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kbh · 15-06-18, 06:42 PM

Sorry to dredge up what should be another simple topic and questions that have been asked a 1000 times before i know and yes i have searched topics but i have exhausted all the options i think.

As you may not know, the bike was left standing for a few years and i am still rebuilding it and have left what i thought would be the easiest job until last. Oh how wrong was I and i have never had problems like it before!

Part of this meant the calipers had to be stripped & cleaned. When i rebuilt them i purchased new OEM pistons and seals (dust and main seal groove was also cleaned out) and they were rebuilt with red grease. Caliper slides & boots were cleaned up and re-greased with silicone grease.

New stainless nipples have been put in and belt and braces, the thread was wrapped in some PTFE.

New stainless lines have been put in - 3 line set up so the original splitter is still in place.

Master cylinder has been rebuilt using a kit and the inside bore is smooth and the tiny return valve hole has been checked to make sure it is clear.

No matter how i bleed, i can't seem to get the lever hard.

I have tried bleeding the traditional way - pull lever, open nipple, let fluid come out, close nipple, release lever - repeat until no more air bubbles come out.

I have tried reverse bleeding from the nipples with a syringe

I have tried reverse bleeding from the nipples with and Gunson Easibleed pressurised from a tyre.

I have cracked all the banjo's to make sure there was no air hiding anywhere here, whilst using the lever method.

I have tied the lever back to the bar overnight with the top loosely on the reservoir

I have taken the calipers off and pushed back and pumped back out the pistons separately in case their was an air pocket behind the pistons.

Tried all the above with the bike on an Abba so it was level and then on the side stand and making sure the MC was at the highest point.

The brakes do seem to apply when i use the lever and release when i let go, it's just the lever is not firm and very easily pulls all the way back to the bar, no matter what i do i just can't seem to get any pressure built up?

Any ideas as to what i may have missed please as i thought i had all bases covered and with all new parts, i wouldn't have thought i would of had these issues and have never been caught out like this with brake bleeding in the past.

Thx

15-06-18, 06:42 PM	#1
kbh Member Join Date: Feb 2009 Location: Crowborough Posts: 69	Bleedin' Brakes Sorry to dredge up what should be another simple topic and questions that have been asked a 1000 times before i know and yes i have searched topics but i have exhausted all the options i think. As you may not know, the bike was left standing for a few years and i am still rebuilding it and have left what i thought would be the easiest job until last. Oh how wrong was I and i have never had problems like it before! Part of this meant the calipers had to be stripped & cleaned. When i rebuilt them i purchased new OEM pistons and seals (dust and main seal groove was also cleaned out) and they were rebuilt with red grease. Caliper slides & boots were cleaned up and re-greased with silicone grease. New stainless nipples have been put in and belt and braces, the thread was wrapped in some PTFE. New stainless lines have been put in - 3 line set up so the original splitter is still in place. Master cylinder has been rebuilt using a kit and the inside bore is smooth and the tiny return valve hole has been checked to make sure it is clear. No matter how i bleed, i can't seem to get the lever hard. I have tried bleeding the traditional way - pull lever, open nipple, let fluid come out, close nipple, release lever - repeat until no more air bubbles come out. I have tried reverse bleeding from the nipples with a syringe I have tried reverse bleeding from the nipples with and Gunson Easibleed pressurised from a tyre. I have cracked all the banjo's to make sure there was no air hiding anywhere here, whilst using the lever method. I have tied the lever back to the bar overnight with the top loosely on the reservoir I have taken the calipers off and pushed back and pumped back out the pistons separately in case their was an air pocket behind the pistons. Tried all the above with the bike on an Abba so it was level and then on the side stand and making sure the MC was at the highest point. The brakes do seem to apply when i use the lever and release when i let go, it's just the lever is not firm and very easily pulls all the way back to the bar, no matter what i do i just can't seem to get any pressure built up? Any ideas as to what i may have missed please as i thought i had all bases covered and with all new parts, i wouldn't have thought i would of had these issues and have never been caught out like this with brake bleeding in the past. Thx