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Old 09-30-2013, 10:14 PM   #1
sycraft
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Pentosin Super DOT 4 Brake Fluid

http://www.pentosin.net/f_brakefluid.asp

I recently switched to this fluid and have been imprerssed so far, excellent pedal feel....
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Old 09-30-2013, 11:36 PM   #2
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With a wet boil of under 340 degrees it is an average brake fluid.

Brembo LCF600 Wet: 204C (399F)
MOTUL RBF600 Wet: 216C (421F)
CASTROL SRF Wet: 270C (518F)

It is best to buy brake fluid by wet boil temp.
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Old 10-01-2013, 06:34 AM   #3
sycraft
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thanks, did not know that, that was the only DOT 4 fluid in my small town. Will have to find some better fluid elsewhere.
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Old 10-01-2013, 06:42 AM   #4
menendez1293
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Quote:
Originally Posted by JusticePete View Post
With a wet boil of under 340 degrees it is an average brake fluid.

Brembo LCF600 Wet: 204C (399F)
MOTUL RBF600 Wet: 216C (421F)
CASTROL SRF Wet: 270C (518F)

It is best to buy brake fluid by wet boil temp.
Hey Justice Pete what brake fluid would you recommend for normal street driving with very little aggressive use? I was planning on flushing the whole system in November/December so am looking at my options.
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Old 10-01-2013, 06:48 AM   #5
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found this

DOT 3 VS. DOT 4 and 5.1
AFCO's 570 brake fluid is a DOT 3 type fluid. However, it has a dry boiling point that is 52 higher than DOT 5.1 specifications, 124 higher than DOT 4 specifications and 169 higher than DOT 3 specifications. AFCO's 570 fluid meets or exceeds all DOT 3, 4, and 5.1 lubrication, corrosion protection and viscosity specifications.

WET VS. DRY BOILING POINT
The term boiling point when used regarding [COLOR=blue !important][COLOR=blue !important]brake[/COLOR][/COLOR] fluid means the temperatures that brake fluid will begin to boil.

WET BOILING POINT
The minimum temperatures that brake fluids will begin to boil when the brake system contains 3% water by volume of the system.

DRY BOILING POINT
The temperatures that brake fluid will boil with no water present in the system.

MOISTURE IN THE BRAKE SYSTEM
Water/moisture can be found in nearly all [COLOR=blue !important][COLOR=blue !important]brake [COLOR=blue !important]systems[/COLOR][/COLOR][/COLOR]. Moisture enters the brake system in several ways. One of the more common ways is from using old or pre-opened fluid. Keep in mind, that brake fluid draws in moisture from the surrounding air. Tightly sealing brake fluid bottles and not storing them for long periods of time will help keep moisture out. When changing or bleeding brake fluid always replace [COLOR=blue !important][COLOR=blue !important]master [COLOR=blue !important]cylinder[/COLOR][/COLOR][/COLOR] caps as soon as possible to prevent moisture from entering into the master cylinder. Condensation, (small moisture droplets) can form in lines and calipers. As caliper and line temperatures heat up and then cool repeatedly, condensation occurs, leaving behind an increase in moisture/water. Over time the moisture becomes trapped in the internal sections of calipers, lines, master cylinders, etc. When this water reaches 212 F the water turns to steam. Many times air in the brake system is a result of water that has turned to steam. The build up of steam will create air pressure in the system, sometimes to the point that enough pressure is created to push caliper pistons into the [COLOR=blue !important][COLOR=blue !important]brake [COLOR=blue !important]pad[/COLOR][/COLOR][/COLOR]. This will create brake drag as the rotor and pads make contact and can also create more heat in the system. Diffusion is another way in that water/moisture may enter the system.

Diffusion occurs when over time moisture enters through rubber [COLOR=blue !important][COLOR=blue !important]brake [COLOR=blue !important]hoses[/COLOR][/COLOR][/COLOR]. The use of hoses made from EPDM materials (Ethlene-Propylene-Diene-Materials) will reduce the amount of diffusion OR use steel braided brake hose with a non-rubber sleeve (usually Teflon) to greatly reduce the diffusion process.

THINGS TO REMEMBER
  • Brake fluids dry boiling point is more important then wet boiling point when used in a [COLOR=blue !important][COLOR=blue !important]racing [COLOR=blue !important]brake[/COLOR][/COLOR][/COLOR] system.
  • Passenger cars very rarely will undergo a brake fluid change making the wet boiling point more important.
  • Racing brake system fluid is changed often and a system with fresh fluid will most likely not contain water.
  • Because of this, racers should be concerned with the dry boiling point.
  • Racing fluid exceeds DOT 3, 4, and 5.1 dry boiling point specifications.
  • Never use silicone based fluids in racing brake systems.
  • Using racing brake fluid will increase performance of the braking system.
  • Never reuse fluid. Never mix types or brands of brake fluid.
  • Use smaller fluid containers that can be used quicker.
  • If fluid remains in container be sure to tightly seal and do not store for long periods of time.
  • Purge system (complete drain) and replace fluid often.
Below list provided by "The ultimate brake fluid comparison chart" (I would like to add more to this).

