Originally Posted By: artificialist
I once felt lighter brake effort in a Saturn ION by replacing the OE fluid with Valvoline DOT4. I found no air in the system. The only reason I could imagine one fluid would require more pedal effort than another is if the viscosity is different.
There is at least a slight 'compressibility' difference between the basic DOT 3/4 brands, and some of the very high end racing fluids claim a large difference (compared to other high end fluids) in this respect, so who knows?
I once felt lighter brake effort in a Saturn ION by replacing the OE fluid with Valvoline DOT4. I found no air in the system. The only reason I could imagine one fluid would require more pedal effort than another is if the viscosity is different.
There is at least a slight 'compressibility' difference between the basic DOT 3/4 brands, and some of the very high end racing fluids claim a large difference (compared to other high end fluids) in this respect, so who knows?
