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It looks like you're missing some <arg> tags above your <node> tag. Try this:

<launch>
<!-- name is the name of the variable, default is the default value if no value is specified -->
<arg name="vel_cmd_topic" default="default_topic"/>
<arg name="max_speed" default="a.bc"/>
<node pkg="move_base" type="move_base" respawn="false" name="move_base" output="screen">
    <rosparam file="$(find car_navigation)/param/teb_local_planner_params.yaml" command="load" />

    <!-- Here are the params shared by several nodes -->
    <rosparam file="$(find car_bringup)/param/common_params.yaml" command="load" />

    <!-- Here is getting the parameter from the previous file and working properly-->
    <param name="x_size"            value="$(arg x_size)" />

    <!-- Here I am having the problem when remapping -->
    <remap from="cmd_vel"           to="$(arg vel_cmd_topic)"/>
    <remap from="max_speed"         to="$(arg max_speed)"/>
</node>
</launch>

From the terminal, type:

roslaunch package_name launch_file_name.launch vel_cmd_topic:=topic_name max_speed:=x.yz

and replace these placeholders with your own values. I've never done this with <remap> tags, but I don't see why it wouldn't work.