Hydraulic Cable Brakes

[saneagle]

What's the make of the brakes? Are they cable (as in a normal brake cable) activated hydraulic disk brakes?
When you buy disk brakes they should come with a plastic shim that fits between the pistons This stops the pistons closing together when doing maintenance.
If the reservoir has a certain amount of oil in it when bought then I would not go by over that amount
If it cable activated then use the barrel adjuster to put more tension on the cable, this will bring the cable attachments closer together on the caliper resulting in the brake lever not requiring so much of a squeeze .

ZOOM XTECH HB100 MTB Hydraulic Disc Calipers Front and Rear Rotor G3 160/180MM MT200 M315 160mm Rotor Hydraulic Brakes for Bikes - AliExpress 18

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The diameter of the pad pistons is about 20mm and the diameter of the actuator piston is about 10mm, which means the ratio of linear movement would be 400:100, but there are two pad pistons, so if the pads wear 1mm, the actuator piston has to move an extra 8mm. If you look at the picture in the listing, then imagine those bellows being 8mm shorter, you can see the problem.

 

[Raboa]

The cable pull on the brakes activates the fluid reservoir system which then pushes against the pistons.
The advantage of this is that it gives you a similar feeling to a full hydraulic system but without so much of the complications of a full system.
If you are not using all of the pads then you do not have enough tension in the brake cable to activate the full capacity of the fluid reservoir.
Adjust the cable tension like you would a v brake, under or overfilling the reservoir system will have a negative effect.
On the caliper body it has a barrel adjuster, your brake lever should have one as well.

 

[saneagle]

The cable pull on the brakes activates the fluid reservoir system which then pushes against the pistons.
The advantage of this is that it gives you a similar feeling to a full hydraulic system but without so much of the complications of a full system.
If you are not using all of the pads then you do not have enough tension in the brake cable to activate the full capacity of the fluid reservoir.
Adjust the cable tension like you would a v brake, under or overfilling the reservoir system will have a negative effect.
On the caliper body it has a barrel adjuster, your brake lever should have one as well.

There is no reservoir. That's the problem. It's a closed system witha fixed volume of fluid.