5.1 brake fluid

[T77911S]

what BF do you use. why not 5.1. It has higher boiling points.
why don't I see it in stores.

rebuilding the brakes on the 930.

[Bill Verburg]

Originally Posted by T77911S

what BF do you use. why not 5.1. It has higher boiling points.
why don't I see it in stores.

rebuilding the brakes on the 930.

The minimum standard for 5.1 is higher than the minimun for 4 but that doesn't mean that 5.1 is always better

DOT 4 and 5.1 are both glycol-based brake fluids they are compatible with each other, which means they can be readily mixed without harming your brake system. It is important never to mistake DOT 5.1 (glycol-based) with DOT 5 which is silicone-based and should never be mixed with any other DOT fluid.


here are some top fluid rated by wet boiling point

I use Motul RBF600 good fluid at a good price point, some cars w/ stressed brakes need the best available, others could get by w/ lesser fluids, My brakes are not particularly stressed and would be ok w/ ATE200

Castrol React SRF 4 518 608 Yes 33.8 2.07 69.99 https://www.google.com/#q=Castrol+SRF+brake+fluid&tbm=shop

Torque RT700 4 439 683 Yes 16.9 2.01 33.95 https://www.google.com/#q=Torque+RT700+brake+fluid&tbm=shop

Project Mu G-Four 335 4 430 635 NO 33.8 1.77 59.95 https://www.google.com/#q=PROJECT+MU+G-FOUR+335&tbm=shop Changes color when boiled

Endless RF 650 4 424 622 Yes 16.9 2.49 42.00 https://www.google.com/#q=Endless+RF650+brake+fluid&tbm=shop

Neo
Synthetics Super Dot 610 4 421 598 Yes 16 1.56 24.99 Super DOT Brake Fluid

AFCO HTX 4 421 618 Yes 16.9 1.18 19.99 https://www.google.com/#q=AFCO+HTX+brake+fluid&tbm=shop

Galfer Super DOT 5.1 5.1 419 572 Yes 16.9 0.83 13.99 FLUID DOT 5.1 motorcycle

Wilwood EXP n/a 417 626 Yes 16.9 1.05 17.69 http://www.tce************************/service-parts/

Comar GS610 4 417 626 Yes 16.9 0.89 15.11 https://www.google.com/#q=gs610+brake+fluid&tbm=shop

Maxima SYN High-Temp 4 410 600 Yes 12 1.25 14.95 Brake Fluid - Maxima Racing Oils motorcycle and auto

Bel-Ray Racing 4 410 580 Yes 12 1.25 14.99 https://www.google.com/#tbm=shop&q=Bel-Ray+racing+brake+fluid motorcycle

Motul RBF 600 4 401 594 Yes 16.9 1.06 17.99 https://www.google.com/#q=Motul+RBF+600+brake+fluid&tbm=shop

Gulf RF1000 4 401 617 Yes 16.9 1.06 17.96 Gulf Competition RF1000 racing brake fluid Not sold in U.S.

Gulf RF800 4 401 581 Yes 16.9 0.98 16.58 Gulf Competition RF800 racing brake fluid Not sold in U.S.

Ferodo Formula 4 401 590 * 16.9 "Track Day Brake Fluid"

Motul RBF 660 4 400 617 Yes 16.9 1.60 26.99 https://www.google.com/#q=Motul+RBF+660+brake+fluid&tbm=shop

TBM Brakes Xtreme 6 5.1 400 612 Yes 16.9 1.48 25.00 https://www.google.com/search?q=extreme6+brake+fluid mfr says wet boil is "over 400"
Formerly 'The Brake Man'

AP Racing Radi-Cal R3 4 399 617 Yes 16.9 1.78 30.00 https://www.google.com/#q=AP+Racing+PRF+brake+fluid&tbm=shop Use inhibitor with magnesium
parts. Formerly 'PRF660'

Brembo LCF 600+ 4 399 601 Yes 16.9 1.24 20.97 https://www.google.com/#q=Brembo+LCF+600+brake+fluid&tbm=shop Do not use with
magnesium parts

Pagid RBF 4 399 626 Yes 16.9 1.46 24.60 https://www.google.com/#q=pagid+RBF+brake+fluid&tbm=shop

AP Racing Radi-CAL R4 n/a 399 644 Yes 16.9 1.77 29.99 https://www.google.com/#tbm=shop&q=AP+Racing+R4+radi-cal+fluid

IPone X Trem 4 399 622 * 16.9 1.10 18.62 https://www.google.com/search?tbm=shop&tbm=shop&q=ipone+X+TREM+brake+fluid motorcycle

ATE Super Blue 4 396 536 Yes 33.8 http://www.ate-na.com/www/download/ate_us_en/themes/20_ate_brake_products/brake_fluid/download/safety_recall_notice_en.pdf US DOT: 'cease and desist'

Prospeed RS683 4 394 583 Yes 16.9 1.48 24.99 https://www.google.com/search?q=Prospeed+RS+683+brake+fluid&tbm=shop
yes/no is for mixing w/ other types

[Costa P]

Excellent overview by Bill.

I can add my 0.2 in the form of the following summary table which I used to shortlist my brake fluid choices:


FWIW.......I tracked my 930 and the combination of Castrol SRF + Pagid Orange RS4-4 gave me solid and reliable brakes on the track.

[DRACO A5OG]

+1 Endless RF650

[T77911S]

thanks bill.
you were not at all prepared for that question were you.

[T77911S]

went with rbf 600

here is a flud link

https://www.lelandwest.com/brake-fluid-comparison-chart.cfm

[911pcars]

Many motorcycle shops carry HD brake fluids. For example, my local shop has Motul RB600.

Sherwood

[T77911S]

$15 for 2 bottles and 10 shipping. said it should be here tomorrow. would like to get the brakes back on.

[RichardNew]

I wouldn't worry too much about high temperatures on the street. You're probably below 500-degree. The average street pad gives out at about 650 degrees. That's about the same point what the race pads just start to work properly.

If you're really worried about temperatures get a scan gun and check your temperatures.



You should change your fluid every two years. That's more important than the brand of fluid. For the street I pay more attention to the wet number than the dry number.

Costa P - How hot were the brakes on your track car? My rotor temps at Sebring get to about 1100º.

Richard Newton
Brake Temperature 101

[Costa P]

Originally Posted by RichardNew

Costa P - How hot were the brakes on your track car? My rotor temps at Sebring get to about 1100º.

Hi Richard. I have never measured the temps so I can't say how hot they got. But this combination of brake fluid and pads transformed my brakes to a level which provided me with total confidence. Fair enough my 930 was stock at the time and I'm hardly a "pro" driver, but I could do the full 20min practice sessions at Kyalami and never once sensed any degradation.

When I bought the car, it had OE pads and unknown brake fluid. The brake pedal got "mushy" on my first track day (Zwartkops raceway)!

I should add, that I have also removed the fog lights to help with airflow. Never got around to adding ducting though. That is still on the to-do list!