I've just replaced my brake and clutch fluid at 19,500 miles (15.5 months). It looked already due and brownish. Fluid coming out of clutch release (slave) cylinder was quite milky. There was a lot of white aluminum residue flushed out with the fluid. It started clearing up after running a few ounces through it. I'll be doing it again sometime next year when I get another bottle of DOT 5.1 brake fluid, which is a good upgrade over DOT 3 (and DOT 4). My clutch pedal was getting very stiff in sub-freezing temps with the original DOT 3.
DOT 5.1 is in fact specially designed for anti-locking brake systems (ABS): The viscosity (820 centipoises at -40°C / -40°F) lower than DOT 4 (up to 1800 cp) and DOT 3 (up to 1500 cp) brake fluids allows an easier fluid circulation in micro-valves of anti-locking systems. Perfectly neutral with seals used in braking systems. Anti-corrosion.
Mixable with DOT 3, DOT 4 and DOT 5.1 NON SILICONE BASE products. Do not mix with silicone (DOT 5 silicone base) or mineral base fluids (LHM). Store brake fluid in its original container, tightly closed to avoid absorption of moisture.
I used a 16oz bottle of MOTORCRAFT PM21 DOT 5.1 Brake Fluid for $11.06.
There's also WAGNER FC133301 Severe Duty DOT 5.1 in a 32oz bottle for $12.36.
https://www.rockauto.com/en/tools/brake+&+wheel+hub,fluid,brake+fluid,11389
DOT 5.1 is in fact specially designed for anti-locking brake systems (ABS): The viscosity (820 centipoises at -40°C / -40°F) lower than DOT 4 (up to 1800 cp) and DOT 3 (up to 1500 cp) brake fluids allows an easier fluid circulation in micro-valves of anti-locking systems. Perfectly neutral with seals used in braking systems. Anti-corrosion.
Mixable with DOT 3, DOT 4 and DOT 5.1 NON SILICONE BASE products. Do not mix with silicone (DOT 5 silicone base) or mineral base fluids (LHM). Store brake fluid in its original container, tightly closed to avoid absorption of moisture.
I used a 16oz bottle of MOTORCRAFT PM21 DOT 5.1 Brake Fluid for $11.06.
There's also WAGNER FC133301 Severe Duty DOT 5.1 in a 32oz bottle for $12.36.
https://www.rockauto.com/en/tools/brake+&+wheel+hub,fluid,brake+fluid,11389
