I bled my avid juicy ultimates today and everything was OK until I got up to the lever. As I started pulling on the syringe to pull any our out of the lever and the system, whilst pulling the brake lever a few times as directed to in the instructions, air seemed to just flood through. The brakes were really bad to begin with but I so much air was coming out that I had to take off the syringe and push out the air, then do it all over again. I did this quite a few times as I wasn't sure whether pulling the brake lever was letting out some trapped air or if it was actually leaking air into the system somewhere.
This was happening on both levers. To finish both of them off I pushed in on the syringe to make sure there was positive pressure on the system. Then closed the syringe. The back brake though just didn't work. I went outside to try the bike out. Both brakes were working, however not well at all. As I kept trying them out pressure was being lost in the rear brake to the point where it doesn't do anything now and the lever just pulls back to the bar. The front brake hasn't got that bad but it doesn't lock on as well as it should and if I kept riding it I am guessing it will also get worse.
So my question is, where is the leak? In the lever or in the caliper? There doesn't seem to be any fluid coming out anywhere which is very confusing! When the back brake stopped working completely I took the wheel off and took the pads out. I then started to pull the brake lever repeatedly to see what was happening. One of the pistons seemed to pretty much come. I think it would have if I hadn't stopped and pushed it back in! There did seem to be some fluid coming out then when it got that bad.
So do I need to buy replacement pistons and seels or replacement reservoir/bladder and seels for the lever? I think they are about £10 for each which isn't bad. But if I replace the lever and caliper parts on both brakes all of a sudden I'm looking at over £40 which I don't want. So how do I work out where the problem is?
Lastly, which bits do I actually need? Some are described as for all juicy systems and some are specifically for the ultimate. Not surprisingly the ultimate are more expensive;http://www.ukbikestore.co.uk/product/13 ... 1-pc-.htmlhttp://www.ukbikestore.co.uk/product/13 ... 08-09.htmlhttp://www.ukbikestore.co.uk/product/13 ... rnals.html
Will just these seels be ok if it's the caliper that is the problem or will I need the pistons too?;http://www.ukbikestore.co.uk/product/13 ... -1-pc.htmlhttp://www.ukbikestore.co.uk/product/13 ... t-kit.html