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-   -   Bleeding brakes won't bleed! (http://forums.sv650.org/showthread.php?t=209253)

thefallenangel 16-04-14 12:05 PM
Bleeding brakes won't bleed!
 
The brakes on the sv were bad enough to bleed but on my speed four are worse. Fitted new lines and one man bleed kit. Nothing came through from the res. Dropped the lines off the master cylinder and a small amount of fluid came out but didn't seem like a great deal. so I filled thw res and left the lever cable tied over night and still no difference in fluid level. I have ordered a hand pump bleeding kit and new master cylinder parts. Can someone please point out what I missed?

Machine 16-04-14 01:32 PM
Re: Bleeding brakes won't bleed!
 
Rather than pumping the lever try squeezing the rubber reservoir link pipe hose it works better than the lever method.

Sid Squid 16-04-14 02:27 PM
Re: Bleeding brakes won't bleed!
 
Describe exactly the method you use for bleeding.

21QUEST 16-04-14 04:54 PM
Re: Bleeding brakes won't bleed!
 
Have a look at the links below

http://forums.sv650.org/showthread.p...leeding+brakes

http://forums.sv650.org/showthread.p...brake+bleeding

http://forums.sv650.org/showthread.p...light=BLEEDING

Ninthbike 16-04-14 06:45 PM
Re: Bleeding brakes won't bleed!
 
Easiest way is with a big syringe and some clear hose. I bought a kit like this from ebay and did the job easily and in double quick time.

thefallenangel 16-04-14 08:33 PM
Re: Bleeding brakes won't bleed!
 
Exact method

1. Fill res with fluid, crack left caliper bleed nipple put one man bleed on the end and watch for fluid to come down and air escape by pumping. Fluid was settling at the bottom about 1/4 of res then fluid didn't drop any further. bought new one man kit same issue.

2. Disconnected lines and tried pumping against my finger covering where lines connect onto cylinder. Not that much pressure or fluid coming through.

3. Filled the res put everything back together and left lever cable tied overnight. no change in res level after left overnight.

The main thing from reading those threads is I cant get fluid out the master cylinder with the lines disconnected which points at a ropey master cylinder but it all worked ok before changing the lines

Sid Squid 16-04-14 11:57 PM
Bleeding brakes won't bleed!
 
Firstly put the one man bleed thingy in the bin - they're more bother than help. Then do this:
1. Open bleed nipple on caliper, pull brake lever back to bar at modest speed - don't snap it.
2. Close nipple, wait a count of three then slowly release the lever.
3. Do that some more.

When the system is empty it can take some time for the ever-so-slight vacuum produced by the release of the lever to pull fluid through. When the system is full the resultant depression is significantly higher. The one man bleeder valves rely on completely air tight threads on the nipple or air will be drawn back into the system on master cylinder release, which loses you the vacuum when you're filling the system, and pulls air back into the fluid when it's full.

Ninthbike 17-04-14 06:22 AM
Re: Bleeding brakes won't bleed!
 
Quote:
Originally Posted by Sid Squid (Post 2948721)
Firstly put the one man bleed thingy in the bin - they're more bother than help. Then do this:
1. Open bleed nipple on caliper, pull brake lever back to bar at modest speed - don't snap it.
2. Close nipple, wait a count of three then slowly release the lever.
3. Do that some more.

When the system is empty it can take some time for the ever-so-slight vacuum produced by the release of the lever to pull fluid through. When the system is full the resultant depression is significantly higher. The one man bleeder valves rely on completely air tight threads on the nipple or air will be drawn back into the system on master cylinder release, which loses you the vacuum when you're filling the system, and pulls air back into the fluid when it's full.
Good point. First thing I did was to wrap nipple threads in PTFE tape. This stops any air/fluid from leaking past the threads. The method I used was much simpler. Fill syringe with clean fluid, attach to length of pipe (about a foot) and attach pipe to bleed nipple. Hold syringe upright and let pipe fill with fluid. Crack open the nipple and press in syringe to pump fluid through system into reservoir. Once the system is virtually full you can then push fluid back and forth using the syringe and/or master cylinder to remove all air. The pipe is clear so you can see any bubbles and just keep going back and forth until no bubbles come out. Fill the reservoir to the required level, tighten the bleed nipple and all done. My brakes are now working as they should. Good luck.

thefallenangel 20-04-14 10:01 AM
Re: Bleeding brakes won't bleed!
 
Hand bleeder 18 quid off ebay with nice case. Job takes minutes


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