Passenger cars very rarely will undergo a brake fluid change making the wet boiling point more important.

Racing brake system fluid is changed often and a system with fresh fluid will most likely not contain water Because of this, racers should be concerned with the dry boiling point.


Arranged by Dry L
  • 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:527F -- WET:302F --- AP RACING 551 ($12.95/0.5L OR 16.9 OZ)
  • DRY:527F -- WET:347F --- VALVOLINE SYNPOWER DOT3 & DOT4
  • DRY:536F -- WET:392F --- ATE SUPERBLUE/TYP200 ($9.95/1L)
  • DRY:543F -- WET:349F --- Endless The truth DOT 4 ($35/1L)
  • DRY:550F -- WET:284F --- PERFORMANCE Friction Z rated ($6.27/16 OZ)
  • DRY:550F -- WET:284F --- FORD HEAVY DUTY DOT 3 ($4/12 OZ)
  • DRY:570F -- WET:284F --- WILWOOD 570 ($5.65/12 OZ)
  • DRY:572F -- WET:284F --- US Brake/AFCO Racing 570 Gold
  • DRY:572F -- WET:421F --- US Brake/AFCO Racing Ultra HTX
  • DRY:577F -- WET:300F --- Brake Man
  • DRY:585F -- WET:421F --- Earl's Hypertemp 421
  • DRY:590F -- WET:410F --- AP RACING Super 600 ($16.95/0.5L OR 16.9 OZ)
  • DRY:593F -- WET:420F --- MOTUL RBF600 ($12.95/0.5L OR 16.9 OZ)
  • DRY:590F -- WET:518F --- CASTROL SRF ($69.00/1L 0R 33.8 OZ)
  • DRY:601F -- WET:399F --- BREMBO LCF 600 PLUS ($26.75/0.5L OR 16.9 OZ)
  • DRY:610F -- WET:421F --- NEO SYNTHETICS SUPER DOT 610($11.95/12 OZ)
  • DRY:610F -- WET:421F --- PROSPEED GS610 ($39.95/16 OZ)
  • DRY:617F -- WET:413F --- Endless RF-450 ($45/1L)
  • DRY:620F -- WET:425F --- COBALT SUPER XRF [seem to no longer be available]
  • DRY:622F -- WET:424F --- Endless RF-650
  • DRY:626F -- WET:417F --- WILWOOD EXP 600 ($16.95/0.5L 16.9 OZ)

Arranged by wet boiling point:
  • DRY:401F -- WET:284F --- DOT3 MINIMUM
  • DRY:550F -- WET:284F --- PERFORMANCE Friction Z rated
  • DRY:550F -- WET:284F --- FORD HEAVY DUTY DOT 3
  • DRY:570F -- WET:284F --- WILWOOD 570
  • DRY:572F -- WET:284F --- US Brake / AFCO Racing 570 Gold
  • DRY:577F -- WET:300F --- Brake Man
  • DRY:527F -- WET:302F --- AP RACING 551
  • DRY:446F -- WET:311F --- DOT4 MINIMUM
  • DRY:527F -- WET:347F --- VALVOLINE SYNPOWER DOT3 & DOT4
  • DRY:543F -- WET:349F --- Endless The truth DOT 4
  • DRY:500F -- WET:356F --- DOT5.1 MINIMUM (GLYCOL BASE)
  • DRY:500F -- WET:356F --- DOT5 MINIMUM (SILICONE BASE)
  • DRY:536F -- WET:392F --- ATE SUPERBLUE/TYP200
  • DRY:601F -- WET:399F --- BREMBO LCF 600 PLUS
  • DRY:590F -- WET:410F --- AP RACING Super 600
  • DRY:617F -- WET:413F --- Endless RF-450
  • DRY:626F -- WET:417F --- WILWOOD EXP 600
  • DRY:572F -- WET:421F --- US Brake/AFCO Racing Ultra HTX
  • DRY:585F -- WET:421F --- Earl's Hypertemp 421
  • DRY:593F -- WET:420F --- MOTUL RBF600
  • DRY:610F -- WET:421F --- NEO SYNTHETICS SUPER DOT 610
  • DRY:610F -- WET:421F --- PROSPEED GS610
  • DRY:622F -- WET:424F --- Endless RF-650
  • DRY:620F -- WET:425F --- COBALT SUPER XRF [seem to no longer be available]
  • DRY:590F -- WET:518F --- CASTROL SRF
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