1. No brake fluid in the master cylinder.
2. The master cup is damaged or treaded.
3. The pump cup is damaged or treaded.
4. The brake pipe is seriously broken or the joint is disconnected.
Failure to brake failure should be immediately checked. First observe whether the leakage of brake fluid. Such as brake master cylinder putter dust cover brake fluid leakage serious, mostly belong to the master pump bowl tread or serious damage. Such as a wheel brake drum edge of a large number of brake fluid, indicating the rotation
Pump bowl pressure or serious damage. Pipeline leakage brake fluid is generally visible. If there is no leakage of brake fluid phenomenon, you should check the total pump liquid chamber brake fluid is sufficient.