| Author | Message | ||
     Sarodude |
I was helping a buddy get his Blast back together. It had been in a low speed low-side on the left. On the home stretch, we mounted the right hand controls on the handlebars. I went to squeeze the brake and noticed that it was mushy beyond belief. I figured that maybe we (uh, ME) hung the master improperly and maybe it exchanged some DOT4 for a gulp of air. Then I wondered just how far down a bubble could possibly go down a brake line. I started to squeeze the the front brake on and off. After a few seconds, the lever felt like it should and the front brake was operating normally. Clues? Did some minimal blob of air decide to surface as the fluid was being squeezed & un-squeezed? -Saro | ||
| Spiderman |
What happend is you probally compresed the piston in the caliper so you basicly had to "push it out" with the master cylinder. | ||
| Sarodude |
FWIW, The caliper was untouched. Plus, that usually takes one squeeze to push the pistons out. This was MULTIPLE hard squeezes SLOWLY restoring lever feel. The mushiness I had described developed after the bike sat with the master / lever / reservoir assembly hanging somewhat oddly for about a week. -Saro | ||
| Blake |
The master cylinder will self bleed. It does not pump fluid down to the caliper; it only compresses the fluid between master cylinder and caliper/pistons. The only actual circulation happens within the master cylinder itself (except of course when you bleed the system). If it ingests a little air it will self bleed. Cool eh? You might also want to check the front brake pads to see if they are wearing evenly. Rotating the pads (swapping left for right) each tire change can help to ensure even pad wear. |
