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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. ISO 4925:2020 - Road vehicles -- Specification of non-petroleum-base brake fluids for hydraulic systems". www.iso.org. You’ll notice that the table has columns named after the FMVSS 116 definitions of the grades except for the DOT 4+ column. The FMVSS defines DOT 3, DOT 4, DOT 5, and DOT 5.1 but It does not define the DOT 4+, the Super DOT 4, nor the DOT 4 – Class 6. There are three essential measures used to set a fluid’s final DOT rating that consumers should be aware of:
Mercedes-Benz Brake Fluid - YOUCANIC Best Mercedes-Benz Brake Fluid - YOUCANIC
Regular DOT 4 has a minimum Wet Boiling Point of 165 degrees Celsius, while the DOT 4+ spec is 180 degrees. Most Brake fluids are manufactured to meet standards set by international, national, or local organizations or government agencies.
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Brake fluids must have certain characteristics and meet certain quality standards for the braking system to work properly. grohgreg, just to clarify a couple of things here: one can use for his/her MB a brake fluid that conforms to the DOT4+, DOT4 PLUS recommended fluids or a brake fluid that complies with the DOT5.1 standard [please note the difference between recommendation and compliance].
FOSSER Brake Fluid DOT 4 Plus – Fosser FOSSER Brake Fluid DOT 4 Plus – Fosser
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 ] Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. I ask about Amsoil brake fluid because while they are called DOT 3 and DOT 4, they both have higher boiling points than called for by DOT 3 and DOT 4. Their DOT 3 and DOT 4 exceed the levels DOT 4 and 5.1, respectively. Presumably there are other characteristics than just temperature that are behind the DOT 3 and DOT 4 designations or Amsoil would have given them the designations. I would be interested to hear what someone from Amsoil has to say about that.
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The "DOT" system isn't linear. Meaning 5 is not better than 4. If you need DOT4, don't run DOT5. If you want a high quality DOT4, they make that; for example, I recommend Motul RBF600. Lots of people like ATE Superblue or it's non-blue counterpart.
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