Impurities (Contaminations) in Brake Fluid
Every product has impurities, some have come with raw materials and some are generated during the use. These impurities or contaminations always effect the quality of the product, hurdle in the operation, and reduce the life of the product and the equipment. In the brake fluid there are some impurities or contaminations, which effect the product and equipment. Most of these impurities are developed during the operation or by the mistake added. Main impurities are as per below : -
The brake fluid is hygroscopic in nature so, it absorbs moisture from atmosphere. Slowly its percentage increases. The moisture affects the product in below manner.
It reduces the boiling point of the brake fluid and with in two years and it comes on minimum permissible level.
- Viscosity rises in lower temperature, so more force to be applied for brake every time.
- Spongy brake paddle due to presence of water vapour.
- Brake failure chance increases in low temperature due to formation of ice crystal in line.
- Moisture wears the component failure due to internal rust and deterioration.
- Moisture iniciates the oxidation of brake fluid components to reduce their life.
In average a driver uses his or her brakes approximately 75,000 times in a year and expects them to function properly each and every time. Due to so much times operation, fine particle sludge has formed, which may causes following problems.
- May chocks the brake line.
- Increases the viscosity of brake fluid so extra force is required every time, indirectly it takes more time to apply the brake in full strength thus accident chance has increased.
Petroleum product: Petroleum means mineral oil based products like lubricating, gear, transmission, steering oil and grease etc; which are used in the vehicle. These products are some times have mixed with brake fluid. The petroleum products are rapidly and selectively absorbed by brake system rubber parts, resulting in a high degree of softening, dimensional swelling, and general deterioration of the functional properties of these rubber parts. This type of brake fluid contamination will result in unsafe braking action and may be the direct cause of complete brake failure.
Air : Some time air has trapped or blocked in brake system, the air acts as a vapour lock and feeling of brake becomes spongy.
Silicon oil : The incompatible brake fluid like DOT 5 is mixed with polyglycol based products like DOT3, DOT4 and DOT5.1 and viceversa.
Fatty oil : some times fatty oil like castor oil is mixed with in brake fluid. This increases the viscosity and reduces the life of brake fluid.
Antifreeze Coolant : This increases the viscosity of the fluid, reduces the boiling point in DOT 3, DOT4 and DOT 5.1and also reduces the stability during the hot condition. This also increases the corrosion of the equipment.