Brake Fluid Q & A

Brake Fluid Q & A
Mike Evangelo of Dynamic Motorsports and Rossion Automotive e-mailed me with six questions about brake fluid. I like a challenge, therefore here are my answers. Click here to Read More ad

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1. What are the cardinal differences between synthetic fluid and conventional DOT 3 and 4 ?
Simple, it all comes down to the base stock. Both synthetic and conventional brake fluids start from the like “ polyethylene ethylene glycol ” stock. But, to make synthetic brake fluid the manufacturer will “ synthesize ” the original basis banal and make the molecules better and more consistent. They could make the chains longer or add other molecules to enhance the operation. Almost every synthetic brake fluid manufacturer does it different .
To the nucleotide stock they add the additive box. This is a mixture of anti-corrosion, anti-foaming and early privy chemicals that give the fluid the desire operation characteristics for operation in vehicles. ad DOT 5.1 is a high-performance certificate ( higher temps than DOT 5 ). To meet the performance standard, it takes a synthetic or very well conventional base stock .
silicone is a synthetic substance. But, don ’ metric ton confuse Dot 5 with man-made polyethylene glycol-based fluids like DOT 5.1 .
2. What is the compatibility between synthetics and conventional DOT 3 and 4 in most vehicles ?
Is a complete flush with newly rubber a better choice ? Is there any find of seal swelling or annihilation in older vehicles say from the 1930s, 1940s or even in the 1960s ?
All DOT 3, 4 and 5.1 brake fluids are compatible with each early and with all systems. All polyethylene glycol-based fluids will not harm healthy rubber eraser parts. besides, the linear packages will not damage or distort any rubberize parts. even if an older arctic part that has a high assiduity of natural rubber, they will not be damaged by newly DOT rated brake fluids. ad What kills rubber eraser parts is when the additive package breaks down. The linear package controls the ph of the fluid and the viscosity. If the bracken fluid becomes unable to control the ph or other corrosive elements, the arctic and metallic parts will deteriorate over time .
If you have an older vehicle and are worried about boiling the fluid, use DOT 4 or 5.1 brake fluid.

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3. Can synthetics be mixed where DOT 5 silicone was used or is it recommended that the rubber be replaced when changing back ?
Silicone is an inert substance, this is why it is safe for breast implants. technically it should not damage the arctic parts. ad Polyethylene diol based fluids ( conventional or synthetic ) will not mix with silicone fluid ( DOT 5 ). It will lump together somewhere in the system. besides, they will not react when it is interracial. therefore, if you perform a good sluice, the arctic parts and the organization should be OK..
4. now that it is known that copper contamination is the main argue that brake fluids degrade, what property do synthetics have to address this trouble ?
Copper comes from the copper braze in the walls of the arduous brake lines. copper can be a trouble for ABS and some valving. But, it is an index of the express of the bracken fluid. The more copper that is present, chance are greater that corrosion is happening in the system. When there is corrosion, it is a sign that the brake fluid ’ s anti-corrosion additives are depleted. ad If your base stock and additives are of higher quality, chances are that they will not break down equally easily as low-quality ingredients .
5. Compared to conventional fluent what life bridge can be expected from synthetics ?
In my opinion, it is about the lapp. synthetic fluid might be able to stopping point a little longer because the fluid can absorb more water before the fluid drops below a critical boil point. But, it is the additive box and environment that has the greatest affect on life bridge, no matter what type of base stock .
6. Some have said that they have noted a better pedal feel with synthetic fluids. Is this possible ?
Some very high-end synthetic DOT 4 and 5.1 synthetic fluids can give a better bicycle. But, it is sol belittled of a dispute that only the identical, very, identical best drivers can feel it. It is by and large in their head. ad

Some silicone-based fluids can give a softer pedal because it is more compressible than glycol-based fluids. But, some high-tech silicone ester-based thrust that some race teams use is less compressible than glycol-based fluids. But, this stuff can run $ 90 a liter ! besides, it does not have some critical corrosion inhibitors and is not DOT certified .
DOT 5 brake fluids still have their locate. Owners of testify cars can use the fluid if they are concerned about damage to the paint .
Thanks Mike !

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Category : Car Brakes