| Author | Message | ||
     Impala |
So my front brake on my X1 is dragging and unridable. Brand new master cylinder, pads and caliper rebuild kit. Caliper was rebuilt because of the dragging and it did not fix the problem Lever starts out a little soft and gets progressively harder. After 5 or so miles the front brake starts dragging bad. I checked the floating rotor pins today and they were not the problem. The only thing I haven't checked in the rotor but I don't think it is warped | ||
| Hootowl |
Are you using the stock lever? | ||
| Impala |
No I have aftermarket levers. Maybe I should put the stock one on? Is there an issue with levers? | ||
| Ratbuell |
there can be if they aren't machined properly... | ||
| Impala |
It makes sense. A little constant pressure would not allow fluid to flow back to the master causing my pressure build up. Hmmmmmm. | ||
| Trojan |
No I have aftermarket levers. Maybe I should put the stock one on? Is there an issue with levers? Brake lever for the tube frame bikes are different than the XB models (and different from the early S1 too). The levers look almost identical to the eye but the wrong one will cause the front brakde to lock solid eventually as it does not allow the master cylinder piston to fully return. Every time you apply the brake you are increasing the pressure until it eventually locks! Put the original lever back on and it should solve it. 'Reputable' aftermarket lever manufacturers will specify different levers for different models. If you buy from ebay then buyer beware  | ||
| Jolly |
At what point did the brake levers become standardized for the tube frame models. Was it at the point that the S1 switched to front Nissin calipers? So a 96 s1 would be different than a 98 s1 but a 98 s1 would be the same as all the 98 and up tubers? (I dont know what a 97 has for a front caliper, same as 96 or same as 98?) I use ASV levers on all my 98 and up tubeframe bikes and was going to purchase a set for my 96 S1. ASV levers web page doesn't list different levers for a 96 from a 97 or a 98 and I consider ASV to be a reputable company for levers. I hope this question helps with the topic instead of creates a "high-jack" scenario.... (Message edited by Jolly on May 29, 2014) | ||
| Willyboy386 |
You need to look inside the master cylinder. There is a small hole in there that is responsible for allowing a certain amount of fluid to bounce back into the reservoir. If this is blocked it will cause the automatic system designed to move the pads out due to wear to seize up. Can be determined by pulling lever while cap is off, a small spout of fluid should be present when pressing lever. This or if the pistons and/or quad seals at the piston are jacked so would pop those out and inspect too. Are looking for scoring, foreign debri, and corrosion. But so far leads are pointing to master... | ||
| Thylacine |
Crimped line, or bulging . Check that also, you seem to have replaced everything else. | ||
| Trojan |
At what point did the brake levers become standardized for the tube frame models. Was it at the point that the S1 switched to front Nissin calipers? So a 96 s1 would be different than a 98 s1 but a 98 s1 would be the same as all the 98 and up tubers? (I dont know what a 97 has for a front caliper, same as 96 or same as 98?) 96 S1 models had Performance Machine callipers and 97 on had Nissins (The PM callipers had a 'horse' logo and the later ones had 'Buell' written on them. I am not sure if the 96 models can use the same lever as the later ones though as I've never tried it (I changed the whole master cylinder on our early S1). All the rubers are the same from 98 on wards though, and the 1125 (and ZTL2 fitted XB models) shares the same brake lever as the 98 model tube framers for some reason, rather than the XB models  | ||
| Jolly |
So 96 was the only year the S1 carried the PM caliper..... Wasn't sure if it went to 97 or not..... Is there any chance you have the incorrect master for your caliper? I've not experienced this problem personally but could the incorrect piston size on a master cylinder from a 96 bike paired with a caliper from a 98 and on cause problems? Don't the PM and the Nissin calipers have different size piston bores which require a properly matched piston in the master? Long shot I suppose but it might be worth looking into since you've checked everything else? The only reason I bring this up is that I was recently going to change my master cylinder and did some research and heard of folks having front brakes lock up due to incorrectly matched piston bores in master cylinder to caliper... | ||
| 1313 |
So 96 was the only year the S1 carried the PM caliper..... Wasn't sure if it went to 97 or not..... 1997 also had the PM front caliper. The switch to Nissin happened in 1998 (as Buellish once reminded me), 1313 | ||
| Impala |
It was the lever. Swapped it out this morning and rode 30 miles with no issue. Stupid Ebay levers! Thanks everyone as usual. |
