descartesfool

Brake fluid list for racing and driving on track.

One has to consider not just the dry/wet boiling points, but also the compressibility of the fluid and its ability to recover from over-temperature events, so it is not quite as simple as picking from the list.

and how about this for high tech brake fluid PROJECT MU G/FOUR 335 :
"Totally reliable brake fluid that combines a boiling point so high it's in another dimension with durability and maintainability. You know it's time to change your G-four 335 brake fluid, which can reach close to 300C, when the color changes from green to crystal clear."http://www.project-mu.co.jp/en/produ...her_fluid.html

...so you know when it's time to change it. and at about $30 per 0.5 litres, it is the best deal having the second highest dry boiling point. Not that much more than the el cheapo stuff I've been using for years, Motul RBF 600.

For those old school guys using ATE Super Blue, forget it. Wrong color, it has been discontinued. Don't forget if comparing price to compare the price per litre, not the price per bottle, as you could be fooled into thinking one fluid was not a good deal for the performance it offers, since size varies.

2013 11 26 Update on Castrol SRF now called Castrol SRF React Racing and boiling points are different than SRF. See Castrol's site. Wet BP is now 270C and dry BP is 320C

ARRANGED BY DRY BOILING POINT from 2018 for most
(some prices are out of date, and I have not checked prices lately, but if you check for price, pay attention to whether fluid comes in 1 litre bottles or 0.5L bottles. Check with your favorite supplier, and look for case prices so you can change it often):

DRY:401F -- WET:284F --- DOT3 MINIMUM (GLYCOL BASE)
DRY:446F -- WET:311F --- DOT4 MINIMUM (GLYCOL BASE)
DRY:500F -- WET:356F --- DOT5 MINIMUM (SILICONE BASE)
DRY:500F -- WET:356F --- DOT5.1 MINIMUM (GLYCOL BASE)
DRY:500F -- WET:???F --- FORD HEAVY DUTY DOT 3 PM-1C (new since 2006)
DRY:516F -- WET:284F --- AP RACING Radi-Cal R1 (0.5L OR 16.9 OZ)
DRY:527F -- WET:347F --- VALVOLINE SYNPOWER DOT3 & DOT4
DRY:536F -- WET:388F --- ATE SUPERBLUE/TYP200 ($13.99/1L)
DRY:550F -- WET:284F --- FORD HEAVY DUTY DOT 3 PM-1 (pre 2006) ($4/12 OZ)
DRY:570F -- WET:284F --- WILWOOD 570 ($7.95/12 OZ)
DRY:570F -- WET:284F --- PERFORMANCE Friction Z rated ($6.27/16 OZ)
DRY:572F -- WET:410F --- AP RACING 600 ($19.95/0.5L OR 16.9 OZ)
DRY:590F -- WET:???F --- TILTON TBR-1 ($11.95/0.25L) (new since 2006)
DRY:590F -- WET:518F --- CASTROL SRF ($74.99/1.0L 0R 33.8 OZ)
DRY:593F -- WET:421F --- MOTUL RBF 600 ($15.99/0.5L OR 16.9 OZ)
DRY:594F -- WET:399F --- AP RACING Radi-Cal R2 (0.5L OR 16.9 OZ)
DRY:601F -- WET:399F --- BREMBO LCF 600 PLUS ($19.95/0.5L OR 16.9 OZ)
DRY:608F -- WET:399F --- AP RACING Radi-Cal R3 (0.5L OR 16.9 OZ)
DRY:608F -- WET:518F --- CASTROL RECT SRF RACING ($65.00/1.0L OR 33.8 OZ)
DRY:610F -- WET:421F --- NEO SYNTHETICS SUPER DOT 610 ($11.95/12 OZ)
DRY:617F -- WET:399F --- MOTUL RBF 660 ($28.99/0.5L OR 16.9 OZ)
DRY:617F -- WET:363F --- PFC RH665($28.99/0.5L OR 16.9 OZ)
DRY:622F -- WET:???F --- TILTON TSR-1 ($17.95/0.25L) (new since 2006)
DRY:622F -- WET:392F --- FERODO FSF050 Super Race Brake Fluid ($39.99/0.5L OR 16.9 OZ)
DRY:622F -- WET:404F --- STOPTECH STR-660 (0.5L) (new since 2012)
DRY:622F -- WET:424F --- ENDLESS RF-650 ($33.00/0.5L OR 16.9 OZ) suppliers to the MERCEDES AMG PETRONAS Formula One Team
DRY:626F -- WET:392F --- PAGID RBF (0.5L) (new since 2012)
DRY:626F -- WET:417F --- WILWOOD EXP 600 ($18.99/0.5L 16.9 OZ)
DRY:635F -- WET:???F --- BREMBO HTC 64T ($32.00/0.5L 16.9 OZ)
DRY:635F -- WET:430F --- PROJECT MU G/FOUR 335 ($65.00/1.0L 33.8 OZ) price has gone up for 2013
DRY:644F -- WET:399F --- AP RACING Radi-Cal R4 (0.5L OR 16.9 OZ)
DRY:683F -- WET:439F --- PROSPEED RS683 or TORQUE RT700 ($29.99/0.5L OR 16.9 OZ) (new since 2013)

