XLC 500 Brake Bleeding

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XLC 500 Brake Bleeding

Postby TinyUK » Sat Mar 24, 2018 11:36 am

Hi
I have an XLC 500 and have recently replaced the levers as the originals were naff.
I have tried to bleed the brakes following the change as the reservoir is also new.
The problem I have now is the lever is spongy and when I press the foot brake and release it, the lever sinks travels to the throttle grip.
Can anyone tell me how to correctly bleed these brakes as I know there is a nipple in the centre front splitter and one on each caliper. I also know that the rear has a separate reservoir but seems to be linked to the fronts somehow.
I am really stumped on this one and getting frustrated as all I want to do is ride!
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Re: XLC 500 Brake Bleeding

Postby Dave Morris » Sat Mar 24, 2018 7:14 pm

When I change the fluid in my 500 XLC I start with the handle bar reservoir and bleed the air out of both of the front calipers. Then I moved to the rear reservoir above the foot brake and bleed the splitter unit before moving to the rear caliper. I then do all three calipers again but bled through from the foot brake reservoir. I’ve never had any problems.
Alternatively you could buy a vacuum bleeder and their pretty much guaranteed to pull any air out.
Just to re cap on the brake operation. The handle bar lever only operates the front brakes and the foot brake operates all of the brakes. It ticks the box for the MOT as dual circuit braking system.
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Re: XLC 500 Brake Bleeding

Postby TinyUK » Sat Mar 24, 2018 10:54 pm

Thank you for the detailed reply.
Is there a one way valve in the splitter unit? When bleeding all three calipers using the footbrake, will that the us fluid from the rear reservoir or from both?
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Re: XLC 500 Brake Bleeding

Postby Dave Morris » Sun Mar 25, 2018 8:19 am

It only takes fluid from the rear reservoir. It’s why I always bleed the handle bar first to clear any air down to the splitter unit and the front brake lines and then bleed from the rear reservoir but out through all three calipers but not forgetting the splitter bleed nipple along the way as I described.
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Re: XLC 500 Brake Bleeding

Postby Dave Morris » Sun Mar 25, 2018 8:22 am

I haven’t taken one apart but I think the splitter unit has a one way valve in it.
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Re: XLC 500 Brake Bleeding

Postby Robsearston » Sun Apr 01, 2018 5:39 pm

I did the same to mine and fitted cheap Chinese crap levers with new reservoir on front bled brakes over and over and still spongy in the end I refitted the old one and it bled up first time so it could be the design of the new lever/reservoir
Hope this helps


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Re: XLC 500 Brake Bleeding

Postby AntoneC » Sat Apr 07, 2018 7:53 am

You might be right, Rob. I have the same issue on the same model. I hope this is not the case though. I'm going to try a couple of things as well.
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Re: XLC 500 Brake Bleeding

Postby TinyUK » Mon Apr 09, 2018 3:06 pm

Got it sorted. Had to reverse bleed the brakes. Now the lever has the same feel as the one on my friends Kwak 1400.
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