MegaSack DRAW - This year's winner is user - rgwb
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Hello,
I have Sram Code R's on my bike, they are about three years old and have been solid. Just done a pad replacement and bleed and the back is perfect but the front I just can't get it to work properly. By which I mean when the wheel is back in the lever pulls pretty close to the bar. I repeated the bleed a few times and with different size bleed blocks and get the same results.
The one thing that is consistent is when doing the draw and push on the lever end I get a lot of air (tiny bubbles)coming through. I have just used a brand new syringe kit so ruled those out.
I am thinking maybe a seal in the lever is knackered.
Any thoughts before I order a service kit for the lever??
Thanks
Yeah, I’ve always found that the lever reservoir needs to be pressurised a bit before taking the lever syringe, or else it tends to be underfilled.
It’s an arse though because inevitably dot fluid ends up everywhere.
If it’s lots of tiny bubbles then I’ve found that’s usually from the seal between screw and lever. Pulling too hard usually causes this. Assuming your caliper uses the bleeding edge tool, I’ve found it easier to disconnect the lever end first then nip up the bleed port screw and then do the caliper end. Push in a bit of extra pressure then close off the bleeding edge port. Once tight they don’t let any extra fluid pour out.
Are you degassing the fresh brake fluid before attaching the syringes to the system to bleed? I find that does make a difference.
Hello,
Yes degassing the fluid beforehand.
So when process suggested would be bleed as normal but leave the caliper syringe attached but closed. Do the lever draw and push, remove the lever syringe and put the screw in and then...
Open bleed edge port on the caliper.
Push fluid
Close bleeding edge port
Remove syringe
Job done??
I'd open bleed port and lightly depress so the bleed nipple was going into a full hole - you will get spillage but it means zero or absolute minimal amounts of air.
Before that, I'd close bleed port and then draw lever syringe up to help soon any air into lever syringe as well (I do that about 5 times).
So when process suggested would be bleed as normal but leave the caliper syringe attached but closed. Do the lever draw and push, remove the lever syringe and put the screw in and then…
Open bleed edge port on the caliper.
Push fluid
Close bleeding edge port
Remove syringe
Job done??<br /><br />
That’s been my process with bleeding edge calipers. Less mess when removing bleed kit from lever body and pretty consistent at given a firm lever. If you push too much fluid in it’s easy to loosen bleed screw again to release some pressure.
Having re-read all this, turns out the bit I say I do instead, I do before!
In bed with COVID and my step process is clearly too much for my brain.