DOT3, DOT 4, DOT 5 and DOT 5.1 Brake fluids are manufactured in our facility with sizes of 400g, 500g, 750g, 1000g packages.
You are welcomed to purchase for your own brand OEM or you may receive our brand names :QLUK, DEPAR, HELLA, TRW.
Brake fluid (brake oil) is a type of hydraulic oil used in hydraulic brake and hydraulic clutch applications in vehicles. It is responsible for transferring the force into high pressure, and to amplify braking force of the brake pads. As you apply your foot to the brake pedal, brake fluid transfers this force into pressure to the front and rear brakes and stops the vehicle. High quality brake fluids are incompressible and this makes your brake system very efficient.
What does DOT referring to in brake oils?
DOT is the abbreviation for Department of Transportation, that refers to the US department which classifies brake fluids according to the predetermined specifications. These specifications relate to their boiling points and chemical composition which are very important. Recent classifications are DOT 3, DOT4, DOT5 and DOT 5.1.
There are two reference tests that has been specified by DOT.
1- Dry boiling point; that is the boiling point of fresh fluid.
2- Wet boiling point; the boiling point after the fluid has absorbed moisture (the brake fluid after time spent in a real situation of outside circumstances)
The main difference between DOT3, DOT 4 and DOT 5 is the boiling point. If the boiling point is high, the more heat and abuse welcomed by the fluid. DOT 3 has the lowest boiling point and DOT 5.1. has the highest boiling point.
DOT3, DOT 4 and DOT5.1 fluids are hygroscopic and glycol based, that means they absorb moisture from the atmosphere. These brake fluids start to absorb moisture as soon as it is put in the car brake system or exposed to the air. The fluid get moisture through micro pores in rubber hoses, past seals and exposure to the air. As water enters the system it is dispersed throughout the whole brake fluid instead of pooling in low spots. Indeed this helps to keep the boiling point of the entire brake fluid high rather than having pools of water in the oil which will boil eventually sooner than the rest of the fluid.
DOT 5 brake fluid is hydrophobic and silicone based. As it is hydrophobic it has a tendency to refuse the water. Silicone fluid does not absorb water from the atmosphere while in service and it offers greatly extended lifecycle and improvement of the resistance to the corrosion of the main brake system parts. DOT 5 was introduced to give high temperature performance in contrast to DOT 4 but as it is silicone based it is not as suitable as glycol based oils for ABS pumps. The mixture of glycol and silicone based brake oils are not advised, can be dangerous in some cases.
You can always refer to our manufacturing and R&D engineers for your questions, please use the contact form on our website for any further information on brake fluids.