brake fuid

[payton31]

im about to buy new brake setup and i'm just wondering what brake fluid u guys use?

if it makes any difference set up will be -

brembo hc disks with ferrodo ds2500

and ktr braided hoses.

car will be doing a few track days this year.

 

[rich-6]

Normal dot 4, anything else is a waste of money IMO

 

[James23]

Just get some dot 5.1 fluid. higher boiling poin than dot 4. If you're a labels ***** get some branded stuff.

 

[edde]

Just get some dot 5.1 fluid. higher boiling poin than dot 4. If you're a labels ***** get some branded stuff.

5.1 is hydroscopic ie absorber water don't use it unless you fully bleed your brakes all the time race cars use it but the fluid never stays in them long.

5.1 isn't that much better than 4 and give it any time in use and 4 is better.

 

[James23]

5.1 is hydroscopic ie absorber water don't use it unless you fully bleed your brakes all the time race cars use it but the fluid never stays in them long.

5.1 isn't that much better than 4 and give it any time in use and 4 is better.

I thought all brake fluid absorbs water. And I thought it was dot 5 that race cars use (and is silicone based therefore not compatible with our road cars)

 

[rich-6]

VW dot 4 1lt £7 odd to the public

 

[edde]

I thought all brake fluid absorbs water. And I thought it was dot 5 that race cars use (and is silicone based therefore not compatible with our road cars)

Yep all brake fluid does it just depends how bad/quickly it absorbes it.

have a read here http://www.afcoracing.com/tech_pages/fluid.shtml

 

[BIGASH]

I use Motul RBF660 available from lots of places, Opie oils, Demon tweeks etc. Its got good wet and dry boiling points and is DOT 4 so won't cause any issues with the system

 

[James23]

Yep all brake fluid does it just depends how bad/quickly it absorbes it.

have a read here http://www.afcoracing.com/tech_pages/fluid.shtml

I don't see anything in there which suggests dot 4 is better than 5.1? (It could be that it's late and i'm tired..)

 

[edde]

I don't see anything in there which suggests dot 4 is better than 5.1? (It could be that it's late and i'm tired..)

4 Isn't better straight out the bottle only after a short time 5.1 will absort water quick so becomes worse than 4 at the same age.

5.1 is race car only.

 

[James23]

5.1 is race car only.

Pretty sure that that's not the case. Willing to be proved wrong though

 

[payton31]

whats a good boiling point then ? with dot4 like ?

 

[edde]

http://www.cliosport.net/forum/show...nd-fast-road-users.&highlight=5.1+brake+fluid Post 5

Or have a read here http://web6.pistonheads.com/gassing...13747&nmt=Which brake fluid is best, 4 or 5.1?

As for recomendation I use Castrol super dot 4 response good stuff and well priced.

 

[James23]

pistonheads link just has a load of people getting mixed up between dot 5 and 5.1. I'd be interested to see a proper technical article saying 4 is better than 5.1.

 

[James23]

And neither of them say that 5.1 is racing only?

 

[edde]

pistonheads link just has a load of people getting mixed up between dot 5 and 5.1. I'd be interested to see a proper technical article saying 4 is better than 5.1.

Only when after some time when they have both absorbed water the 4 will be better since it will still be usable the 5.1 won't

 

[payton31]

Process for full brake change ?

 

[mark smith87]

I've recently had DOT5 put in my car after fitting braided lines. The pedal is really good on track and no fade at all. I've got DS2500 pads all round and Brembo HC front discs

 

[mr.pink87]

Sure it's DOT5 and not 5.1? You shouldn't mix DOT4 and 5, only 4 and 5.1

 

[Jimbo_M]

Motul RBF660 is what i use on a very similar setup to the one you have mentioned and it works fantastic.

 

[davie_slim]

ive got 5 or 6 bottles of lexus/toyota dot 5.1 its supplied as part of the service kits from the main dealers, would it be worth using if im bleeding the full system and replacing the old stuff which may have never been changed? or go for dot 4?