I currently have Sram guide brakes with hidden hoses and want to swap the calipers and levers to Magura. Can I leave the hoses in the frame and just attach the new ones or will I need to feed the new hoses through the frame? Is there a compatibility issues between the different fluids Sram & Mature use or is there a negative ‘re rotting seals etc..

Edit..

Oils are incompatable as would be the fittings at each end I’d imagine.

I just tape the end of the new hose to the end of the old one as I pull the old one out – pulls new one through and if you use decent tape no fluid leaks.