If you wish to perform adjustments on your PGO T Rex 150 then it is usually recommended to have access to a Workshop Manual to keep just for reference in the event you want to know how you can take out a specific component such as the Brake Pads and fit it again in the right way.
PGO T Rex 150 Workshop Manuals will provide you with special diagnostic wisdom on your car so if something is faulty it helps you identify what the problem is and tips on how to fix it. Then you are able to assess if this can be achieved on your own or if the job is simply too big you could book your T Rex 150 in with a trusted repair garage.
PGO T Rex 150 manual