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brake_fluids_dot3_4_and_dot5 2013/10/26 12:33 current
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 +==Warning==
 +**Don't mix DOT3/4 with DOT5 brake fluid.** Don't change from one type of fluid to the other without flushing the system entirely, better don't change at all. If you mix, the fluid will become a jelly and renders the brakes useless.
 +
 +==Changing fluids==
 +If you are going to change fluids the best way is to replace all of the cylinders and the master cylinder and flush the lines with brake cleaner or alcohol. It can be done with original parts but you will have to drain ALL of the original fluid, fill the master cylinder with alcohol and bleed the system very well with alcohol and then blow out with air. Take the lines off of the cylinders and flush the lines with the new fluid of choice and then hook up the lines to the cylinders and flush the cylinders as well.
 +
 +==Types of Fluids==
 +DOT 5 silicone fluid differs to glycol fluids:
 +  -The military has liked its performance at -20F to -40F temperatures, although I have heard they may be changing.
 +  -Silicone fluid doesn't eat paint like the glycol fluids. This is the main reason collector car people use it.
 +  -Silicone has a higher boiling point than most glycol fluids, which means little to street drivers.
 +
 +
 +DOT 3 or 4 fluids are preferred for several reasons:
 +
 +  -These are the ONLY fluids recommended for ABS brakes, since DOT 5 silicone tends to pick up air bubbles during ABS actuation.
 +  -DOT 3 is the most commonly available fluid. DOT 4 has higher wet and dry boiling points, nearly that of DOT 5, and is compatible with DOT 3.
 +  -Nearly all OEM systems for decades have used DOT 3 or 4 fluid (or versions of 4 that we don't need to go into here). This means simple pressure bleeding equipment or manual methods will easily replace old, contaminated brake fluid with fresh new fluid. No cleaning or replacing seals or hoses required.
 +
 +==Determining the Type of Fluid in the System==
 +You need to find out which you have already in the system. Here's how:-
 +  -Get a dropper (an eye or ear-dropper) and withdraw some fluid from the master cylinder.
 +  -Put it into a glass jar and then add some clean water to the fluid.
 +  -Now put the lid on the jar and shake it well.
 +  -Let it stand for a few minutes.
 +  -If the water and the fluid have mixed thoroughly and can not be separately identified, then you have regular auto brake fluid.
 +  -However, if the water and the fluid have not mixed, or have formed blobs or layers, then the fluid is Silicone.
 +
 +That's all there is to it. Lots of people think that you can recognise which is which by looking at the colour of the fluid, or by its odor. Don't risk it. Use the test outlined above.
 +
 +//This section based on a G503 thread with inputs from Rickf, John Neuenburg and muttguru//
 
brake_fluids_dot3_4_and_dot5.txt · Last modified: 2013/10/26 12:33 (external edit)
 
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