There are a number of other posters who hit the nail on the head. The problem is really with how we fund the courts. More volume needs to equate with proportional increase in resources.
That doesn't necessarily imply it isn't racist. There is such a thing as indirect discrimination. http://blog.oup.com/2015/07/indirect-discrimination-us-uk-la...:
"Indirect discrimination occurs when an apparently neutral rule or policy has a disproportionate and adverse impact on a protected group, and supposedly neutral policies become suspect unless they can be shown to be necessary for achieving legitimate goals. For example, prohibiting headgear (which would affect Sikhs), imposing a minimum height requirement (which could exclude women), or requiring a graduation degree (in a social context where a particular racial group has very few university graduates)."
In this case, one may wonder why courthouses in poorer neighborhoods aren't as well maintained as those in richer ones, and why, if the court is overloaded with cases, there aren't more judges applied to it. _If_ that's because of a rule "a courthouse per X citizens", one could argue that's indirect racism.
However, that same blog post seems to indicate that US law isn't that strong in making "disparate impact" illegal, if the impact isn't intentional.
Combined with some of these other accounts, that's more or less the definition of structural racism, isn't it?