tuning an old bike Part 4:
Brake Repair broken piece. Final adjustment of brakes.
I already indicated how to regulate pads to act both at once, and correctly positioned on the rim and that further fine tuning was necessary to act on the adjustment screw located on one side ...
But about the setting: we see that by acting on the adjustment screw, do not notice any difference. Theoretically, the shoe should zoom in or out of the tire, but it is not.
So let's remove the brake arm in the screw to see what happens:
Remove the Allen screw that secures the arm to the sheath and immediately see the problem:
the plastic piece where the screw is housed regulator has cracked the side side. To be the broken area on the side opposite the visible, not what we appreciated . We study how the piece is assembled with a view to repair.
see that the outer reinforcement can put as much as we want, because it will not interfere. But inside we do need to avoid anything that stands out, as will in the spring.
cleaned the part with alcohol and increase the separation of the broken area by opening a bit with a toothpick. So we can even scrape inner edges of the broken area.
add some specific adhesive rigid plastic and keep it tight with a rubber band while the glue hardens. The gum comes better than a clip, for example, because it gives a uniform pressure.
Anyway, we will enhance the piece so it will not break again.
We are going to use a glue very strong and elastic, two component epoxy type and cover the piece out.
Next, let nylon thread winding tight, to stay in power and use force.
Finally, cover with another layer of glue and nylon thread.
As not available at the time of nylon thread, I used regular thread. Anyway, is impregnated with the glue and everything is made a part. We put layers of glue and wire to achieve a consistent reinforcement.
Actually a couple of layers to three, there will be more than enough and the result is more aesthetic than if we put too much.
After drying the piece, hardly going to break through this area.
It also could have done with fiberglass and resin, but for a piece so small it is not worth buying these products because they do not have.
At the time of installation, I see more you tighten or loosen the adjustment screw, the shoe is scraping away. So we will have to mount the brake spring by inserting the pin in another hole.
Incidentally, to mount the brake, I decided to insert in the brake arm of the repaired part and the spring (by inserting the end of it into the hole in the plastic part). And yet the whole mounted, we can put the item on your site inserting the spring pin of one of the three holes.
We have seen that has three positions or holes and is usually placed in the plant. In this case, we must place it in the bottom position, to pull the least ... As we have to remove the caliper away from the rim.
But if your out the opposite case, maybe we should loosen the twang that holds the cable to the brake arm to achieve we give the game enough to put the pivot of the spring in the hole.
But I say, in this case, was enough to put it in the lower pivot and no further adjustments needed, the two pads are perfectly aligned and do not rub.
And if properly symmetrical, we could always play a little screw. Now you act the part to be repaired.
I only have to review and adjust the transmission: chain, plates, sprockets and derailleurs. We will see in another post.
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