niu N-GT, Service Manual

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V1.0.0 50
Failure diagnosis
The brake performance is not good.
The brake is not adjusted properly.
The brake pad and brake disc are worn.
The brake assembly is not installed properly.
The brake pad and brake disc are contaminated.
The brake responds slowly or the handle is tight.
The brake is not adjusted properly.
The brake pad and brake disc are worn.
The brake assembly is not installed properly.
There is an abnormal noise from the brake.
The brake pad and brake disc are worn.
The brake pad and brake disc are contaminated.
The brake handle is softened without an effective application.
There is air in the hydraulic system.
There is leakage from the hydraulic system.
The brake pad is worn.
The brake caliper piston seal is worn.
The main cylinder piston cup is worn.
The brake caliper is dirty.
The main cylinder is dirty.
The brake caliper does not slide smoothly.
The brake liquid level is low.
The flow channel is blocked.
The brake pad is bent and deformed.
Disassembling
Replace the brake pad assembly.
If the brake pad assembly will be used again, then it should be marked at side before removal
so that it can be installed at its original position.
Remove the following assemblies from the handle and shock absorber.
Front/Rear brake:
1. Oil pump body assembly
2. Front/Rear brake disc
3. Brake cylinder assembly
4. Brake pad assembly
5. Brake hose assembly
6. Hydraulic brake handle
There should be no oil stains on the Front/Rear hydraulic brake pad assembly in installing or removal.
The cleaning should be made with a specified detergent to avoid reduction of the brake performance.
Loosen tightening bolts on the brake cylinder assembly.
Remove the brake cylinder assembly from the front shock absorber.
Remove the front axle, and remove the front wheel.
Remove the brake disc from the Front/Rear wheel.