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Guys I have done some professional engineering-consulting on brake systems, so I have got the real deal as far as info goes on the brake fluid lowdown. Here it is, don't confuse any of this with trolling, this is something I know well on a professional level.
There are a lot of misconceptions about brake fluids, and you will hear all types of stories. The only difference between DOT 3 and 4 is 4 has a higher boiling point, which means it will hang in longer if you are getting medieval on the brakes. Once the brake fluid boils it is all over, even if the pads are still with you. Also Dot 3, & 4 both are Deliquescent, which simply means they absorb moisture like crazy. The two things that make brake hydraulic systems go south are corrosion from moisture in the fluid, and wear. Did you ever notice how master cylinders, and bottles of brake fluid tell you to keep them sealed...deliquescent, moisture magnet in liquid form.
Dot 5 really rocks, because it is not deliquescent, and that totally stops the abrasion of the corrosion in the hydraulic part of the brake system. Dot 5 is made of silicone, and it is a super lubricant, so it virtually eliminates the other chief enemy of the hydraulic system..WEAR. So no Deliquesence, radically reduced wear, and if that isn't enough it has a super high boiling point far above the boiling point of dot 3, or 4. And it doesn't rapae your paint.
You could mix a little of each one of these in a jar and shake them up, then use them and it would work fine, but it would have all the demons of the cheap DOT 3, because it has dot 3 in it, and it isn't pure. So if you are going to go to the expense to use dot 5 clean out the cheap stuff. It would really be best to break the system down and assemble it with DOT 5 as a lubricant, it isn't that big of a job. Pain in the but not that bad. Leaving some of the old crud in it is like taking a bath and putting on your dirty underwear. It just don't work as good.
Guys I have done some professional engineering-consulting on brake systems, so I have got the real deal as far as info goes on the brake fluid lowdown. Here it is, don't confuse any of this with trolling, this is something I know well on a professional level.
There are a lot of misconceptions about brake fluids, and you will hear all types of stories. The only difference between DOT 3 and 4 is 4 has a higher boiling point, which means it will hang in longer if you are getting medieval on the brakes. Once the brake fluid boils it is all over, even if the pads are still with you. Also Dot 3, & 4 both are Deliquescent, which simply means they absorb moisture like crazy. The two things that make brake hydraulic systems go south are corrosion from moisture in the fluid, and wear. Did you ever notice how master cylinders, and bottles of brake fluid tell you to keep them sealed...deliquescent, moisture magnet in liquid form.
Dot 5 really rocks, because it is not deliquescent, and that totally stops the abrasion of the corrosion in the hydraulic part of the brake system. Dot 5 is made of silicone, and it is a super lubricant, so it virtually eliminates the other chief enemy of the hydraulic system..WEAR. So no Deliquesence, radically reduced wear, and if that isn't enough it has a super high boiling point far above the boiling point of dot 3, or 4. And it doesn't rapae your paint.
You could mix a little of each one of these in a jar and shake them up, then use them and it would work fine, but it would have all the demons of the cheap DOT 3, because it has dot 3 in it, and it isn't pure. So if you are going to go to the expense to use dot 5 clean out the cheap stuff. It would really be best to break the system down and assemble it with DOT 5 as a lubricant, it isn't that big of a job. Pain in the but not that bad. Leaving some of the old crud in it is like taking a bath and putting on your dirty underwear. It just don't work as good.
Ray.
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