![]() Had I seen this study earlier though, I'd just get that AC Delco DOT 3 for the cars as we're not in the mountains, not towing heavy trailers, and not descending mountains That DOT 3 is the best of all of them for low temp operation of ABS and ECS. ![]() ![]() It's like 20 minutes with a Speedibleed while the car is up on the hoist for winter/summer tire/rim swaps. ![]() 2-3 years is the max I leave brake fluid without a flush now. Shelf life on the Bosch 5.1 is 5 years, and is a good deal from Rockauto. In any case, the study should relieve any reservations about putting 5.1 in a DOT 3 spec car, as long as you're maintaining a 3 year flush interval. I wish I could figure out if it is E or not. Adams, Bosch 5.1 could be candiate 5.1C or 5.1E. I do a full brake service at least once yearly on all our vehicles, so no seized calipers etc now in over a decade. Critic, ypw, I think the general rule from the brake fluid manufacturers of 2 years for a flush is not a bad idea. But this study clearly shows that for long flush intervals, DOT3 is likely best. Shane, on the DOT3 water absorption, yes, it's hard to find good data. In any case, I hope this dispels some anecdotal myths floating around, and prompts some intelligent discussion on the matter I have tried vacuum at the calipers and it always required a pressure bleed to get a solid pedal.so I don't use this method any longer. I'm using the Speedibleed pressure bleed system with correct caps for Honda, Nissan and Toyota.which works very well for a 1 person DIY setup with no two person pump/bleed required. This is what I'm standardising our vehicles to on a 2-3 year flush schedule. The DOT 5.1 E candidate may also be the BOSCH fluid, again just based on their spec of 680 mm2/s at -40C, compared to the measured results. I surmised that the DOT 5.1 C brand is the Bosch ES16-32N (DOT 5.1) based on its kinematic viscosity numbers at -40C. I've attached two links.the second gives you an idea of the brands uses, but the study does not explicitly say which is which. The ? Bosch ES16-32N showed the highest boiling point for wet (4%) fluid.The DOT 3 LV (I believe this is Dow Brake Fluid 372LB) shows the best viscosity at very low temps (of all the fluids tested), the least water uptake, and very low corrosion numbers.It looks like the DOT 5.1 will replace the silcone DOT 5 standard for the military.Corrosion results on the various fluids (other than 1 of the DOT 4 candidates) show excellent results on all the fluids.DOT 4 doesn't look so good in their tests.They test EPDM vs SBD rubber parts/seals for swell/hardness and my interpretation there is that it's a wash.This research confirms more or less confirms that DOT 3 absorbs less water than 4, and DOT 4 less again than 5.1.The study really clears up some ambiguous information floating around on the interwebs. I found some nicely detailed and recent (2019) data from a study conducted by the US military to evaluate DOT 3, 4, and 5.1 fluid as an ABS friendly alternative to DOT 5 (silcone based) which does not work with ABS systems. We also see winter temps that can dip below -35C, so choosing a fluid with very low viscosity at low temps makes sense. The one I'm most concerned about is our 2018 LEAF EV which calls for yearly fluid flushes, and has a very expensive integrated electronic braking system. I have been researching brake fluid for a bit now to determine if a switch from DOT 3 to DOT 5.1 makes any sense for our vehicles.
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