road bike brakes

in Workshop
i bought a bike off the internet and the rear brake doesnt fully open and when i start to pull the lever it would just start to engage the brake a second or so after pulling because the first part just pulls in with no resistance not sure what to do antone know what is going on
0
Posts
could the impact this
this video shows the problem
If so the it’s the inner cable dragging, you could try lubricating it. But you probably need to replace it.
However it the caliper doesn’t spring back then you need ask someone else.
Ribble CGR SL 105
Canyon Lux CF 6.9 Pro
Triban 100
1. Undo the cable clamp bolt and free the cable from the caliper.
2. Squeeze the caliper together with your hand. Does it move freely, or stick as you release it? Try a few times. If it is closing and opening freely then the problem is not the caliper. If the caliper is sticking remove it and check for damage. Strip it and note the order of each component. Thoroughly clean all parts and reassemble with a tiny bit of lubricant on the moving parts. Ensure the caliper now closes and opens by hand freely.
3. Now, pull the cable through by hand to take up any slack. With the other hand operate the brake lever. Does it pull the cable smoothly? As you release the lever whilst pulling on the other end of the cable does the cable come back out at the caliper end freely? Again, do this a few times to check if their is resistance/ sticking. If there is, then it could be cable inner/ outer damage or a problem with the lever.
4. If point 3 results in resistance, start by removing the inner cable and fitting a new one. Try again. If this doesn’t sort the problem it may be your outer or the lever.
5. If the problem still isn’t sorted, check the outer, especially the location where it exits the shifter and any end caps that are fitted where it enters (if it enters) the frame and the caliper. Make sure the ends of the outer have been cut square, the hole that the inner threads through is not flattened or burred and any end caps fitted snugly. If any are found to be at fault and can’t be sorted, fit new outers.
6. Once you have the cable and lever operating properly and freely and the caliper is doing the same, refit the cable in the clamp bolt, pull the cable through whilst holding the caliper partly closed with one hand (so that the pads are a few mm away from the rim on each side) and clamp the cable. Operate the lever and pull it on hard a few times to take up any slack in end caps etc and then adjust to get the gap/ lever pull and bite point right. Ensure the pads touch the rim symmetrically and if needs be adjust to achieve this. Ensure the cable is clamped to the correct torque and then test on the flat with a run off area before going down hill at 40mph...
PP