1996 Grand Caravan with ABS, 3.3L V6, 152k.
Am I correct that Dot 4 brake fluid is equivalent to Dot 3 - with the added advantage of higher boiling point? Is there any downside to using Dot 4, other than a small additional cost? Seems like the cost difference is irrelevant compared to the safety margin to reduce the chance of boiling the brake fluid on a long downhill in hot weather, or - as in a recent puzzler - heating from the exhaust system. Or is Dot 3 really just fine for most cars?
Either way, I’m going to flush the system with new fluid (and replace old parts as needed), it’s definitely due. Neither my owners manual, nor the factory service manual, gives a capacity for the entire system. Ditto the Napa store. I’m guessing it’s in the range of two quarts. I don’t want to buy a full gallon only to let it sit in the garage, but if I need three quarts, I may as well buy the gallon. Can anyone suggest either where to find the capacity, or have a ballpark approximation for what the system will need?
Also, is there any benefit to flushing the system BEFORE replacing wheel cylinders to keep old fluid out of new parts? That makes sense to me, even if it uses extra fluid.
#1: Dot 3 vs Dot 4
#3: which comes first: flush or new parts