Wot brake fluid best for trackday/road car.
30-07-2005, 05:39 PM
#2
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castrol SRF, only dot 4, but go compare the dry and more crucially wet boiling points of it,
not cheap, retail is £40 a litre and you need 2 litres to doa cossie brake setup,
ps, do you want to pm me about how secs got on?
not cheap, retail is £40 a litre and you need 2 litres to doa cossie brake setup,
ps, do you want to pm me about how secs got on?
30-07-2005, 05:48 PM
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well i had Delphi dot 4 in mine, was about year old, and boiled up on my 2 trackday.
on the can
wet boil point 170 oC, dry 270 oC
just puttin dot 5.1 at mo.
wot temps wet/dry boilin point on castrol SRF?
ps simon hasn't got back to me, since he sed he was gonna ring.
on the can
wet boil point 170 oC, dry 270 oC
just puttin dot 5.1 at mo.
wot temps wet/dry boilin point on castrol SRF?
ps simon hasn't got back to me, since he sed he was gonna ring.
30-07-2005, 06:32 PM
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I used a decent 5.1 changed regularly in my cossie on track days without a single problem.
For a track car, I'd run SRF as I do now, but for a road car, a decent 5.1 would be absolutely fine.
For a track car, I'd run SRF as I do now, but for a road car, a decent 5.1 would be absolutely fine.
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30-07-2005, 09:24 PM
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Alex didn't say DOT doesn't matter - it does, but it relates to a test that the fluid must meet to obtain minimum boiling points (wet and dry).
The DOT rating is important in so far as you shouldn't mix certain types with each other e.g. DOT 5 (silicone based) must not be mixed with other fluids (DOT 3 or 4 for example) and silicone based fluid can damage brake components if they weren't designed for it (seals mainly).
DOT 3&4 are hygroscopic (absorbs moisture) whereas DOT 5 isn't. It's the absorbed water boiling that can cause problems, but this shouldn't be a problem on a well maintained vehicle.
DOT 5.1 is synthetic (Glycol Ether Ester), but not silicone based and so not compatible with DOT 5.
The DOT rating is important in so far as you shouldn't mix certain types with each other e.g. DOT 5 (silicone based) must not be mixed with other fluids (DOT 3 or 4 for example) and silicone based fluid can damage brake components if they weren't designed for it (seals mainly).
DOT 3&4 are hygroscopic (absorbs moisture) whereas DOT 5 isn't. It's the absorbed water boiling that can cause problems, but this shouldn't be a problem on a well maintained vehicle.
DOT 5.1 is synthetic (Glycol Ether Ester), but not silicone based and so not compatible with DOT 5.
01-08-2005, 10:03 AM
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BRAKE FLUID DRY BOILING POINT WET BOILING POINT
AP SUPER 600 590oF 410oF
CASTROL SRF 590oF 518oF
NEO SUPER DOT 610 610oF 421oF
MOTUL RACING 600 593oF 420oF
MOTUL DOT 5.1 509oF 365oF
ATE SUPER BLUE 536oF 392oF
VALVOLINE SYNPOWER 503oF 343oF
ATE SL 500oF 329oF
CASTROL LMA 450oF 311oF
AP 551 528oF 288oF
AP SUPER 600 590oF 410oF
CASTROL SRF 590oF 518oF
NEO SUPER DOT 610 610oF 421oF
MOTUL RACING 600 593oF 420oF
MOTUL DOT 5.1 509oF 365oF
ATE SUPER BLUE 536oF 392oF
VALVOLINE SYNPOWER 503oF 343oF
ATE SL 500oF 329oF
CASTROL LMA 450oF 311oF
AP 551 528oF 288oF
02-08-2005, 04:37 PM
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cheers lads.
i'm gonna do another trackday on my fresh 5.1 and see it goes, if worse comes to worse i'll put new stuff in duein sessions.
i'm gonna do another trackday on my fresh 5.1 and see it goes, if worse comes to worse i'll put new stuff in duein sessions.
02-08-2005, 04:47 PM
#16
dont risk the synthetic fluids there shite , you need brake fluid to be hydroscopic for a reason trust me , ive described/discussed this many tims, i personally use ATE BLUE, but i believe the best on the market now to be srf - would NEVER use 5.1 fluids ever
02-08-2005, 05:30 PM
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Originally Posted by markk
dont risk the synthetic fluids there shite , you need brake fluid to be hydroscopic for a reason trust me , ive described/discussed this many tims, i personally use ATE BLUE, but i believe the best on the market now to be srf - would NEVER use 5.1 fluids ever
Why do you want BF to be hydroscopic?
02-08-2005, 05:58 PM
#19
Rich_w,
Why do you want BF to be hydroscopic?
Why do you want BF to be hydroscopic?
well the truth is you dont, but if its not then moisture will not be absorbed into the particular hydraulic fluid but will stay in the lines as moisture, then forming water/vapour lock in the lines then you will press the brake and will have a massive water bubble in the lines and as you cant compress it it will boil off when reaching 100deg then you will loose the brake pedal completely, with the likes of dot4 all it needs is changing regularly, when it absorbes the moisture the result is only a lower boiling point butyou will still have a pedal and will still work once cooled hence the reason not to use dot 5.1
03-08-2005, 10:47 AM
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Originally Posted by Mike Rainbird
He does, Bill, you just can't spell H Y D R O S C O P I C 
.
.Basic GCSE Chemistry Mike, really
Oh, and on Bill's behalf:
03-08-2005, 12:49 PM
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Mr PON, thankyou kind sir
....I take it you mean privileges Mike As for doubting me...... 
Originally Posted by Mike Rainbird
I humbly accept the above and it is indeed everyone else who can't spell 
.
Bill will never let me forget this now. Perhaps time for abuse of my mod privalleges to make it look like it never happened .
and it is indeed everyone else who can't spell .Bill will never let me forget this now
. Perhaps time for abuse of my mod privalleges to make it look like it never happened . As for doubting me......
03-08-2005, 01:04 PM
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Originally Posted by RichardPON
Twice in one day Mike?
You're losing your abilities with the approach of old age and senility!
By the way, did I tell you about the
sexual encounter I had the other day? 
You're losing your abilities with the approach of old age and senility!
By the way, did I tell you about the
sexual encounter I had the other day? Power corrupts! LOL
PS. I sleep in yellow pyjamas
**Illegal use of moderator powers**
03-08-2005, 03:03 PM
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Originally Posted by Billabong
I take you don't understand the term then Rich
Damn you
And damn whoever it was who told me it was hydroscopic
03-08-2005, 05:28 PM
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I understand that Mark, and did indeed suspect that is why you used that term, but hey, just call me pedantic
Replied to your other thread quite late last night btw - hope it helps.
Replied to your other thread quite late last night btw - hope it helps.