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Rear brake bleeding problem, ? Rear brake bleeding problem, ?
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 11 May 2009
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Rear brake bleeding problem, ?
Hi, I am bleeding the brakes on my XTZ660 and am having a problem with the rear brake, the front bled fine.
Firstly i should say the rear brake has been siting for a few months removed from the bike with caliper end hose disconnected. (I have been rebuilding the bike and had to disconnect the hose to remove it from the swingarm).

Ok so the problem is, i have it all back together and on the bike, I've re-filled the reservoir, hose it connected to the nipple on caliper.
I start pumping and cannot get any pressure build up, the pedal will press after press go straight to the bottom, and the fluid in the reservoir does not lower, whats the problem?

There are no leaks
There are no blockages in the hose from the reservoir to the master cylinder.
The rear brake was working fine before i took it off.

What do you think?

thanks
Brad
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Old 11 May 2009
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If you get fed up I can get you all the bits to convert to drum at the back

You'll NEVER have to bleed it again!!!
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Old 11 May 2009
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you could get in contact with Kev off the www.xt660.com web site.
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Old 11 May 2009
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On the reservoir check to see if it has a rubber dish, this has to be removed, seems obvious but I missed it as it looks like part of the reservoir and I was pouring fluid into the rubber.
I was doing the brakes on my TTR and could not figure out why the fluid was not going down.
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Old 11 May 2009
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you need to bleed the master first at the banjo bolt on the master, then bleed the hose to the banjo on the caliper then you should be able to bleed it normally
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Old 11 May 2009
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I've never had a problem bleeding the brakes on a bike, but if it was a car I would say that a seal has gone in the master cylinder. If it's been left dry for a while, perhaps the seals have perished.
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Old 11 May 2009
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hi there ive had this problem in the past when the hose is disconected , the first thing to do is make sure the bleed nipple is not blocked ,it can happen . the main problem i think you have is there is no fluid in the hose to build up pressure what you can try is to get 2 hose clamps ,sqweeze 1 clamp as close to the outlet from the master cylinder , slave cylinder the other 1 a few inchs down the line, plyers and a rag will do if you have no clamps. pump the pedel if all go,s well you will get resistance on the pedel if so take the first clamp off and keep pumping, the fluid should now reach the second clamp , keep putting the clamps on until you are at the caliper and the hose is full ,then bleed as normal. oh by the way if you have goodridge this will not work ,if you have try unbolting the hose from the caliper put the hose in a jar of fluid and pump away this may bleed the hose enough ,then reconect . if you can borrow a syfone gadget that conects to the bleed nipple even better. just keep at it and you will get it to go. good luck zigzag
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Old 11 May 2009
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zigzag if your still using rubber hoses and they are over 5yrs old bin them and fit braided lines
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Old 11 May 2009
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Bleenin!
Zigzags technique is a good trick and works well on standard rubber hoses. Steel braided can be damaged though.
Be carefull to pad out the jaws if using pliers (long nose pliers with insulstion tape padded jaws work well).
You could also try back filling the line from the slave cyl (caliper) bleed nipple.
There are specific pumps you can buy for this but a large syringe does it well.
Once the line is full is should bleed ok.
Dave.
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