Hello, I read about your problem and the answers they have given you, they are all right but there is one that you should take into account especially and it is about the irrigation that implies doing this type of repairs, I do not say that you do not do it yourself but to do it, I suggest you report well about the brake system, its operation and precautions that you must have when working with these elements, mainly with the brake fluid that is very harmful ... For yourself you will only save the labor costs, but not those of parts and spare parts since you must use the best quality ...
As for the work you should do, so that it is good, it is to disassemble the whole system and check each of its components (pump, pistons, cylinders and cannseries), which pump, pistons and cylinders you must verify that they are not chopped or with corrosion signs These damages change the element do not try to clean it with emery or sandpaper since this will damage them even more; The canyraries must work inner mind having the precaution of eliminating all solid material from the interior, avoid using compressed air to blow the cannons since if there is any solid object inside it will become a projectile driven by compressed air, being able to harm someone or yourself ... I hope it serves as alluda and not bored with my encyclopedia, luck