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timeforwalkies Member
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Well it's finally together. All the brakes stuff that is. New front calipers, new rear cylinders and hopefully a master cylinder that dosn't leak. Next step is bleeding. Then adjust. Went to my local auto parts store and picked up what appeared to be the correct stuff, but is it? Valvoline SYN Power Full Synthetic brake fluid. Says it exceeds DOT3 & DOT4 and good to 500 degrees F. Anybody have an opinion about synthetic brake fluids? Thanks, Clif Did a little self research, and while I am still a bit confused I have decided to take the stuff back and get DOT4. If you are curious about why read this: http://www.xs11.com/tips/maintenance/maint1.shtml It is everything you thought you wanted to know about brake fluids and more. Good stuff Clif Last edited on 06-08-2007 06:29 am by timeforwalkies |
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Jensen Healey Super Moderator 
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I've had good luck with it. |
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timeforwalkies Member
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Read this. http://www.xs11.com/tips/maintenance/maint1.shtml I am sure you are OK, but read anyway so you know why. Thanks for the reply. |
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Jim Ketcham Member
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Valvoline SYN Power Full Synthetic is DOT 4. It is not silicone based which is DOT 5. I've used it in all my cars with no problems. |
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timeforwalkies Member
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OK>>>OK I just got off the phone with Valvoline. They say it is the same as DOT3 and DOT4 only better. They woudn't tell me what the synthetic is, but that is what makes it better and work for both DOT3 and DOT4 and work at higher temperatures. They say it has no negative effects on seals, older or newer. |
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Spaceman Member 
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My Jensen manual states to only use Dot 3 brake fluid, or an equivalent |
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gmgiltd Member
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Not sure if DOT 5.1 is available over there - it's fully compatible with DOT 3&4 but has a much higher boiling point. Note that DOT 5 is not compatible and will destroy your seals. Have a look at the following article. http://www.epicbleedsolutions.com/resources/faq/difference-between-dot4-and-dot51-brake-fluid/ Gordon |
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dbeliveau74 Member 
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That article didn't state anything about seals and dot 5 silicone brake fluid. I have it in my JH. And the previous owner used it for 22 + years. Is there any real information about this issue? |
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dbeliveau74 Member
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Here is an article I found which clarifies some of the questions. https://www.britishcarforum.com/bcf/archive/index.php/t-73218.html Cheers, Dan |
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gmgiltd Member
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Hi Dan, DOT 3,4 and 5.1 are glycol based and DOT 5 is Silicone based - glycol and silicone based fluids are not compatible with each other. In my case I upgraded the brakes to larger vented discs with 4 piston radial calipers on the front and rear discs with 2 piston calipers, but retained the original master cylinder. The braking system was previously filled with DOT 4 . The manufacturer of the discs and calipers (Hispec) advised me not to under any circumstances mix the two as the seals would be damaged -competition brake systems and road car upgrades are their core business so I would suggest that they have some experience in this field. DOT 5.1 has an even higher boiling point than DOT 5. I can't open the link you provided. Gordon |
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