Brake Fluid Comparison Chart

Comparison Torque RT700™, Castrol SRF, Endless RF-650, Motul RBF* & StopTech Brake Fluids

DOT 4 Min Standard

Torque RT700™

Castrol SRF

Endless RF-650

Motul RBF600*

Motul RBF660*

StopTech STR-600

StopTech STR-660

Dry Boiling Point (°C)
(as per mfr’s specs)
230 °C 362 °C 310 °C 323 °C 312 °C 325 °C 312 °C 328 °C

Dry Boiling Point (°C)
(as per lab testing)
N/A 363 °C 324 °C 324 °C
299 °C

309 °C
N/A N/A

Wet Boiling Point (°C)
(as per mfr’s specs)
155 °C 226 °C 269 °C 218 °C 205 °C 205 °C 206 °C 206 °C

Wet Boiling Point (°C)
(as per lab testing)
N/A 226 °C 280 °C 211 °C
206 °C
204 °C Minimum Wet Boiling Point 195 °C Minimum Wet Boiling Point 195 °C

High Temperature Stability
(Boiling Point Change)
±5.4 + 1 ° that original BP exceeds 437 °F -1 °F -3.5 °F -3.5 °F
-7.2 °F
-3.5 °F N/A N/A

Chemical Stability
(Boiling Point Change)
±5.4 + 1 ° that original BP exceeds 437 °F -1.23 °F -3.6 °F -3 °F -2 °F -3 °F N/A N/A

Vapor Pressure
N/A <0.01 mmHg @ 68 °F N/A N/A N/A N/A N/A N/A

Density (Specific Gravity)
N/A 1.095 N/A N/A N/A N/A N/A N/A

pH
(7 = Neutral)
7.0 - 11.5 7.3 9.1
5.7
7.1
6.8

Viscosity -40 °F (cSt)
1800 max 1501 1202
2543
1660 1434 N/A N/A

Viscosity 212 °F (cSt)
1.5 min 2.1 3.5 3.5 2.7 2.7 N/A N/A

Compressibility
No standard
5.19E-05 @ 212 °F @ 5800 psi (400 bar)

6.487E-05 @ 212 °F @ 5800 psi (400 bar)

5.868E-05 @ 212 °F @ 5800 psi (400 bar)

N/A

N/A
N/A N/A

(Numerically lower numbers denote lessor compressibility)

3.969E-05 @ 122 °F @ 5800 psi (400 bar)

5.230E-05 @ 122 °F @ 5800 psi (400 bar)

4.884E-05 @ 122 °F @ 5800 psi (400 bar)

N/A

N/A
N/A N/A

3.405E-05 @ 68 °F @ 5800 psi (400 bar)

4.621E-05 @ 68 °F @ 5800 psi (400 bar)

4.846E-05 @ 68 °F @ 5800 psi (400 bar)

N/A

N/A
N/A N/A

Reserve Alkalinity
No standard 84 10 5 33 36 N/A N/A

% H2O Content at Testing
No standard 0.01 0.01 0.15 0.19 0.22 N/A N/A

Red indicates where the brake fluid did not meet the SAE J1704 and/or FMVSS 116 requirements.
Yellow indicates where brake fluid did not meet the manufacturer’s performance claims

*While we have only listed Motul RBF600 and RBF660 the performance characterisitics are applicable to a large number of other brands of fluids as they all come from one manufacturer.

Source: http://www.torquebrakefluid.com/compare_torque_rt700_to_other_brake_fluids.html