Originally Posted by
Iride01
You might be surprised that a lot of disc brakes on cars only have one piston.
While your cable pulled single piston brakes might not stop as well as others, I bet they stop well enough. Or perhaps you simply need to get them adjusted. But don't expect them to stop as well as better brakes.
On a modern car, as the piston pushes the pad to the disc, the caliper floats moving the non piston side pad towards it also.
I don't know if that is the case on the OP's bike.