Shimano BR-T4000 not mounting flush to brake bosses/studs
05-29-20, 01:29 AM
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Shimano BR-T4000 not mounting flush to brake bosses/studs
I have Shimano ST-EF50-L and ST-EF50-8R long pull shifter/brake levers. I had no name TX117 (promax?) linear pull alloys.
My brake bosses have a 5mm shoulder. The BR-T4000 have a 2-3mm space to accomodate that shoulder, so they are raised about 2-3mm from the frame. The spring pin engages less than half into the hole. Since it doesn't sit flush, there's a 5mm gap between the end of the boss stud and the mounting hole on the caliper.
After 2 days of research, I haven't found anything that gives a definitive answer/solution to this. Other posts say the BR-T4000 are supposed to do that as long as the pin is engaged. Also that they have integrated pivots whereas flush mounted ones use the bosses as pivots. I have no idea what's going on.
I was looking to buy Promax P-1 or Tektro 857AL.
P-1 is listed on ebay as short pull (listing error?), the official website says nothing about long/short. I thought short pulls were for cantilever/road calipers. Shouldn't all linear/v-brake be long pull?
The Tektro 857AL seems like it would work, but I don't know.
The more I read on this, the more unsure I become. Any help would be appreciated, thanks!
My brake bosses have a 5mm shoulder. The BR-T4000 have a 2-3mm space to accomodate that shoulder, so they are raised about 2-3mm from the frame. The spring pin engages less than half into the hole. Since it doesn't sit flush, there's a 5mm gap between the end of the boss stud and the mounting hole on the caliper.
After 2 days of research, I haven't found anything that gives a definitive answer/solution to this. Other posts say the BR-T4000 are supposed to do that as long as the pin is engaged. Also that they have integrated pivots whereas flush mounted ones use the bosses as pivots. I have no idea what's going on.
I was looking to buy Promax P-1 or Tektro 857AL.
P-1 is listed on ebay as short pull (listing error?), the official website says nothing about long/short. I thought short pulls were for cantilever/road calipers. Shouldn't all linear/v-brake be long pull?
The Tektro 857AL seems like it would work, but I don't know.
The more I read on this, the more unsure I become. Any help would be appreciated, thanks!
01-15-21, 06:55 PM
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I've just discovered the same problem. I suspect the only solution might be a couple of washers, but that's only going to work if the pin for the spring is sitting far enough into the hole.
I gave up for now. Did you find a solution Pantsu2x ?
I gave up for now. Did you find a solution Pantsu2x ?
01-15-21, 07:14 PM
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Yes, I bought Promax P-1's which fit my brake bosses flush. I was told the gap was okay, but I went with my gut for safety issues. I had been in an accident already, why risk brakes calipers failing or breaking off? Just looking at it seemed like a lot of stress was being put on the tip of the bosses.
Promax isn't the only company, I'm sure Tektro linears will work as well. As far as I can tell, if you're replacing Shimanos with Shimanos it will work because it seems like it is proprietary. Hope that helps.
Promax isn't the only company, I'm sure Tektro linears will work as well. As far as I can tell, if you're replacing Shimanos with Shimanos it will work because it seems like it is proprietary. Hope that helps.
