Dot.4 Fluid in Dot.3?
#2
DOT-4 and DOT-5 are compatible.
#8
DOT3 and DOT 4 cannot be mixed with DOT5 fluid. They are incompatible and if mixed, brake failure may occur. Moreover, there are serious compatibility issues when using DOT5 in a system that was engineered to use DOT3 or DOT4. Also, users should take care not to mix DOT3 and DOT4 fluids as there may be brake system compatibility issues. Always consult your owners manual and use the type of fluid specified for your vehicle
Last edited by grim_reaper; 02-18-2020 at 06:30 AM.