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Brakes not working

  • Thread starter Thread starter enelson2047
  • Start date Start date
E

enelson2047

Guest
overhauled my brake and front forks but now can't get the brakes to work. I have the Mityvac and they just want work or build pressure. What could be the problems?????????????????
 
If you have a dual front disc bike ( your signature doesnt provide a clue ) the manual says to start with the l;eft one first then the right. Also a little trick is to have someone gently start working the lever as you do the suction and cracking the bleeders below. That will help prime the master and get the fluids flowing.
 
It's just a ton of air in the lines. Keep working at it or use a syringe to pull the fluid through the lines.
 
Fill the reservoir, crack the bleeder and wait an hour or two. This may get it started.


You did bench bleed the master cylinder?
 
Been fighting the same thing since March. Have a MityVac too. Not a problem with the MityVac.

About to replace the caliper seals for the second time. Think there is a tiny air leak around the caliper piston. I've replaced the M/C with a newer one, replaced the line with a stainless steel line and bled bottles of fluid through the system.

Same old, same old. Got them to work well enough to ride some this summer, but the system wasn't right.

Good luck.
 
It MIGHT be an air leak round the bleeder valve on the caliper.
A little teflon tape would take care of that.
 
Could be an air leak around the banjo bolt washers too...you did use new washers???
 
I would start with purging the master cylinder. :-k

Remove the brake line from the M/C, cover the hole with your finger. (Have some rags handy to cover any spray that might come from around your finger, though.) Release a little bit of sealing pressure from your finger, squeeze the brake lever and hold it. Seal the outlet hole tight with your finger, release the brake lever. This will help suck fluid down into the bore of the M/C. Repeat the process, but note that there will now be fluid, so watch out for spray. When you think you have gotten most of the air out, put the brake line back on and continue with the Mity-Vac at the bleeder nipples on the calipers.

.
 
Always good to bench bleed first, as mentioned already, if you can.
If the master cyl. is purged of air then it is easier to bleed through the nipples.
I also use teflon tape on the threads.
 
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