Help bleeding blakes with the Mityvac
i had tried bleeding my brakes earlier with just a rag and a wrench but pumping the break lever was a pain and it was messy.
so I bought the Mityvac yesterday at cycle gear along with some other stuff to do my own maintenance on my bike. Well the mityvac is pretty simple, i read through the directions and followed the steps.
just hook the joint to the bleeder valve on the caliper closest to the master cylinder reservoir, then to the first section of tubing, then the second section of tubing, then to the mityvac reservoir and then to the mityvac pump. filled the master cylinder reservoir with fresh dot4 fluid. then opened the bleeder valve on the caliper and pump about 10-15 times on the mityvac pump. instantly you can see the fluid flowing through the tubes with a significant amount of air. probably 3-5 medium bubbles per second. well whenever the brakes are bled there should be only very tiny bubbles coming out steadily, and those are bubbles that come from around the joint that hooks to the bleeder valve, but no matter how much i bled them there were constantly big bubbles coming through, but i figured that it must be due to the seal around the joint being weak so i just closed it off and did the same thing to my front left caliper, and getting the same result.
well my brakes don't feel more firm than they did before, which is when i bled them by hand with a wrench and rag. what am i doing wrong!!??
Last edited by russell; 03-19-2008 at 10:23 AM.