Slugs should be unique for each content type as they are a unique identifier of the content on the url side. To overcome this limitation you can simply create two costume taxonomies one for wheels and one for brakes and have a mercedes in both of them.
Keep wordpress from modifying my permalinks
Remove Page Slug from URL
taxonomy term in URL slug won’t forward to the correct term for custom post like it does for default categories/normal posts
custom post type archive slug vs. custom page template
Uppercase vs. Lowercase page slugs
Blog post URL redirects to a Page URL who’s slug is a prefix of the post slug.
How to change comment-page-1#comment-25 to any string?
Show only one of the categories of a post in the breadcrumb?
Change order custom taxonomy