Mineral Oil for Hydraulic Bicycle Brakes

What fluids are suitable for bicycle brakes?

mineral, hydraulic, bicycle, brakes

What fluids are suitable for bicycle brakes?

Brakes are one of the most important elements of a bicycle. They can be mechanical. this is when a cable is used to transfer energy from the handle to the braking mechanism, as well as hydraulic, in this version, brake fluid is used. (how to bleed hydraulic disc brakes)

Basically, each manufacturer recommends their own hydraulic brake fluids, Shimano produces a special mineral oil and does not recommend using anything else. Hope recommends using DOT 4 or DOT 5.1 automotive brake fluid.

High requirements are imposed on liquids:

1) The liquid should not cause corrosion of metals, as well as destroy oil seals and seals;

2) Liquids must be resistant to low temperatures, must not thicken and freeze;

3) It should also be resistant to high temperatures, should not expand and boil when heated;

4) Must be able to chemically bind water that enters it (water in the hydraulic brake system not only causes corrosion, but can also boil when the caliper heats up).

Some of the existing brake fluids:

There are two fundamentally different types of fluids that are poured into brakes. these are mineral oils (Magura, Shimano) and DOT3 / 4/5 brake fluid (Hayes, Hope, Formula).

Since these liquids have different bases, they should never be mixed or replaced. Brake fluid has a more aggressive effect on metals and seals, therefore, in brakes designed for mineral oil, the brake must not be filled!

Automotive brake fluids.

DOT3. glycol base boiling point. 205C stability viscosity at 40C. 1.5 ultra-high hygroscopicity, service life. 10-12 months

DOT4. glycol base boiling point. 230C (actually. about 260) stability viscosity at 40C. 1.5 high hygroscopicity, service life. 24 months

DOT5. silicone base boiling point. 260C (actually. up to 300) stability viscosity at 40C. 1.5 practically zero hygroscopicity, high lubricating properties, with a complete absence of anticorrosive properties; service life. up to 15 years

Easiest Way to Add Fluid to MTB Hydraulic Disc Brakes | 4k

DOT5.1. glycol base boiling point. 250C (actually. about 280) stability viscosity at 40C. 1.5 highest fluidity, low hygroscopicity, service life. up to 5 years properties of slurry are provided by synthetic additives

Mineral oils for hydraulic brakes:

Mineral Oil for Hydraulic Bicycle Brakes

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I filled my mountain bike brakes with baby oil for a year and here are the results!

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    This article focuses on modern bicycle disc brake systems and brake fluids that are used in them. In this material, we will not touch directly on the mechanical part of the brakes, but consider only the hydraulic systems.

    For over 20 years, modern mountain bikes (and more recently road bikes) have used hydraulic disc brakes as one of the most efficient braking systems. Bicycle disc hydraulic brakes can use 2 types of hydraulic brake fluids. mineral oil and DOT brake fluid. Usually a liquid of at least DOT 4.1 standard is used.

    What does DOT 4.1 or other standards (DOT 5, DOT3, etc.) mean? This is the unified standard for hydraulic brake fluids for auto, motorcycle and bicycle equipment. The higher the specified value, the higher the boiling point of the specified brake fluid. For example, in the DOT5 standard, the boiling point is about 260 degrees. This means that there is no better fluid for extreme cycling styles such as freeride, downhill or enduro. Simply put, your brakes will not fail on long descents if you have sufficient control technique. DOT brake fluids are used in disc brakes such as Sram, Hayes. When using your bike, it is necessary to periodically carry out preventive maintenance of the brake system based on POT fluid, since these types of brake fluids can absorb moisture or “air”, despite the fact that the system is sufficiently tight. When this happens, the brakes lose their properties and this threatens with unpleasant consequences for the cyclist. When moisture gets into the torium system of a bicycle, the boiling point of the brake fluid decreases and, accordingly, the risk of brake failure during prolonged use increases. If air enters the system. the brake lever fails and the braking efficiency disappears, up to a complete failure of the hydraulics.

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    Shimano brakes use mineral brake oil. Let’s take a look at the benefits of mineral oil-based braking systems. Mineral oil has a slightly different structure and properties than DOT fluids. For example, it is less susceptible to moisture and its absorption from the external environment. But in any case, it is impossible to make the system hermetic as much as possible. Hydraulic brakes on mineral water can also “collect water”. In this case, with a mineral brake system, this water will not dissolve in the fluid, but will partially settle in the caliper, thereby lowering the boiling point of the fluid. And thereby violating the standard properties of the braking system. In this case, Shimano mineral oil based brakes need to be serviced more regularly than POT fluid based brakes. But at the same time, mineral oil bicycle brakes will have a softer modulation and clarity of operation.

    There are many types of fluids to choose from to service your disc brakes, but knowing the basic type is key. DOT or mineral water. For home bleeding of brakes, a brake fluid of 100-200 ml is sufficient, depending on the volume and number of brakes being pumped. If you want to take brake fluid for a workshop. the best solutions will be brake fluids in liter containers.