Yes, absolutely.
Adopters are only needed in so far as different OEM brands use different diameter and thread pitch caps on the brake fluid reservoirs. I have two that have served my full portfolio of changing car brands over the past 20+ years: one for BMWs, and another one for GM/Tesla vehicles. Honda/Acura and Toyota/Lexus are covered by one adopter or the other (I keep forgetting which one).
I forgot how much I paid for the brake fluid pressure bleeder as I got mine more than 20 years ago. I think it was around $60, and maybe another $15 for the second cap.
Easily one of the best ROI tool investments I've ever made!
Along with a jack, set of jack stands, set of metric sockets, and a torque wrench.
Brake fluid is
hygroscopic, and naturally absorbs moisture over time through brake lines and brake reservoir breather hole. That presents two problems:
1). Water in your brake lines tends to settle at the lowest points, and those are calipers and ABS pump. Over time, those start rusting. In case of calipers, they start sticking and will need a rebuild. In case of ABS pump, you will be buying a new one.
2). If you brake hard enough to raise brake fluid temperature level about 100F (calipers heat first, where water is collecting!), water will boil and turn to vapor, which is highly compressible. Then your brake pedal hits the floor without slowing the car down, your pants turn brown, and you revert to impact braking.
Not exactly.
All brake fluids have a Dry boiling point (BP) and a Wet boiling point (3.7% water contamination) disclosed by the fluid manufacturer. The speed of degradation is very dependent on what fluid you start with, and your ambient humidity.
If you start with a high-quality DOT 4 fluid like
Motul RBF600, your Dry BP = 617F and wet BP = 400F.
If you start with cheap-o DOT 3 brake fluid, your Dry BP = 400F and wet BP = 284F.
So even with prolonged service and water contamination, high-end fluid will outperform cheap fluid in terms of resistance to brake fade.
However, the rusting from water contamination will be a problem with both fluids.
How much rust do you want in your calipers? In the ABS pump?
What fluid did you start with?
In the end, it all depends on how much you care about your stopping distances & safety vs. saving a few bucks on maintenance.
HTH,
a