So I’ve had a Big wheel stomp z3-140 and after riding it in the track one day I noticed that my brakes were a bit squishy and wasn’t fully braking properly anyway I get home and realise that they aren’t working at all and there is no pressure when I press it so I thought it was brake fluid and so I’ve looked up how to do it but it’s got a bit better but not fully they still don’t have any pressure especially the back brake. Any suggestions would be very appreciated thanks.