I can't get any oil flow between the reservoir and the rest of the system. I need some advise on how to troubleshoot this problem and whether or not this is a concern.
I have a Shimano Deore LX hydraulic system. While bleeding the rear break I noticed that the flow of oil to and from the reservoir is constricted. There doesn't seem to be any obstruction in the cable or the caliper because squeezing the break lever still activates the pistons normally.
I first tried bleeding from the reservoir. First I loosen the caliper nipple. Then I squeezed the break lever and as expected oil comes out of the nipple. I then tighten the nipple before releasing the break lever. As I understand, some time after releasing the lever the system should suck some fluid from the reservoir and the level in the reservoir should go down. This does not happen in my case. No fluid is sucked from the reservoir and as a result the pistons won't return to their original position. They remain somewhat retracted inside the caliper.
I then tried bleeding from the nipple. I inject oil through the nipple and the pistons come out and squeeze the spacer. Continuing to inject more fluid should cause the reservoir level to go up. However, in my case I cannot inject more fluid no matter how hard I press on the seringe.
Since the second bleeding (from the nipple) made the pistons come out against the spacers, the breaks seem to function. I am wondering if the breaks can be operated like this? If not, then how can I get the oil to flow to and from the reservoir?
I don't have this problem on my front break. Bleeding from the reservoir makes the level go down, and bleeding from the nipple makes the level come up. But not with my rear breaks.
Thanks in advance for your help
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Thread: Oil reservoir plugged
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