Hey everybody, i have an issue while bleeding wich i just dont understand. In the step where i pull a vacuum at the lever side with the other side closed off i just get infinite amounts of air into the syringe, im using a brand new Sram Pro Dot V2 kit and i know the syringe isnt leaking air because if i just put a thumb over it it pulls a vacuum just fine. I attached a video just in case and i hope somebody can help me find a solution for this wich isnt just buying a new brake lever.
Thanks
Edit: They are Sram Code RSC brakes
by CuzImEdward_is_taken
14 Comments
Is the o-ring in place and intact?
I never suck, only push. Instructions may say different but I’ve always had the same issue. Poor seal and it pulls bubbles. 2 syringes, push back and forth.
There is an air leak somewhere, did you unhook the brake line at all? If so did you replace the thingamajob and red compression piece?
Air is leaking in at the bleed port. Do you have an o-ring installed if that is the instruction for that combo of kit + brake? Without ruining the port can you tighten the connection a tiny bit more?
IME you can pull air in with any kit if you put too much negative pressure on the system but yours seems excessive / like it is happening too easily.
I think the air is getting in from where the syringe connects to the caliper.
Thats an issue with the syringes and the fitting of the hose on the silver adapter. If you pull too hard you will pull air from outside. They have changed it in the new bleeding kits.
Perhaps a set of bb7s
If it’s the new purging kit, I recommend you go back to the previous steps. Check the lever adjustment screws, the hose fittings, and the condition of the hoses themselves. If the problem persists after that, I suggest submerging the caliper in water to check for oil leaks. Remember to use the blocks for the calipers
I had this issue as well brand new sram bleed kit. Come to find out half the threads on the bleed port of my lever were missing. A big chunk just gone. If its not that… then its either there is a leak in one of the connections, or one of the seals is toast and they need a complete rebuild. These are notorious for having bladder and piston seal issues. Id check all the syringe hoses first and make sure they are tight and not damaged. The plunger seals on the syringes are definitely strong enough to withstand vacuum so do listen to these guys. I always used vacuum to bleed my RSCs before I switched to Mavens and always got a perfect bleed every time. I bet these guys would also tell you to put dot fluid on the piston seals when doing a piston massage too. Instant warranty void.
0p 0lp 0ppp0pl]0pp]ppp]0p]pp00pp000pp0pp⁰00 0 0pp ppp0000p00p090p90p09p909000p9p0090p900p9900p9p9p0090009p00000p9ppp0p900p0p0p09p00p900p99p0p0090p0p09pppp00909999000p090909000polp00lpplll0lppll0ll0p0090099p99099999p99999990999p99⁹⁹p099999999pp999pp99p999999p9⁹9p99p9p9090p 000lpp lpp 0p0p lp00pl0p0 pplp0ppp0 000pl0 00p0lpp0l00l0ppl 0pplpl0p0pp0pp0p0 lp0l0p0 l0pll0llplp0lpl0ll0 pllpp 00999999099999⁹009p00plpppl0 lp
Check the o-ring on the syringe tips. If there’s not on in the recess, there should be.
if that happens go back to the two syringe and tilt the bike, so the caliper is at the bottom. It also helps to try to push all the air out in the syringe as possilble before you attach it to the lever and caliper.
Try just pushing. We’ve tried pulling on a few systems and very rarely seems to work well. If there is air in the line, you’ll get it pushing.
You could also try closing up the entire system, tilt the bike up so the reservoir is definitely the highest point, squeeze the brake lever, and tape it squeezed down overnight. In the morning you will have a bunch of air in the reservoir. I did this twice on my buddies brakes that we were getting unlimited bubbles with lightly pulling and they are fantastic now.
Had this issue and it ended up being one of the o rings on the banjos.