Question : WHICH
brake fluid best suits my car, DOT 3 or Dot 4 ?
My braking system has ABS, EBD and BA.
The service manual says that both can be used.
However, I would like to know which one is more advantageous
in terms of braking efficiency ( hard braking conditions ), heat
tolerance and the general properties ( for example, viscosity,
lubrication quality on the brake pumps, ABS servos, etc )
The OEM service centre states that DOT 3 is preferred, but I
am not sure why since DOT 4 is supposedly a higher grade type
The differences between DOT 3 and DOT 4 are as follows :
|Dry boiling point ( min °C )
|Wet boiling point ( min °C )
|Cold viscosity at -40 C mm2/s
DOT 4 brake fluids are less sensitive to moisture in the
fluid and therefore in our climate would be a better choice to
Also, if one is doing a lot of hilly driving, the DOT 4
fluids have a higher boiling point and therefore less liable to