Rear ABS and Parking Brake light

Hello, I have a problem with my car, it is an Isuzu Trooper 1996 and on the board I have the Ambar Abs Ambar and that of the brake parking on there are times that they go out what tells me that it is an intermittent failure or at least that is what I think, someone who has the schematic diagram or better even if I have the solution to my problem !!! Thank you!!

Change or fill in the brake fluid ... Check pills ...

If low light is lit

greetings.

It is true Czech first level of brake fluid and then pills and leaflets, it is the start.