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Post by Fox on Feb 6, 2010 23:04:29 GMT -5
Today I had to replace a brake line on a 150cc 4 stroke. (1st time bleeding a scooter brake for me) The brake line replacement was easy but when I went to fill and bleed the system I squeezed the lever and opened/closed the bleed valve a hundred times and the fluid level in the reservoir never dropped so I was getting frustrated. I decided to remove the lever and push the plunger with my finger which made the plunger push in farther and that worked to get the fluid moving but it's hard on your finger so after staring at it for a few minutes it hit me: The lever was hitting the handle bar limiting the plunger travel! So I put the lever back on and then I slid the entire handle assy out to toward the end of the handle bar so the brake lever was hanging out in space and tried it. Voila! The lever wasn't limited in it's travel by the handle bar and the brake was bled in less than 5 minutes!  Hope this helps somebody.  |
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Post by stepthrutuner on Feb 7, 2010 9:58:25 GMT -5
Today I had to replace a brake line on a 150cc 4 stroke. (1st time bleeding a scooter brake for me) The brake line replacement was easy but when I went to fill and bleed the system I squeezed the lever and opened/closed the bleed valve a hundred times and the fluid level in the reservoir never dropped so I was getting frustrated. I decided to remove the lever and push the plunger with my finger which made the plunger push in farther and that worked to get the fluid moving but it's hard on your finger so after staring at it for a few minutes it hit me: The lever was hitting the handle bar limiting the plunger travel! So I put the lever back on and then I slid the entire handle assy out to toward the end of the handle bar so the brake lever was hanging out in space and tried it. Voila! The lever wasn't limited in it's travel by the handle bar and the brake was bled in less than 5 minutes! Hope this helps somebody. That's interesting. I was bleeding my Derbi brakes the other day and encountered a similar problem. Whatever works best for each individual situation is appropriate. What worked for me was making very, very small strokes (1/8 to 1/4 inch at the end of the the lever ball) to get the fluid moving while leaving the caliper bleed fitting open. I just kept making those tiny strokes until no more bubbles came out. In the past I have taken things apart as you did. This time I avoided that. |
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Post by Fox on Feb 7, 2010 10:38:57 GMT -5
I agree stepthru that it's always better to avoid taking anything apart if you can but since I had to replace the entire brake line due to a hole in it I already had the handle bar plastic off so it was no biggie to remove the throttle handle and slide the brake reservoir over to the right a few inches. The extra lever travel made all the difference.
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Post by Reign on Feb 7, 2010 14:58:52 GMT -5
IIRC, when I replaced the front end on my Triton, I did the same method as stepthru to bleed the brakes. Very small movements of the brake lever seemed to work better than giant movements. It took around 5 mins, maybe a little longer.
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Post by Fox on Feb 7, 2010 16:34:47 GMT -5
That means the Vento brake actuator assy obviously operates differently. Thanks for the tip! Should have put this in the 4 stroke section I guess. |
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