![]() The DOT could avoid a lot of confusion by giving this new fluid a different designation. DOT5.1 is a relatively new brake fluid that is causing no end of confusion amongst mechanics.It is also difficult to find, generally only available at selected auto parts stores. DOT5 is about twice as expensive as DOT4 fluid.DOT5 is slightly compressible (giving a very slightly soft pedal), and has a lower boiling point than DOT4.It may be necessary to do a series of bleeds. Small bubbles can form in the fluid that will form large bubbles over time. Careful bleeding is required to get all of the air out of the system.This can cause localized corrosion in the hydraulics. Since DOT5 does not absorb water, any moisture in the hydraulic system will "puddle" in one place.This is thought to be due to improper addition of swelling agents and has been fixed in recent formulations. Reports of DOT5 causing premature failure of rubber brake parts were more common with early DOT5 formulations.The best way to convert to DOT5 is to totally rebuild the hydraulic system. Most reported problems with DOT5 are probably due to some degree of mixing with other fluid types. (See more on this under disadvantages, below.) DOT5 is compatible with all rubber formulations.DOT5 does not absorb water and may be useful where water absorption is a problem.DOT5 brake fluid is also known as "silicone" brake fluid.Since DOT4 fluid still absorbs some water, any moisture absorbed by the fluid can encourage corrosion in the brake lines and cylinders.DOT4 fluid is generally about 50% more expensive than DOT3 fluid.DOT4 fluid eats paint! Small leaks around the master cylinder will eventually dissolve away the paint on your bodywork in the general vicinity of the leak, and then give rust a chance to attack the body of your car!. ![]() DOT4 fluid has a higher boiling point than DOT3 fluid, making it more suitable for high performance applications where the brake systems are expected to get hot.DOT4 fluid does not absorb water as readily as DOT3 fluid.DOT4 fluid is available at most auto parts stores, and at some (but not all) gas stations or department stores.The most familiar brand is "Castrol GT-LMA" DOT4 brake fluid is the brake fluid suggested for use in late model Triumphs.Since DOT3 fluid absorbs water, any moisture absorbed by the fluid can encourage corrosion in the brake lines and cylinders.(This is often referred to as being hydroscopic.) As such, once a container of DOT3 has been opened, it should not be stored for periods much longer than a week before use. DOT3 fluid absorbs water very readily.DOT3 will damage natural rubber brake seals and should not be used in any car suspected of having natural rubber seals (most Triumphs prior to 1968).DOT3 fluid is inexpensive, and available at most gas stations, department stores, and any auto parts store.One of the most familiar brands is "Prestone." DOT3 brake fluid is the "conventional" brake fluid used in most vehicles.I had total brake failure - sudden and without warning - with DOT 5 Silicone - not to be confused with DOT 5.1 which is NOT silicone. DOT 5 is silicone based and comes with a safety warning on the can - and for good reason. When I drain it out years later, it looks as good as new and there is no sludge, no stuck pistons, no deteriorated soft seals or boots.Ĭlick to expand.What he says - DOT 5.1 is Polyethylene based. Dot5 does not absorb moisture out of the air and thus does not turn into rusty mushy sludge in the brake systems of the many ol cars I drive. How can anyone argue with success? Like Don I have used Dot5 from Advance Auto and other part stores with enormous success for 20 years. Last year I drained the brake system when I redid my 27 and the 20 year old Dot 5 came out like the day I put it in. Mainly to protect the paint on my suspension and brake components, but also because it just works fine for me. QUOTE=Donshotrods For over 20 years I have run Dot 5 exclusively. America quit using real rubber during WWII I seriously doubt if there is ANY natural rubber ANYWHERE in a car. QUOTE=rld14 Castrol GT/LMA Dot4, it's a lot safer if there's any natural rubber in your braking system. I am sure the original poster is asking about Traditional Hotrods which are assembled at home using ordinary parts which are probably made in China and which are from parts stores as available. Click to expand.That applies to late model cars built in a factory.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |