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After castor oil-based brake fluids came Glycol-based fluids which fall under the DOT 3, 4, and 5.1 standards. Following these Glycol-based fluids came Silicone-based fluids which generally fall under the DOT 5 standards, although they are not as widely used as the Glycol based brake fluids. When you are riding at speed you want to be sure that your brakes aren’t going to let you down and that a braking failure isn’t the penultimate experience of your life. The Society of Automotive Engineers (SAE) classifies another three grades: SAE J1703, SAE J1704 and SAE J1705. There are three essential measures used to set a fluid’s final DOT rating that consumers should be aware of: Online Browsing Platform ISO 4925:2020 - Road vehicles -- Specification of non-petroleum-base brake fluids for hydraulic systems". www.iso.org.
DOT 4 brake fluid when DOT 4+ is recommended? Can I use DOT 4 brake fluid when DOT 4+ is recommended?
Viscosity of Automotive brake fluid – viscosity table and viscosity chart:: Anton Paar Wiki". Anton Paar . Retrieved 2018-07-06. In NA you can find though DOT5.1 at most autoparts stores, just google the most common ones or ask them over the phone. Also motor bikes carry those, as they are very suitable for extreme conditions. Brands to ask for: MOTUL DOT5.1, Halfords Brake Fluid DOT5.1, Raleigh Motorex Brake fluid dot5.1, SINOPEC DOT5.1 Synthetic Brake Fluid, Chrysler 5.001 000 989 08 107 11 [at Chrysler dealership], Brake fluid LUCAS DOT5.1, AVID PITSTOP HYDRAULIC DISC BRAKE FLUID DOT 5.1, AP Racing Formula Brake Fluid DOT 5.1, and so on. Me personally I went with MOTUL DOT5.1. Regular DOT 4 has a minimum Wet Boiling Point of 165 degrees celsius, while the DOT 4+ spec is 180 degrees. DOT 5 brake fluid is not hygroscopic and therefore does not have to be replaced due to the increasing water content. As a rule, silicone fluid should be used only to fill systems that have not been previously filled with glycol-based fluid. A system that has used glycol-based fluid (DOT 3/4/5.1) will inevitably contain moisture and glycol fluid disperses this moisture throughout the system and contains corrosion inhibitors. Silicone fluid on the other hand does not allow moisture to enter the system, but also does not disperse any that is already in the system either. A system that has been filled from dry with DOT 5 silicone fluid does not require the fluid to be changed at regular intervals, but only when the system has been disturbed by a component repair or renewal. Silicone fluid usage is highest in cold climates due to its viscosity performance.I was told at the dealer parts counter that Volvo just buys brake fluid from whoever and re-brands it. That doesn't sound like they're importing the DOT 4+, made only by BASF in Europe. I also found this article which gives a lot of further information about brake fluids, especially where classic British motor cars are concerned. Glycol-ether (DOT 3, 4, and 5.1) brake fluids are hygroscopic (water absorbing), which means they absorb moisture from the atmosphere under normal humidity levels. Non-hygroscopic fluids (e.g. silicone/DOT 5 and mineral oil based formulations), are hydrophobic, and can maintain an acceptable boiling point over the fluid's service life. Ideally, silicone fluid should be used only to fill non-ABS systems that have not been previously filled with glycol based fluid. Any system that has used glycol-based fluid (DOT 3/4/5.1) will contain moisture; glycol fluid disperses the moisture throughout the system and contains corrosion inhibitors. Silicone fluid does not allow moisture to enter the system, but does not disperse any that is already there, either. A system filled from dry with silicone fluid does not require the fluid to be changed at intervals, only when the system has been disturbed for a component repair or renewal. The United States armed forces have standardised on silicone brake fluid since the 1990s. Silicone fluid is used extensively in cold climates, particularly in Russia and Finland. The information & links posted by Paulster2 offer excellent explanation of what the various types of brake fluid are.
Brake Fluid Ratings 2020 – Everything You Need to Know Brake Fluid Ratings 2020 – Everything You Need to Know
For Automatic Transmission Fluid the MB recommendation to conform to the so called Dexron III F-30111, F-30110, F-30321, etc.; again, any ATF, from any brand, that complies with their spec. is acceptable. They also have a short list with suggested specific products from different brands. Silicone based fluid is more compressible than glycol based fluid, leading to brakes with a spongy feeling. [14] It can potentially suffer phase separation/water pooling and freezing/boiling in the system over time - the main reason single phase hygroscopic fluids are used. [ citation needed] Characteristics of common braking fluids [15] [14] The early brake fluids contained castor oil-based hydraulic fluids and alcohols such as butanol and ethanol. These fluids were used before brake fluid regulations were established, and it is the DOT 2 standard that provides for these oil-based brake fluid. The advantage of the Citroën LHM mineral oil based brake fluid is the absence of corrosion. Seals may wear out at high mileages but otherwise these systems have exceptional longevity. It cannot be used as a substitute without changing seals due to incompatibility with the rubber. [17] [ user-generated source] Compressibility [ edit ]
In US, all brake fluids must meet Standard No. 116; Motor vehicle brake fluids. Under this standard there are three Department of Transportation (DOT) minimum specifications for brake fluid 3, 4 and 5.1. Most of the cars manufactured after 2006 use DOT4 brake fluid. Hygroscopic brake fluids should be changed every 1-2yrs because of the increasing water content due to moisture absorption. As a rule of thumb, the higher the DOT number, the higher the absorption rate and therefore the more often the fluid needs to be changed. Most brake fluids used today are glycol-ether based, but mineral oil ( Citroën/ Rolls-Royce liquide hydraulique minéral ( LHM)) and silicone-based (DOT 5) fluids are also available. [1] Standards [ edit ]
Brake Fluid Dot4 Plus 250ml | FREE UK DELIVERY | Flexible
Mobil Brake Fluid DOT 4 is recommended by ExxonMobil for use in applications requiring disc, drum and anti-skid braking systems used in average to high performance vehicles requiring DOT 3 or DOT 4 level performance. Recommendations for use include: The important thing is, you want a fluid that combines high minimum boiling point with low viscosity. The low viscosity is so your ABS/TRACS system works optimally. Quality standards refer to a brake fluid's "dry" and "wet" boiling points. The wet boiling point, which is usually much lower (although above most normal service temperatures), refers to the fluid's boiling point after absorbing a certain amount of moisture. This is several (single digit) percent, varying from formulation to formulation. Glycol-ether (DOT 3, 4, and 5.1) brake fluids are hygroscopic (water absorbing), which means they absorb moisture from the atmosphere under normal humidity levels. Non-hygroscopic fluids (e.g. silicone/DOT 5 and mineral oil based formulations), are hydrophobic, and can maintain an acceptable boiling point over the fluid's service life. While a vehicle that uses DOT 3 may also use DOT 4 or 5.1 (a temperature upgrade) if the elastomers in the system accept the borate compounds that raise the boiling point, [ citation needed] a vehicle that requires DOT 4 might boil the brake fluid if a DOT 3 (a temperature downgrade) is used. Additionally, these polyglycol-ether-based fluids cannot be mixed with DOT 5.0, which is silicone based. The Society of Automotive Engineers SAE has published standards J1703, J1704, and J1705, reflecting progressively higher performance for brake fluids. These have counterparts in the international standard, ISO 4925.
\n\t\t\tMobil Brake Fluid DOT 4
For Power Steering Fluid the MB recommendation is for MB Power Steering Fluid MB Part No. BQ 1 32 0001 Pentosin CHF 11S or MB Power Steering Fluid MB Part No. BQ 1 46 0001 or an approved Dexron III ATF, according to the Vehicle Model Year recommendation. Any fluid, from any brand, that complies with these two specs. is acceptable. Pentosin CHF11s by the way recommendation not only by MB, but also by Bentley, Porsche, Volvo, Saab, etc. Pentosin CHF11s is manufactured by Deutsche Pentosin Werke GmbH and is marketed under the Pentosin brand name or under different brand names such as MB, Volvo, VW, Land Rover, etc., with different internal part numbers, different price and different mark-up. The identical equivalent to the Pentosin CHF11s is the Febi S6161 fluid is manufactured by Febi-Bilstein Germany. The difference between them is a specificed standard regarding the boiling temperature, which rises as the DOT number rises, and amount of water absorption. ISO 4925:2020 - Road vehicles -- Specification of non-petroleum-base brake fluids for hydraulic systems". www.iso.org. One apparent red herring is the word "Synthetic" - Glycol based brake fluids may or may not claim to be "synthetic". This doesn't necessarily relate to whether the fluid is glycol based or silicon. However mixing for example Glycol DOT3 with Glycol DOT4 would give unpredictable performance. Nowhere have I seen anything saying "this is ok". I suspect the reason is that a mixture of formulations may give an unproven boiling temperature.
Mercedes GENUINE 1L Brake Fluid DOT 4 PLUS Ultra Low Mercedes GENUINE 1L Brake Fluid DOT 4 PLUS Ultra Low
a b "ISO 4925:2005 - Road vehicles -- Specification of non-petroleum-base brake fluids for hydraulic systems". www.iso.org. It contains at least 70% by weight of a diorgano polysiloxane. [7] Unlike polyethylene glycol based fluids, DOT 5 is hydrophobic. [8] An advantage over other forms of brake fluid is that silicone has a more stable viscosity index over a wider temperature range. Another property is that it does not damage paint. [ citation needed] The International Standards Organisation has published its standard ISO 4925, defining classes 3, 4, and 5, as well as class 5.1, class 6 [2] and class 7 [3] [4] reflecting progressively higher performance for brake fluids. The fluid was a low viscosity fluid based on diluted alcohol. [11] 49% alcohol 49% distilled water 1% triethanolamine phosphate ( surfactant) 1% sodium mercaptobenzothiazole ( stenching agent) Characteristics [ edit ] The Mobil Brake Fluid DOT 4 is suitable for all disc, drum and anti-skid braking systems used in average to high performance vehicles requiring DOT 3 or DOT 4 level performance. Features & Benefits:
Brake fluid is a central part of your brake system. It lubricates the internal mechanisms of the system and transfers the force your foot exerts on the pedal into the clamping force that stops your vehicle. For this reason, standards are put in place to ensure that the fluid meets key criteria and allows your brake system to work as designed. The Federal Motor Vehicle Safety Standards (FMVSS) under FMVSS Standard No. 116 [5] defines grades DOT 3, DOT 4, DOT 5 and DOT 5.1, where DOT refers to the U.S. Department of Transportation. These are widely used in other countries. Their classifications broadly reflect the SAE's specifications, DOT 3 is equivalent to SAE J1703 and ISO class 3, DOT 4 to SAE J1704 and ISO class 4, etc. [6] Brake fluids must maintain a low level of compressibility, even with varying temperatures to accommodate different environmental conditions. This is important to ensure consistent brake pedal feel. As compressibility increases, more brake pedal travel is necessary for the same amount of brake caliper piston force.
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