Rajan Wilcox
Brake fluid is a type of hydraulic fluid used in a hydraulic braking system to convert force into pressure, bringing a vehicle to a stop when the brakes are pressed. It contains polyethylene glycols that can react with rubber tires and cause them to soften, making them more vulnerable to blowouts and punctures. Due to glycol substances, continuous exposure can lead to cracks, brittleness, and loss of elasticity in the tire's rubber compounds. This is concerning, as some users have reported difficulties finding a compatible hose for their brake fluid reservoir, with some suggesting that fuel line hoses are incompatible.
| Characteristics | Values |
|---|---|
| Effect on rubber | Can cause rubber to become soft and swell, making it more vulnerable to blowouts and punctures |
| Effect on tires | Can cause tires to become slippery, reducing traction and control of the vehicle |
| Effect on paint | Corrosive |
| Hygroscopic | Yes |
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What You'll Learn
Fuel line hose is incompatible with brake fluid
Brake fluid is a type of hydraulic fluid used in a hydraulic braking system to convert force into pressure, bringing a vehicle to a stop when the brakes are pressed. It is a highly corrosive substance, capable of absorbing moisture from the atmosphere.
Brake fluid contains polyethylene glycols that can react with rubber, causing it to soften and swell. This can make the tires more vulnerable to blowouts and punctures. It can also cause tires to become slippery, reducing traction and control of the vehicle. Due to the glycol substances in brake fluid, continuous exposure can lead to cracks, brittleness, and loss of elasticity in the tire's rubber compounds.
Fuel line hoses are incompatible with brake fluid. This incompatibility is well-known, as most fuel line hoses will sweat the fluid right out. This is because the fluid can eat through the rubber over time, causing deterioration. Therefore, it is important to use a hose that is specifically designed to be brake fluid safe.
Some sources suggest that EPDM hoses can be used with brake fluid. These hoses are typically used for air and water where oil is not a factor. However, there is conflicting evidence about whether EPDM is truly compatible with brake fluid. Some people have reported using EPDM hoses in brake fluid reservoir applications with excellent results, while others have questioned its compatibility.
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Polyethylene glycol-based fluids are safe for rubber parts
Brake fluids are available in different varieties, including DOT 3, 4, 5, and 5.1. Polyethylene glycol-based fluids are safe for use with healthy rubber parts. They will not damage or distort rubber components, even those with a high concentration of natural rubber. This is true for both synthetic and conventional polyethylene glycol-based fluids.
The compatibility of polyethylene glycol-based fluids with rubber parts is due to the stable additive packages in these fluids. The additive package in a brake fluid controls its pH and viscosity. Over time, the additive package can break down, leading to a loss of control over pH and the emergence of corrosive elements. This breakdown is what causes deterioration in rubber and metal parts. However, as long as the additive package remains intact, the fluid will not harm healthy rubber parts.
It is worth noting that polyethylene glycol-based fluids are not compatible with silicone-based fluids (DOT 5). Mixing these two types of fluids will cause them to lump together, potentially causing issues in the system. However, they will not react chemically when mixed, so a thorough flush of the system can prevent any problems.
While silicone-based fluids are generally safe for rubber parts, they are more compressible than glycol-based fluids, resulting in a softer pedal feel. Additionally, some silicone-based fluids lack critical corrosion inhibitors and are not DOT certified, making them less suitable for certain applications.
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Brake fluid can damage rubber components
Brake fluid can be detrimental to rubber components, causing them to deteriorate over time. This is because brake fluid contains polyethylene glycols, which can react with rubber, causing it to soften, swell, and become brittle. This deterioration can lead to reduced traction and control of the vehicle, increasing the likelihood of tire failure.
Brake fluid is a type of hydraulic fluid used in hydraulic braking systems to convert force into pressure, bringing the vehicle to a stop when the brakes are applied. While it is essential for brake function, its corrosive nature can negatively impact rubber parts. The fluid is also a solvent, capable of dissolving certain materials, including rubber. This solubility contributes to the degradation process when rubber components are exposed to brake fluid.
