Working on a 2017 GK110 TaoTao go kart. The master cylinder does not pump fluid to the rear brake so I took it off. Very rusty looking and if both sides are suppose to spring back and forth only one does. I am looking for a new one but I do not see a replacement with the same design. This one has the right side brake line to front opposite the brake light switch but those online do not. Does it matter?