View Full Version : TRW Lucas GP600 Racing Brake Fluid

11th February 2009, 07:11 PM

Lucas Grand Prix 600 Racing Brake Fluid!

Unlike other RBF600's Lucas is backward compatible with the lower DOT fluids, so if you get stuck needing to fill up with other fluid, it won't have any adverse effects, other than lower its performance...

TRW GP600 Dot 4 Racing Brake Fluid
Dry - Min 310
Wet - Min 204

That's about the best out there short of Castrol SRF, or GS610. But significantly cheaper than either of them at $65 for a 1L bottle.

For comparison, some other popular brands:
Motul Dot 5.1
270 dry
185 wet

Castrol Response Super Dot 4
286 dry
184 wet

30th March 2009, 03:05 PM
sorry i might be really dumb bbut what is the wet and dry number refering too? sorry for the noob question :)

30th March 2009, 03:11 PM
Wet and dry refers to the amount of moisture that the fluid has absorbed. 'Dry' refers to 0% water, whilst 'wet' refers to 2% moisture absorbtion. Pretty much all Dot 4 brake fluid, whether it's high performance (like an RBF) or normal street fluid will go 'wet' after between 6-12 months.

That's why replacing fluid regularly is more important that buying super duper pads as you can see the massive difference 'wet' makes to fluid performance.

Also, need to update that, the 1L bottle is now $65... still miles cheaper than SRF at $130/L....

30th March 2009, 03:14 PM
Have a squiz here:

I'm sure out standard for wet is only 2% (not 3.7%), but I could be wrong... either way wet is no more than 12 months of regular use.

30th March 2009, 09:58 PM
oh so its boiling point? :)

thanks for the heads up :)

30th March 2009, 11:12 PM
silicone based?

31st March 2009, 09:45 AM
silicone based?
No, so it's fine for street use, and fine to mix with existing brake fluid (ie. don't need to flush system out completely before use).