January 30, 201115 yr I found a small leak in the breather pipe on my rear brake. I took the master cylinder off and got all of the crap out from behind it. I've now fitted new pads too and reverse filled with fluid. If I use a syringe on the bleed nipple and also one on the breather outlet I can easily push fluid between the 2 syringes with no bubbles. If I tighten the nipple, it pushes both pistons out with no problems at all. As I push the piston in, it fills the syringe. Everything seems great... But whenever I push the master cylinder, either with the pedal or with a screwdriver I have no movement. Is this likely to be the seals or could it be the m/c that is knackered? Surely I don't need to bleed it anymore? Any help much appreciated. Rich
January 31, 201115 yr I found a small leak in the breather pipe on my rear brake. I took the master cylinder off and got all of the crap out from behind it. I've now fitted new pads too and reverse filled with fluid. If I use a syringe on the bleed nipple and also one on the breather outlet I can easily push fluid between the 2 syringes with no bubbles. If I tighten the nipple, it pushes both pistons out with no problems at all. As I push the piston in, it fills the syringe. Everything seems great... But whenever I push the master cylinder, either with the pedal or with a screwdriver I have no movement. Is this likely to be the seals or could it be the m/c that is knackered? Surely I don't need to bleed it anymore? Any help much appreciated. So I am guessing all this started with it running low on fluid due to a leak at the rear bleeder port? Crack the hose fitting at the master cyl and fush fluid through the hose up to there with your device from the rear, then also pump all the air out of the MC with the pedal, and the line nut still loose till you can snug it up free of air. This usually works.
February 2, 201115 yr Author Cheeers Cope! I took the seal out and it was covered in grit and not in the best condition. I replaced it as the circlip was also rotten and fell into pieces. It still took forever to bleed it, I think I was being too fussy expecting both pistons to push out together. However all sorted now, and I am not going anywhere near the back brake again!
February 2, 201115 yr Cheeers Cope! I took the seal out and it was covered in grit and not in the best condition. I replaced it as the circlip was also rotten and fell into pieces. It still took forever to bleed it, I think I was being too fussy expecting both pistons to push out together. However all sorted now, and I am not going anywhere near the back brake again! All good then. If that was the case, there may have been a tear in the boot where the rod goes into the MC. Packing underneath with silecone grease helps as well. A little lesson for others here, as this is often overlooked untill ultimatly fails. Edited February 3, 201115 yr by copemech
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