Today I started my first RBR Project (bevore I just did some GTR2 Projects). I created 2 roads. One of them Asphalt, and one of them Gravel. After assigning the textures to the roads I decteted, that on all the materials in the XPack "roada" is set as the racer-surface. So I changed the Surface to "gravel" (and the rfactor name to "grvl") within BTB (not Xpacker) and exported the Project. But all I got is Asphalt-Surface. The textures are looking good. But when I brake hard I do hear that squeeky noise when youre braking on tarmac. It even feels like tarmac all the way. What am I doing wrong? Has someone an idea?