An adapter system can be used on a walker having a walker tube attached to a walker telescoping tube. The adapter system has an attachment assembly that is configured to connect the adapter system to the walker telescoping tube. A bracket assembly is connected to the attachment assembly. The bracket assembly is configured in a first mode of operation to provide an armrest support above the walker telescoping tube and in a second mode of operation to be located away from the walker telescoping tube. A brake assembly is attached to a bracket assembly. The brake assembly is configured to enable movement of a brake adjustment screw to stop or slow movement of the walker and also act as a means of controlling the distance between the brake handle and the vertical hand handle.