Observe the vehicle manufacturer's change intervals. After thousands of units sold and no problems reported perhaps Shimano could be accused of exaggerating slightly - but that's just my view. These substances can be broken down into four key components: DOT brake fluid is required to meet strict standards and specifications set out by the Society of Automotive Engineers and the Department of Transportation (DOT) - hence the name. Here's what Shimano have to say: It's a convincing argument.   Your link has been automatically embedded. Both seals were cleaned using hot water and Marine Clean, which is a sort of super-Windex sold by the people who sell POR-15. As it is one-of-a-kind, there's no competition (as such) and the warranty says you should use it, they can basically charge what they like for it - and they do. Due to its hydrophobic properties it has a very long life-span meaning low maintenance and fewer fluid changes. DAMIK--. We have sold thousands and thousands of units worldwide and never had any problems reported. By now you will appreciate that there is more to the great brake fluid debate than simply discussing boiling temperatures.Which ultimately leaves only one question - which one is best?Well, why don't you tell us? DOT 3, 4 and 5.1 fluids are hygroscopic (water absorbing) glycol based fluids. Whereas the Wet Boiling Point is defined as the temperature DOT brake fluid will begin to boil after it has absorbed 3.7% water by volume. JavaScript is disabled. Aside from bleeding technique, anything different in how they actually work, any specific tricks to make them run well? It's not possible to change the seals in a Magura slave cylinder, so I'll have to change the seals in the master cylinder. Then of course, there's the issue of what mineral oil really is. There's good news and bad news when it comes to its water-absorbing properties, that is why you'll find I have entered it in both tables to show both sides of the story. Even LHM+ outweighs Royal Blood with a fluid that has a 107% higher boiling temperature. The likes of Shimano and Magura have no doubt spent a lot of time and money refining their proprietary Mineral Oil brake fluids so you can understand why there is a degree of secrecy on the subject.But is the lack of a governing 'rule book' for Mineral Oil bad thing? The reasons behind this low temperature is unknown, all we know is that Magura Royal Blood is based on Castrol Vitamol V10 hydraulic fluid.All of these figures have been provided by the manufacturers themselves. SO you have all of the above, i cant seem to find out what the difference is between them... As in what advantages each would have over the other. KTM's will use either DOT 4 or Mineral oil. Having spilled it all over every bike i've owned since 1998 i've never experienced any damage to the paint (or thermoplastic in the case of my Lobo). Find out more about legal matters and data protection here. Personally, I use DOT simply because I like Hope brakes. Take a look at the table below. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. It is also kinder to paintwork unlike corrosive glycol-ether based DOT fluids.A good example of its use is in military vehicles which can be stored for long periods of time but need to be ready to be used at a moments notice. Bractec master cylinders that use mineral oil have a green cap. As we've learnt, water mixed with DOT fluid has an adverse effect on the brake fluid by reducing its boiling temperature and therefore reducing its performance. just curious, but i always read that DOT fluid can 'ruin your paint.' Let's start with DOT fluid and remember that the points below apply to glycol-based DOT fluids only, we're excluding silicone DOT 5 as it is not used in any hydraulic cycle brakes that we know to. You are correct that KTM uses both types. Seals MUST be compatable with the fluid-period! I have a Magura slave cylinder for the clutch, be Magura say you can ONLY use mineral oil, Dot 4 will destroy the seals. Using mineral oil in a DOT brake system is almost as bad as using DOT fluid in a mineral oil system. As you can see, there are a lot of positive points about DOT brake fluid, not least the fact that it can be found pretty much anywhere at less than half the price of Mineral Oil. All the bikes I've had with hydraulic clutches would just leak on the ground if the slave cylinder failed. May damage paints, varnishes and some plastics. True Norcal, not that Bay Area/Sacto Crap... (You must log in or sign up to reply here. Don't blemish that bling now! Tietoja laitteestasi ja