, 2012 Thanks Cynic, knew there where minor level changes when moving etc but this seems to erratic. It goes from full level to nearly empty on braking. Although good point about overnight temp - didn't think about that. Will go out in a bit and check the level again (it stayed on minimum when I left it). Link to comment Share on other sites More sharing options...
Moderator Cynic Posted October 4, 2012 Moderator Share Posted October 4, 2012 Generally noticing the level drop is an indication of pad wear as more fluid is needed to fill the piston to push it onto the disk. The whole ppint of the resivoir really. That is the most likely. Whats your mileage. If your front heavy with your braking you could have some worn front pads. Link to comment Share on other sites More sharing options...
DkD Posted October 4, 2012 Author Share Posted October 4, 2012 Just done a little over 2,100miles.. Generally I'm braking 70-30 front /back on normal dry conditions. Most of my ride is in traffic so a fair bit of stop - starting. Brake pads seem fine though.... Link to comment Share on other sites More sharing options...
Moderator Cynic Posted October 4, 2012 Moderator Share Posted October 4, 2012 Looks like you just need a top up then. Maybe it was a little low from the off. Not low but not full either if you get my drift. Link to comment Share on other sites More sharing options...
DkD Posted October 4, 2012 Author Share Posted October 4, 2012 glass half empty / full jobbie.... Really appreciate the input there Cynic... cheers. Link to comment Share on other sites More sharing options...
neversaydie Posted October 4, 2012 Share Posted October 4, 2012 It may be something peculiar to your bike, but one pad seems to be in a different position to the other. Could be the photo, but it doesnt look right to me. Another photo? Link to comment Share on other sites More sharing options...
DkD Posted October 4, 2012 Author Share Posted October 4, 2012 Pretty sure it's the photo, will try get another one and upload it though.. cheers Link to comment Share on other sites More sharing options...
neversaydie Posted October 4, 2012 Share Posted October 4, 2012 I've had another look and I just can't make out the photo If the central object with the holes in it is the disc, then it appears to have a chamfer worn on it on the left hand side, and I can see what appears to be a reflection of the right side pad in the face of the disc, I wouldn't have expected to see that. What appear to be the 2 pads look as if they are in different locations on each side of the disc Link to comment Share on other sites More sharing options...
Moderator drewpy Posted October 5, 2012 Moderator Share Posted October 5, 2012 some yam pads come chamfered to match the calipers. have a look at some pictures of new pads and see the difference Link to comment Share on other sites More sharing options...
DkD Posted October 8, 2012 Author Share Posted October 8, 2012 Cheers gents, been away but will upload another picture(s) soon Bike with dealer at the moment so hopefully get some definitive answers. Link to comment Share on other sites More sharing options...
DkD Posted October 11, 2012 Author Share Posted October 11, 2012 Cynic you where correct! The level dropped due to the wear on the pads (abt 30-40% wear).. so top up is what I will do (although dealer said it's not needed). As for the brakes positions, they are all ok - think it must have been the angle of the photo.. Appreciate all the feedback - been very helpful. Link to comment Share on other sites More sharing options...
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