Wrench (1k)  Brake Fluid Comparison

 
This information was compiled by Gary (ghackney@iglou.com) and posted to the Saturn Performance Club Mailing ListIf you benefit from this info, be sure to send him a thank you.

"Here's the results of a couple days web research.

The BP After 3-months and 6-months columns are estimates based on a page I found that says brake fluid gains about 3.5% moisture per year, which is where the wet boiling point is measured.  Assuming linear degradation this column is where you'd be.

The last two columns may be confusing.  They're the price per ounce, divided by the degrees F the fluid exceeds the dry or wet DOT spec; sort of a price for performance number where lower is better.  Yeah, I'm an engineer.

FWIW:  My conclusion:  ATE Type 200 and Super Blue are not only the cheapest of the performance brake fluids, they are also the cheapest per degree of boil protection, and have a very high 6-month BP estimate. In addition you can alternate with each change and the color difference will tell you when you're done.  Available from ogracing.com.

 

Fluid Dry BP Wet BP Approx BP after 3 mo. Approx BP after 6 mo. US $/oz US $/oz per F > DOT4
Dry Wet
Castrol SRF 590 518 572 554 2.076 .0144 .0100
NEO Super DOT 585 421 544 503 0.983 .0071 .0089
Motul Racing 600 585 421 544 503 0.712 .0051 .0065
Wilwood Hi-temp 570 570 284 499 427 0.496 .0040 [.0184]
AFCO Racing (570 Gold) 570 0.500 .0040
AP600 572 378 524 475 1.062 .0084 .0159
Ford Heavy Duty DOT3 550 290 485 420
Performance Friction Z-Rated 550 284 484 417 0.492 .0047 [.0182]
ATE Type 200/ATE Super Blue 536 392 500 464 0.295 .0033 .0036
AP550 531 261 464 396 0.648 .0076 [.0130]
Valvoline High Perf Synthetic 513 333 468 423
Motul DOT 5.1 509 365 473 437 0.675 .0107 .0125
ATE SL 500+
DOT 5 Spec 500 346 462 423
Castrol LMA 450 311 415 381 0.219 .0547
DOT 4 Spec 446 311 412 379
DOT 3 Spec 401 284 372 343

You can download Gary's spreadsheet of this info here:  Excel, Lotus 1-2-3.

Comments:Rotor (12k)

I found all this on the web and nothing is guaranteed to be correct.
Wet boiling point is measured at 3.5% moisture, typical for one-year-old fluid.
AP600 is not compatibile with any other fluid.
Ford HD DOT3 is cheap and good for racing but has a low wet boiling point.
ATE Type 200/Super Blue is recommended by BMW.
ATE SL is OE on many European performance cars.
Martel Bros. offers a 5% discount if you mention their web site when ordering.


URL's for the above fluids plus other good info:

http://www.panteracars.com/motul.html      (VERY informative)
http://www.neosyntheticoil.com/bkfluid.htm
http://www.martelbros.com/wilwood/59.htm
http://www.afcoracing.com/products/getproduct.cfm

  ?CategoryID=3&ClassID=28&SubclassID=93&ProductID=1868

http://www.racerpartswholesale.com/bkfld.htm
http://www.easystreet.com/~porsche/2c.html
http://www.muller.net/karting/docs/technical/brfluid.html
http://www.diac.com/~cguy1/bmw/text/FAQ/FAQ.13.html
http://www.c-edge.com/shotimes/SHO3brakefluid.html
http://209.19.107.64/ogshell/loadpage.pl?676+catbrak.html


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