ARRANGED BY WET BOILING POINT:

DRY:500F -- WET:???F --- FORD HEAVY DUTY DOT 3 PM-1C (new since 2006)
DRY:590F -- WET:???F --- TILTON TBR-1 ($11.95/0.25L) (new since 2006)
DRY:622F -- WET:???F --- TILTON TSR-1 ($17.95/0.25L) (new since 2006)
DRY:635F -- WET:???F --- BREMBO HTC 64T
DRY:401F -- WET:284F --- DOT3 MINIMUM
DRY:516F -- WET:284F --- AP RACING Radi-Cal R1 (0.5L OR 16.9 OZ)
DRY:570F -- WET:284F --- WILWOOD 570
DRY:570F -- WET:284F --- PERFORMANCE Friction Z rated
DRY:550F -- WET:284F --- FORD HEAVY DUTY DOT 3
DRY:446F -- WET:311F --- DOT4 MINIMUM
DRY:527F -- WET:347F --- VALVOLINE SYNPOWER DOT3 & DOT4
DRY:500F -- WET:356F --- DOT5.1 MINIMUM (GLYCOL BASE)
DRY:500F -- WET:356F --- DOT5 MINIMUM (SILICONE BASE)
DRY:617F -- WET:363F --- PFC RH665 (new since 2011)
DRY:536F -- WET:388F --- ATE SUPERBLUE/TYP200
DRY:622F -- WET:392F --- FERODO FSF050 Super Race Brake Fluid ($39.99/0.5L OR 16.9 OZ)
DRY:626F -- WET:392F --- PAGID RBF (0.5L) (new since 2012)
DRY:594F -- WET:399F --- AP RACING Radi-Cal R2 (0.5L OR 16.9 OZ)
DRY:601F -- WET:399F --- BREMBO LCF 600 PLUS
DRY:608F -- WET:399F --- AP RACING Radi-Cal R3 (0.5L OR 16.9 OZ)
DRY:617F -- WET:399F --- MOTUL RBF 660
DRY:644F -- WET:399F --- AP RACING Radi-Cal R4 (0.5L OR 16.9 OZ)
DRY:622F -- WET:404F --- STOPTECH STR-660 (0.5L) (new since 2012)
DRY:626F -- WET:417F --- WILWOOD EXP 600
DRY:593F -- WET:421F --- MOTUL RBF 600
DRY:610F -- WET:421F --- NEO SYNTHETICS SUPER DOT 610
DRY:613F -- WET:424F --- ENDLESS RF-650 suppliers to the MERCEDES AMG PETRONAS Formula One Team
DRY:635F -- WET:430F --- PROJECT MU G/FOUR 335
DRY:683F -- WET:439F --- PROSPEED RS683 or TORQUE RT700 ($29.99/0.5L OR 16.9 OZ) (new since 2013)
DRY:590F -- WET:518F --- CASTROL SRF (perhaps no longer available and replaced by REACT SRF RACING)
DRY:608F -- WET:518F --- CASTROL REACT SRF RACING (new since 2013)


Some fluids on the manufacturer's web site did not specify wet boiling point, so I used the relevant DOT 3 value.

Water absorption:
DOT 3: This brake fluid has a glycol base with additives. It is clear to amber in color. It is hygroscopic (meaning it absorbs moisture) and has a minimum dry boiling point of 401F (205C) minimum and a minimum wet boiling point of 284F (140C). It will absorb 1 to 2 percent of water per year depending on climate and operating conditions.

Castrol SRF remains as always the Wet boiling champ, but newer React SRF Racing is not quite as high as the old stuff, 507F now vs 518F old, although dry boiling point has gone up from 590F to 608F.

Now of course boiling temp is not the only thing to consider, as compressibility, water absorption rate, recovery, viscosity index, etc all play a part. But without a brake dyno, that data is hard to get.

Here is an interesting chart of brake fluid compressibility: http://www.torquebrakefluid.com/comp...ke_fluids.html

Note that compressibility varies with temperature, and that lower number are better as the fluid is less compressible. But it is hard to get good info on that parameter, and there is much mis-information on the subject.

Many products are the same but branded under different names, and somehow have slightly different specs

Wet boiling point is of no importance if you fully change the fluid often. Water absorption happens no matter what you do and that lowers the boiling point slowly from the dry to the wet value. If you just bleed a little out of the calipers to have fresh fluid there, then stuff in the rest of the system is slowly absorbing moisture. After a few months, boiling point has begun to reduce. But if you have no fade, then it is irrelevant.

It's often hard to know if your braking problems are related to too much heat at the rotor/pad interface, poor bedding, wrong pads, or poor performing fluid. But fluid is super easy to change, and so you can change it out to see if problem goes away, and then start looking for other solutions if things don't improve.

So I would think for a car that sees much track duty, change fluid twice a year, starting just before first track day of the season, and then half-way through. Don't change it after the season is over, as it will just absorb moisture over the off-season. Fresh season, fresh fluid.

And if you know of any other ones...or find any typos...