there is an issue with the rear brakes when you run anything other then "rear disk brakes" can you fix this? the stock disk brakes don't allow you to run any other wheel and tire combos on the vehicle
It just sounds like that. If you really want to change the sounds, go look for some tutorials. You'll need a lot of patience too.
A meshslap is a vehicle that has a jbeam (physics) of one shape, usually "borrowed" from an official car or good mod, and a mesh (or appearance) of a different car. They're supposedly easy mods, but are almost always low quality due to the jbeam and mesh not matching at all.
Are you wondering what I have done and added? I fixed the mapping conflict of the PBR; I fixed two materials because they had strange textures; added the info for the configuration because without it the car was loaded in game with a white color and without some parts with the PBR and added a new thumbnails. I highly recommend cleaning the cache before installing it to avoid problems. The credits for the PBR go to ESkim.