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blue_painted Nova Slayer
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sickpup Old Timer
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Polarbear Super Spammer
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blue_painted Nova Slayer
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- Super Spammer
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Easy-X |
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Easy-X Super Spammer
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 11:25 - 08 Nov 2019 Post subject: |
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You also sometimes get a small bubble sat behind the top banjo bolt at the top of the brake line. Putting a rag under it (to catch any fluid) and "bleeding" the top banjo bolt in the same way you would the calliper sometimes rewards you with a little fart of bubbles. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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- Super Spammer
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Posted: 15:55 - 08 Nov 2019 Post subject: |
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Easy-X wrote: | mpd72 wrote: | Another idea is to fill a thump pump oil can with brake fluid, attach a hose to the bleed nipple and slowly pump fluid in from the bottom, opening the lever at the top to allow air to escape.
It pushed air up the system from the bottom instead of trying to bleed downhill. Air tends to rise, not fall. |
Is that what they call "reverse bleeding" ? |
I suppose so, but you're not really bleeding it, just filling it from the bottom up, which pushes the air to the top. After doing this, I normally bleed the system from the top down as normal. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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xX-Alex-Xx |
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xX-Alex-Xx World Chat Champion
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Posted: 17:53 - 08 Nov 2019 Post subject: |
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Vacuum pump for the bleed, and cable-ties holding the brake lever back ovenight has always worked for me.
When I did the GSR's brake lines this year (convert from rubber to braided), the lever still felt a bit spongy after the change, but the brakes worked a LOAD better even with the feel. Just an excuse to upgrade to a radial master ____________________ DILLIGAF |
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Hong Kong Phooey |
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Hong Kong Phooey World Chat Champion
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steve the grease |
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steve the grease Crazy Courier
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Robby |
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Robby Dirty Old Man
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Hong Kong Phooey |
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Hong Kong Phooey World Chat Champion
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Posted: 23:13 - 09 Nov 2019 Post subject: |
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steve the grease wrote: |
Just an observation , when the lever is pulled back to the bar then surely it won't bleed as the master cylinder and reservoir are isolated from each other . Once the lever is pulled in maybe 10mm the piston passes the filling hole,other wise how would the piston generate pressure to operate the brakes as you pull the lever? |
Witchcraft.
I think the pressure makes the smaller bubbles even smaller still, enough to "dissolve" into the fluid, and as the pressure exerted doesn't force the brake fluid molecules any closer, means the smaller air, now with less surface area drag, becomes mobile enough to find its way through the fluid filled lines and eventually upwards to the master cylinder. Once you release the lever pressure the bubbles are pumped out to the reservoir.
A huge bubble, just like a bog blocking turd, will still prove troublesome to flush through using that method. These should be flushed using the usual way. ____________________
'81 CG125, '97 FZS600 : '99 CBR600F4, '09 KTM RC8 |
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blue_painted |
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blue_painted Nova Slayer
Joined: 04 Aug 2015 Karma :
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Posted: 11:57 - 10 Nov 2019 Post subject: |
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Well then .... this is what I did ...
1. Hooked the caliper to the bar-end (was already unmounted) bleed nipple uppermost
2. Bled and tapped (handy piece of wood) - got quite a few biggish bubbles
Put the caliper back - still spongey but no longer "as fuck" ...
3. Cable-tied and left over night
Feels good now but other crap (doing accounts) means I can't test it yet.
Thanks all for the help and advice. ____________________ GP-100 -> CB250RS -> CBX550F2 (pause) KR1S -> RD350YPVS -> ZX6-R (pause) CD200 ->Mash 400 -> T100 (current) & (R1100RT scrapped pile o' shite) (CB250 Nighthawk - SORN in shed) Meteor 350 (current) |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 14:32 - 10 Nov 2019 Post subject: |
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steve the grease wrote: |
Just an observation , when the lever is pulled back to the bar then surely it won't bleed as the master cylinder and reservoir are isolated from each other . Once the lever is pulled in maybe 10mm the piston passes the filling hole,other wise how would the piston generate pressure to operate the brakes as you pull the lever? |
Yes, it's when you release it from being tied back that it bleeds the air.
Think about it. When you pull the lever the first thing it does is pump whatever is in the master piston down towards the calliper, including any air.
So you tie the lever down for a bit, any air bubbles find their way to the top of the system then the first thing you do is release the lever, allowing them to pop back up into the master cylinder reservoir.
I also suspect the (comparatively huge) pressure of a fully applied hydraulic brake will squeeze the air bubbles down to a smaller size which makes it easier for them to find their way to the top. Releasing the lever will see them expand again, just as they are (hopefully) sat directly below the return hole to the reservoir. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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JackButler |
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JackButler Traffic Copper
Joined: 11 Nov 2019 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 22:24 - 11 Nov 2019 Post subject: |
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At a mechanics they fill the reservoir, put a clear hose on the nipple, crack it open and go do something else for half an hour. they top up the reservoir if they are walking past.
Gravity does the rest. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Old Thread Alert!
The last post was made 4 years, 159 days ago. Instead of replying here, would creating a new thread be more useful? |
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