The seals inside brake calipers are often made of rubber, and they play a critical role in maintaining the integrity of the braking system. However, prolonged exposure to brake fluid can cause these rubber seals to corrode or degrade, leading to decreased stopping power, leaks, and potential brake failures. This degradation is due to the presence of glycol substances in the brake fluid, which can break down the rubber compounds.
To prevent damage to rubber components, it is crucial to ensure that any spilled or leaked brake fluid is promptly cleaned up and that rubber parts are not exposed to the fluid for extended periods. Regular maintenance and inspection of the braking system can help identify any potential issues and ensure the safe operation of the vehicle.
It is worth noting that not all rubber parts are affected by brake fluid to the same extent. Some types of rubber, such as EPDM rubber, have been reported to be compatible with brake fluid and have been used successfully in brake fluid reservoir applications without issues. However, for most rubber components, especially tires, it is essential to minimize contact with brake fluid to prevent damage and maintain the safety and performance of the vehicle.
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Brake fluid is hygroscopic and corrosive
Brake fluid is made up of a base and a package of additives, including thickeners and anti-corrosion additives. The anti-corrosion additives are crucial as they prevent the fluid from corroding the metals used inside components such as calipers, wheel cylinders, master cylinders, and ABS control valves. These additives also protect against corrosion as moisture enters the system.
Glycol-ether (DOT 3, 4, and 5.1) brake fluids are hygroscopic, while non-hygroscopic fluids include silicone/DOT 5 and mineral oil-based formulations. It is important to note that DOT 5 should not be mixed with any other type of brake fluid as the mixing of glycol with silicone fluid may cause corrosion due to trapped moisture.
The use of a hygroscopic fluid is beneficial as it allows the water to remain in solution with the brake fluid, which, in turn, allows it to be used in colder temperatures before freezing. This is because the brake fluid will significantly lower the freezing point of the water.
In summary, while brake fluid is hygroscopic and can be corrosive under certain conditions, the use of a hygroscopic fluid is intentional and advantageous in preventing corrosion and maintaining the performance of brake systems.
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Glycol substances can cause cracks and brittleness in rubber
Brake fluid is a hygroscopic glycol-ester blend, which means it attracts water molecules from its surroundings. This property can cause issues with certain materials, including some plastics and rubbers. While there is limited information on the specific effects of glycol on rubber, it is known that glycol can cause degradation in plastics, leading to brittleness and cracking over time.
The seals inside brake master cylinders and calipers are often made of EPDM rubber or SBR rubber, and these materials can be affected by the chemicals in brake fluid. Some sources suggest that rubber lines can be used in brake fluid reservoir applications, indicating a level of compatibility between certain rubbers and brake fluid. However, it is important to note that not all rubbers are created equal, and the specific composition of the rubber can impact its resistance to chemicals like glycol.
Glycol, a versatile compound, is used in various commercial and industrial applications. It is a type of alcohol with unique properties that make it crucial in multiple industries, including automotive and HVAC systems. Ethylene glycol and propylene glycol are the most common types, each with distinct characteristics. Ethylene glycol, for example, is highly effective but poisonous, while propylene glycol is safer for human exposure.
The impact of glycol on plastics provides some insight into its potential effects on rubber. When exposed to glycol, plastics can degrade, leading to discoloration, loss of flexibility, cracking, and brittleness. In severe cases, the plastic may even become sticky or soft. This degradation occurs because glycol interacts with the polymers in the plastic, causing them to break down over time.
While the specific mechanism may differ, glycol can also affect the polymers in rubber, potentially leading to similar issues with cracking and brittleness. The sensitivity of a material to cracking depends on its shear modulus and failure energy. Softer materials are generally less susceptible to cracks, while more brittle materials with higher shear moduli are more prone to cracking. The presence of glycol can further exacerbate these tendencies, leading to the initiation and propagation of cracks in rubber-like materials.
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Frequently asked questions
No, fuel lines are incompatible with brake fluid. However, brake fluid can eat through rubber over time.
Brake fluid contains polyethylene glycols that can react with rubber, causing it to become soft, slippery, and more vulnerable to blowouts and punctures.
Brake fluid is also corrosive to certain materials, including paint.
