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Post by morgy on Oct 24, 2019 21:52:10 GMT 1
Anyone have experience with using mineral oil based Fluids for there braking systems on there RD's
We have been using Royal blood by Magura in our Sur-Ron e bikes for a while and i noticed they do Magura Blood (red) for Motorbikes,
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Post by rich on Oct 25, 2019 0:01:38 GMT 1
What's wrong with good old dot 4?
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Deleted
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Post by Deleted on Oct 25, 2019 3:45:12 GMT 1
I think DOT 3 is/was the specified fluid for most things Japanese
There is an ingredient in DOT 4 that’s illegal in Japan, it also doses the rubber brake lines that are used by the Japanese which will swell when the brakes are applied leaving you with what feels like air in the system
I came across this issue 25 years ago in a hire car garage, the guy just couldn’t get the brakes to pump up on a Landcruiser, so I said I’d help him out and whilst he pumped the brakes I’d look for any thing suspicious
Low and behold I saw the brake lines balloon out under pressure, swapped position with him, I had a look at the master cylinder which said only use DOT 3, he was using DOT 4 for the last three years,he had to go and change out every brake line on every Japanese vehicle
He was dumbfounded, we also had averted what could have been multi calamitous incidents
Check the top of your master cylinders to be sure, modern machinery could well be different now, older may not
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Post by headcoats on Oct 25, 2019 10:00:44 GMT 1
My Triumph and the Nissin front master cylinder for the Hybrid say "Only use Dot 4 brake fluid "
I get Castrol Dot 4 but only get 0.5 litre bottle as once opened it must be used in 12 months
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Dave B
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Post by Dave B on Oct 25, 2019 10:48:35 GMT 1
Somebody gave me some DOT 5 brake fluid once. I think that is aircraft spec, but it worked fine in my race bikes, and does not absorb water like DOT4, apparrently.
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Post by morgy on Oct 25, 2019 12:46:08 GMT 1
What's wrong with good old dot 4? Nothing wrong with DOT 4-5 but i am messy and always seem to get brake fluid everywhere  I was thinking of using mineral based to save spoiling the painted surfaces, It also has the benefit of being hydrophobic not hygroscopic like normal brake fluids.. |
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Post by morgy on Oct 25, 2019 12:50:12 GMT 1
My Triumph and the Nissin front master cylinder for the Hybrid say "Only use Dot 4 brake fluid " I get Castrol Dot 4 but only get 0.5 litre bottle as once opened it must be used in 12 months I have Brembo RCS19 brake and RCS16 clutch but haven't been able find out recommended fluids for these Masters.. Rear brake master is a Brembo and so is the rear caliper.. Up front I have Tokico calipers.. |
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Post by headcoats on Oct 25, 2019 13:07:40 GMT 1
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Post by Deleted on Oct 25, 2019 15:45:38 GMT 1
Perhaps your Triumph isn’t made in Japan
I’d go with what it says on top of your master cylinder, a bit like using genuine crank seals, you really don’t want a failure in either place
Particularly if you are using original brake lines and the original seal on top of it
If using braided lines it probably doesn’t matter
DOT 5 I believe does not affect paint as 3 or 4 do
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coose
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Post by coose on Oct 25, 2019 16:22:01 GMT 1
Don't use DOT 5 as it's silicone and will eat your seals unless you have a Harley. DOT 5.1 is the stuff...
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Post by Deleted on Oct 25, 2019 17:22:53 GMT 1
learnt something there
So had a look at the top of my yamaha genuine master cylinder and it's says use only dot 3
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Post by morgy on Oct 25, 2019 19:51:13 GMT 1
I’d go with what it says on top of your master cylinder, a bit like using genuine crank seals, you really don’t want a failure in either place Particularly if you are using original brake lines and the original seal on top of it If using braided lines it probably doesn’t matter DOT 5 I believe does not affect paint as 3 or 4 do Everything is new! nothing on the masters etc, as above Brembo RCS19 RCS16 , Galfer braided lines.. My main question was anyone using Mineral based Fluids not really anything with a dot in it.. |
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Post by bare on Oct 26, 2019 0:55:55 GMT 1
Real question is: Why? do you want to use the mineral goop? Discount? backhander?
Regular Pedestrian Brake fluid has/is working 'Fine'.
