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Synthetic Brake Fluid

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Guest Anonymous

A friend replaced some borrowed brake fluid with a number of bottles of Prestone "Synthetic Brake Fluid" Dot 3. It is clearly not the silicone based Dot 5 stuff. Before I start using it on every thing, does anyone have any experience with this product?

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personally like Valvoline Syntec, it has a dry BP of 513, higher than Castrol GTLMA and not too much short of Ate' Super Blue (539). It is inexpensive and you should be able to find it at all chain auto parts stores

Regards,

John N

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Guest

I thought "3" was drum brake, "4" was disk brake, "5" was snth and "5.5" (or what ever the newest stuff is) was none silicon.

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We use Elf Frelube 650 DOT 4 synthetic in just about everything at the shop. I've been having great luck with it, and it actually has a HIGHER boiling point than ATE, albeit by only a degree. Great stuff, under $20/L

Al

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the fluid has a higher boiling point, but it also doesn't aborb moisture like typical brake fluid. So it's more likely that moisture in your system will work it's way to your brake components. You need to do a full flush of your normal brake fluid to change to the synthetic, and then you should really change the fluid frequently so that you don't end up messing up your hydraulic system on your car. I've heard a lot of people use regular old Castrol LMA with good results, that's what I use.

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the fluid has a higher boiling point, but it also doesn't aborb moisture like typical brake fluid. So it's more likely that moisture in your system will work it's way to your brake components. You need to do a full flush of your normal brake fluid to change to the synthetic, and then you should really change the fluid frequently so that you don't end up messing up your hydraulic system on your car. I've heard a lot of people use regular old Castrol LMA with good results, that's what I use.

WHat you're saying there is just good practise anyway. Fresh fluid, changed often is the only way to go.

Al

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