Does anyone here use DOT5 on their clutch system ?? if so does it make any difference with the silicone additive thats in DOT5. Just wondering.

Thanks in advanced..

silicone brake fluid (DOT 5) generally has a higher boiling point than 3/4 and the best part is it will not eat your paint! Keep in mind that there is a range of dry/wet boiling temps between the DOT 3's and 4's (within the same) and of course there is synthetics too. Had a nice chart somewhere, but think it's at home of all the various fluids' brands and their data.

However, you need to get every single last bit of DOT 3/4/5.1 out of there, since DOT 5 is not compatible and will cause issues.

IMO, there is really not much need to go to DOT 5 other than the non-eating of paint...There is some good DOT 4 out there and esp. synthetic.

Ok, i am putting a new slave and master cyliner on the car, and at work we have the dot5, but we also carry this willwood 600 plus brand, its seems to be equivalent to dot4, but not sure if its synthetic.

I'd avoid dot5. I've bled that stuff and it seems way more tedious then 5.1,4,3.

This isn't the chart I was referring to, but a quick google search yielded this below (keep in mind the $ is ~2006 so I'm sure it's gone up + I'd bet there are some not listed)

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

Quoting MellowVR4:
Does anyone here use DOT5 on their clutch system ?? if so does it make any difference with the silicone additive thats in DOT5. Just wondering.

Thanks in advanced..



Why DOT5? Do you expect your clutch fuild to boil over?

i was just wondering if it made any difference.

If you have tons of the DOT 5 lay around than sure why not use it in the clutch hyd system. But you are going out to buy a qt of DOT5 just for the clutch system I don't see the point. Clutch fluid doesn't get as hot a brake fluid.

The only real benefit to DOT 5 is that it does not absorb water. It is used primarily for older, classic or collector cars that are not driven but spend most of their time in storage. It is not really recommended for a regular driver.

Ok, thanks for the advice guys.