That said the engineers have a solution that involves replace a "redesign MC" that is capable of handle different fluids. Toyota legal department and PR group are doing their jobs and has more than implied the issue is from: adding aftermarket fluid(s). Never have I seen them dry out from fluids improper or not, nor has any of the Toyota or Lexus mechanics I known. I find this strange, I have personally seen seals: soften, swell and degrade causing fluid to darken, form improper fluids being added to the brake system. If the wrong kind of brake fluid is added, a rubber seal in the brake master cylinder can dry out and curl." regulators, Toyota said its brake fluids contain polymers that act as lubricants. Toyota's position has been very clear "In its filing with U.S. And that of the DOT 3 fluid that is currently at the Toyota parts counter.? ?.What I'm really after here is the chemical break down of Toyota brake fluid "DOT 3" which was used as a fill at the Toyota factory around 2001. And with the DOT 5 being a silicone based brake fluid, only recommend when factory installed. That, borate ester was added to DOT 4 and 5.1 to get these higher temp ratings. I understand the different temp fluid concept that Basically DOT 4 is higher temp rated than DOT 3 and so on, with some manufacture offering higher temp within each DOT rating. For one they call it DOT 3 (brake fluid at the parts counter today), but it has (reportedly) borate ester in it, which would make it a DOT 4 wouldn't it? As even Toyota has most likely changed it's formulation since 2001. I'm very happy with the way my old DOT 3 fluid (2001 factory fluid) worked, looked and the condition of the seals, which I'd like to maintain.īut I've now become concern that changing (flushing) with any fluid, even Toyota's, possible adverse effect on the seals. Because DOT 4 fluids contain a different chemical composition, the system may not necessarily react in a positive fashion to the borate esters floating around in the mix" Wet BP 3.7% H2O.284.311.356Ĭhemical Composition.Glycol Ether Based.Glycol Ether /Borate Ester.Silicone BasedĪs a trailing note on the DOT ratings, if your car was designed for a particular type of fluid (especially prior to the development of DOT 4 fluids), you should make every attempt to stick with that fluid! For example, if your car was delivered with DOT 3 fluid, the internal components of the system (seals, brake hoses, and fittings for example) were specifically designed and tested for compatibility with DOT 3. Interesting as StopTech indicates DOT 3 didn't have borate ester, Picked up a flyer on Toyota DOT 3 which states: "using a unique borate ester combination" Could brake fluid used after factory fill be a factor? Toyota/Lexus are shops, seeing and unusually high number of brake master failures. Toyota/Lexus shops no longer use their own brake fluid, they use bulk. Toyota no longer show who manufacture their brake fluid on the bottles. Don't top off Fluid or flush unless you must. SEE post # 18 in this thread for more info.Įdited: Toyota brake fluid that comes in vehicles made in Japan can not be imported into this Country, except in brake system. CCI Manufacturing :: Products :: Automotive Fluids :: Brake Fluid Hopefully someone can come up with the spec on the Toyota Brake fluid, I've tried and as of yet, have not found much. To boot, Toyota brand sit on the shelf gathering dust and moisture in a plastic can for $5.00 a pint. This is obviously not enough info to determine what brand, other than Toyota, is usable (equivalent). Looking at a can of Brake fluid at the Toyota Dealer, I found it read: Part # 00475 -1BF03 DOT 3 Polyakylene Glycol Ether. But I for one, wonder how many brake lines, MC or Caliper rebuilds or replacements are the result of incompatible brake fluid effecting the rubber adversely. This TSB is for a specific MC cup of specific models, other than the series 100. It goes onto say: " If replacement brake fluid is used that does not contain such polymers, or contain only small amounts, a part of the rubber seal (Brake Master Cylinder Cup) located at the rear of the brake master cylinder may become dry" Toyota states in a TSB, their Brake fluid: " Toyota uses brake fluids containing polymers that act as lubricants for certain brake system components. The FSM & Owners Manual recommends industry standard: SAE J1703 or FMVSS No 116 DOT 3. Does anybody know the: Composition & Information on Ingredients of Toyota brake fluids that was factory installed in 2001 or any year as well as what is on the Dealers shelf today?
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