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Post by JonW on Oct 26, 2019 1:03:34 GMT 1
Ive used DOT5 (silicone) in classic cars and it was fine. It has a different feel and is a little spongy, but works fine as is a somewhat fit and forget which is great for those cars.
I run Dot4 in my bikes. perhaps i should be using dot3 then... hmm... looking it up it seems the Borate Esters that DOT4 has over DOT3 are the things that cause the swelling. That probably will help your old master cylinder seals but not old style rubber only hoses. learn something new ever day...
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Post by morgy on Oct 26, 2019 9:11:49 GMT 1
Real question is: Why? do you want to use the mineral goop? Discount? backhander? Regular Pedestrian Brake fluid has/is working 'Fine'. Sorry i thought i said in my original post!.. We use Magura fluids in our E bikes, No Back handers as i wont be or wouldn't use the same products as what we use is not suitable, But they do do a product for Motorbikes i could use.... Just got me thinking as it is not hygroscopic and will not damage my painted surfaces when i bleed my system. I have 6 pots and did read there a pig to bleed.. I have spent hours on my calipers and do not want to damage them...  IMG_3650 by mark morgan, on Flickr  IMG_3651 by mark morgan, on Flickr |
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coose
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Post by coose on Oct 26, 2019 10:02:42 GMT 1
Ok, back on topic then. 😉 Here's an interesting article, where it's based around mountain bikes but it's very relevant. www.epicbleedsolutions.com/blog/dot-brake-fluid-vs-mineral-oil/Basically, only use mineral oil if your brake system has no traces of brake fluid and there's absolutely no chance in there being any contact with air, and under no circumstances use Magura Royal Blood as it will boil by the time you get to the end of the street.... |
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Post by morgy on Oct 26, 2019 10:25:40 GMT 1
Ok, back on topic then. 😉 Here's an interesting article, where it's based around mountain bikes but it's very relevant. www.epicbleedsolutions.com/blog/dot-brake-fluid-vs-mineral-oil/Basically, only use mineral oil if your brake system has no traces of brake fluid and there's absolutely no chance in there being any contact with air, and under no circumstances use Magura Royal Blood as it will boil by the time you get to the end of the street.... Thanks Coose... interesting read... |
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Post by 4l04ever on Oct 26, 2019 17:24:31 GMT 1
I use DOT 5, as I wanted to make sure my paintwork was not damaged if any leaked. Have been using for the last 10 years with no issues so far :-)
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Post by morgy on Oct 26, 2019 18:19:47 GMT 1
I use DOT 5.1, as I wanted to make sure my paintwork was not damaged if any leaked. Have been using for the last 10 years with no issues so far :-) Thought 5.1 was corrosive to paint 5.0 wasn't as it was silicone based. |
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Post by stusco on Oct 26, 2019 18:29:27 GMT 1
My mate used the mineral oil in his Ktm 950 smr but I think it was for the clutch it was a magura
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Post by morgy on Oct 26, 2019 18:51:12 GMT 1
My mate used the mineral oil in his Ktm 950 smr but I think it was for the clutch it was a magura I think BMW, KTM and Husky use Magura... Just not sure they use there (red) blood in the brakes or just clutch, Royal blood is the blue |
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Post by 4l04ever on Oct 26, 2019 21:18:12 GMT 1
I use DOT 5.1, as I wanted to make sure my paintwork was not damaged if any leaked. Have been using for the last 10 years with no issues so far :-) Thought 5.1 was corrosive to paint 5.0 wasn't as it was silicone based. My mistake! Just checked in garage and it is DOT 5 I have been using and no paint damaged :@) |
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coose
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Post by coose on Oct 27, 2019 10:38:36 GMT 1
My mate used the mineral oil in his Ktm 950 smr but I think it was for the clutch it was a magura I think BMW, KTM and Husky use Magura... Just not sure they use there (red) blood in the brakes or just clutch, Royal blood is the blue Just in the clutch - the brakes use normal brake fluid. I use Motul RBF660 in my 950 Adventure as the can boil normal DOT 3/4/5.1 in the back brake with "spirited" riding. Yes, I did find this out for myself...😉 |
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Post by 75rd350rider on Nov 13, 2019 23:55:53 GMT 1
I use only DOT5 in all my bikes for the last 15 years with excellent results.
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I was thinking of using mineral based to save spoiling the painted surfaces, It also has the benefit of being hydrophobic not hygroscopic like normal brake fluids.. 
