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silicon brake fluid
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ukdave2002



Joined: 23 Nov 2007
Posts: 3656
Location: South Cheshire

PostPosted: Thu Jul 09, 2020 2:20 pm    Post subject: Reply with quote

I think that technically all glycol brake fluids must be synthetic? the brake fluids that you shouldn't mix are silicon and mineral.

Dave
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Ray White



Joined: 02 Dec 2014
Posts: 4188
Location: Derby

PostPosted: Thu Jul 09, 2020 2:27 pm    Post subject: Reply with quote

ukdave2002 wrote:
I think that technically all glycol brake fluids must be synthetic? the brake fluids that you shouldn't mix are silicon and mineral.

Dave


Yes but my point is that DOT 4 always was mineral but the DOT 4 on the shelf in the shop says SYNTHetic.

What happens if I add the DOT 4 synthetic to the DOT4 in my car which I remember to be mineral?

I thought synthetic was DOT 5 so always knew what to avoid. Now I don't know what to do.
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ukdave2002



Joined: 23 Nov 2007
Posts: 3656
Location: South Cheshire

PostPosted: Thu Jul 09, 2020 2:42 pm    Post subject: Reply with quote

Ray

Mineral fluids are all synthetic, there has never been a "natural" brake fluid, the word synthetic is probably added to the can by marketing folk!

synthetic does not equate to silicon Smile

Dave
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Ray White



Joined: 02 Dec 2014
Posts: 4188
Location: Derby

PostPosted: Thu Jul 09, 2020 2:50 pm    Post subject: Reply with quote

ukdave2002 wrote:
Ray

Mineral fluids are all synthetic, there has never been a "natural" brake fluid, the word synthetic is probably added to the can by marketing folk!

synthetic does not equate to silicon Smile

Dave


It's just me getting discombobulated again!!!

I have obviously been labouring under the impression that synthetic = silicon.

Thanks for putting me right.
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Miken



Joined: 24 Dec 2012
Posts: 382

PostPosted: Sun Jul 12, 2020 8:57 am    Post subject: Reply with quote

In my experience ,if you want to know about oils and lubricants, the best people to ask are the people who make the stuff.
Choose a manufacturer and ring up their technical department. They are always very pleasant ,knowledgeable people who are always seem happy to answer your questions. A couple of Weeks ago I wanted to know which oil to run in my Devon pick up so I called Morris oil, Penright, Castrol and Miller oils. All very helpful.
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lowdrag



Joined: 10 Apr 2009
Posts: 1433
Location: Le Mans

PostPosted: Sun Jul 12, 2020 4:58 pm    Post subject: Reply with quote

I have never had a problem with glycol-based fluid - no bubbles, no water, no rust, and the only difference between DOT4 and 5.1 is the boiling point. For spirited driving use the latter. I have used 5.1 for years, and always keep a couple of sealed litres on the shelf.
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