As i have cooked my brakes at donnington last week ,i will be changing the fluid .I was wondering if there is anything on the market more geared to track day /race car spec than the normal .whatever???

Any help appreciated

 

comma 5.1dot

says for competition use on the bottle,
fook knows if its actually good shit, or ive been sucked in by buzz words and pretty pictures, but feels fooking amazing with it in..

 

CLICKY

 

As said 5.1 has a higher boiling point, but will need changing more often due to being more hygroscopic.
tabetha

 

Castrol SRF - fit and forget . It's wet boiling point (270°C !) is higher than that of most 5.1s DRY boiling point . Downside is, it's expensive - BUT it does not need changing as often, so works out no more expensive in the long term . My SRF has now been in the car for 5 years and I have had no problems, although I think I really should change it now .

See issue 254 of Fast Ford for full details . Just do a Google search for brake fluids, compare the wet and dry boiling points and you will see for yourself that NONE come close to matching Castrol SRF .

 

What about Motul RBF600, not as good as Castrol but its got a 312/216 C boiling points at a fraction of its price.

 

3 posts above


It also has a higher dry boiling point than the SRF

 

Seems a bit expensive though. I pay about Ł20 over here for the same items ie 3x500ml. But that was last year, perhaps the price has gone up?

 

Dunno, was the first link I came across when I was looking for it.

 

what brakes have u got..????...............they might be shite..????

 

i use castrol srf

 

As Tabs has said, brake fluid is hygroscopic (which means that it ABSORBS water), so how long do you thing the dry boiling point is going to last?

The fact that it has a dry boiling point 6 deg higher than the Castrol is immaterial, its the fact that when it starts to absorb water (which it does as soon as you fit it ), it's wet boiling point is over 50 deg WORSE than the Castrol SRF, and given that you would have to change brake fluid every 6 months for it to be as good as the Castrol SRF - that extra value isn't looking so good any more in either time or cost .

As I said, there is NOTHING that compares to Castrol on the market at the moment.

 

Mike, check my edited post. I looked the Motul figures up and edited the post 4 min after the original post. But I was too slow as some had already quoted it.

I thought they were pretty similar but as my edited post says it differs about 60 degrees at the wet point. Im not saying its the best but its good value for money. A lot of track day ppl use it over here with good results.

I guess it all comes down to how much and hard you track your car. I only go a couple of times a year so for me SRF feels like a waste of money. If I got as much Ring Action as you (God forbid ) im shure I would use SRF too.

 

castrol srf is the only one that can withstand extreme high temps,ive boiled the rest,expensive but the only way to go

 

how much does a cossie need to fill the system from empty ??

 

it's about 50 quid for a half litre bottle iirc!!!


steve

 

please bear in mind if changing from one type of fluid to another you must use sufficient to completely bleed through your old stuff.

on the subject I've found halfrauds DOT 5.1 good for fast road use @ Ł20 a litre its nearly as cheap as dot 4

 

Another SRF user here...

 

Well if you had checked my website instead of just guessing, you would have found that it is Ł35 for a full litre .

To do a full change and bleed it all the way through, you would need just over a litre .

 

Andreas,
But that is false economy, as the SRF can be used for much longer due to it's superior wet boiling point, so when you have changed your Ł20 a litre fluid twice (or even THREE times), the Castrol SRF user could still be on the same fluid and STILL have a better boiling point .

 

if you are changing brake fluid, i thoroughly recomend that you strip down your calipers at the same time and completely remove the old fluid.

it tends to collect old fluid behind the pistons that does not get bled out easily, and that fluid will be very wet if it's been in there a long time - and that is the most important place to not have wet brake fluid as it is where it will see the most heat

a good opportunity to check the seals and piston condition, and any sliders, pins etc can be cleaned up and greased to make sure that even brake performance is achieved on both sides of the disc to get the most out of your brakes

 

Top advice from Nick .

 

thanks mike

like you, i know that brakes are the most important thing on a track, and i find that a well maintained standard 2wd cosworth system is pretty good