internet-yhteydestä IP-osoitteesi mukaan lukien, Selaaminen ja hakutoiminnot Verizon Media -verkkosivustojen ja -sovellusten käytön aikana. DOT 4 and DOT 5.1 are both glycol-based brake fluids and are used widely in the automotive and cycle industry. As soon as this air tight seal is broken it will start absorbing moisture from the environment and the boiling point will begin to drop.Castrol recommends that DOT fluid in previously opened containers should be discarded after 12 months. Is a dimension for consistency (solidity or fluidity) of a substance. Trials Central This refers to the temperature where the brake fluid will start to boil or vapourise inside the brake system. Purple in colour and sometimes referred to as 'synthetic brake fluid', DOT 5 is not compatible with any of the glycol-ether based DOT fluids that we've been focusing our attention on so far.Although tests have been carried out by the various hydraulic mountain bike brake manufacturers, DOT 5 has so far not proven itself to be a better alternative to glycol-ether based fluids used in hydraulic mountain bike brakes today.It is also more compressible than the other DOT brake fluids which can lead to a sluggish or spongy brake lever (or pedal) feel, and therefore requires special design considerations when used in brake systems.Furthermore DOT 5 is hydrophobic and does not absorb water from the atmosphere like regular DOT brake fluid will. These fluids absorb water at a rate of 2-3% per year.   Your previous content has been restored. Having spilled it all over every bike i've owned since 1998 i've never experienced any damage to the paint . By using this website you agree to this. There are two types of brake fluid used in hydraulic mountain bike brakes today: Certainly the most commonly used brake fluid in use today, due to its wide use in the automotive industry, is DOT fluid. I have been using brakes with DOT since I started riding but am switching to Shimanos for the year which use Mineral Oil. DOT Brake Fluid vs. BRAKE FLUID DOT 4 is ideal for hydraulic disc brakes and drum brakes on motorcycles, cars, commercial vehicles and machines. However he went on to state, with 'absolute certainty', that 'Magura fluid will destroy Shimano brakes in a very short amount of time. I see some information on here about how bad it is to use DOT4 brake fluid in the clutch system instead of the Vitamol V10 mineral oil, and that it will destroy the seals. × Fluid manufacturers can and do improve on these temperatures with some brake fluids reaching dry boiling temperatures well in excess of 300°C/572°F. Glycol based fluids are hygroscopic which means they absorb water/moisture from the environment at normal atmospheric pressures at a rate of 2-3% per year. Yes, we were surprised too! lick the DOT off your fingers and you can get sick, lick the mineral oil off and you just poop. In the case of lubricating greases, it is the amount by which a cone with specified dimensions penetrates vertically into the specimen to be examined under specified conditions. Paste as plain text instead, × Magura Royal Blood Mineral Oil has a ridiculously low boiling temperature when compared with its rivals in the industry. I say 'probably' as it depends on the service life of the older fluid but you get the idea - not a great deal can go wrong mixing glycol-based DOT fluids.Silicone DOT 5, as we mentioned earlier, is not compatible with any of the other DOT fluids, nor is it able to be mixed with Mineral Oil brake fluid. BRAKE FLUID DOT 4 is a state-of-the-art, high-performance, premium brake fluid of outstanding quality, with a high wet boiling point and thus extreme safety reserve against vapour lock. Will mineral oil cause any problems with the Braktec clutch master cylinder seals (I'm assuming it won't as it doesn't contain any acids, unlike Dot 4). To participate, make sure you send your email by November 29th. So just which brake fluids can you mix without causing harm to your brake system? As you can see, there are a lot of positive points about DOT brake fluid, not least the fact that it can be found pretty much anywhere at less than half the price of Mineral Oil. Keep in mind that brakes specifically designed for Dot cannot use Mineral oil and visa versa. We don't have to trust anyone else's testing standards for the fluid they make. Click here for details and to learn how to participate. I've owned a few bikes with hydraulic clutches, and they all just use brake fluid. Are Shimano simply trying to put the frighteners on people so they use nothing but Shimano's own branded Mineral Oil?