Brake fluid

Post by **Ash.Z** » Sat Apr 27, 2013 9:37 pm

Evening,
I returned home from a track day a few weeks ago and when moving the car around I notice there is air in the brake lines. This is something that seems to happen every time with my car. I know the brakes get a real hammering and a bit if air is understandable, but this is a lot. I was thinking of changing the fluid for either AP551 or Ferodo super formula. Does anyone have experience of running higher temp fluid and which might be best? Also how much does a 4th with the ABS unit still in place hold? One last thing, to change the fluid , do I drain resevoir and then top up as I bleed or bleed everything out then refil and bleed through?
Thanks Ash.

Post by **Merlin** » Sat Apr 27, 2013 9:51 pm

What fluid are you using now? Are you loosing any fluid? You have braided hoses installed already?

I have been using Castrol React Performance Dot 4 (Formerly Response Super DOT 4) Synthetic Brake Fluid http://www.opieoils.co.uk/p-742-castrol ... fluid.aspx which is meant to be Dry Boiling Point 280ºC /Wet Boiling Point 190ºC with no problems.

Most other people I hear running more extreme fluid is the Motul RBF 600 racing brake fluid http://www.opieoils.co.uk/p-894-motul-r ... fluid.aspx . But I think you need to change that every year.

Both of them are Super DOT 4. http://www.opieoils.co.uk/pdfs/tech-art ... fluids.pdf

Post by **Ash.Z** » Sat Apr 27, 2013 9:59 pm

Thanks Merlin, I have braided hose. I'm not exactly sure of the fluid in it at the mo, my local garage normally sort it for me, but I think they must just be using regular fluid as after every track time there is a lot of air in the system. No visible leaks.
I do cook the pads though so temperature is a major factor.

Post by **Merlin** » Sat Apr 27, 2013 10:04 pm

Yeah that doesnt sound good for days days on the track.

What pads are you using?

Post by **Ash.Z** » Sat Apr 27, 2013 10:08 pm

I did have DS2500, which went volcanic after the last session 18 months ago. So this time I tried EBC redstuff, not examined yet but should have held up better. I'll need to switch between the two brands, Ferodo for sprints and a more ceramic for track days.

Post by **Merlin** » Sat Apr 27, 2013 10:11 pm

What was the Red Stuff like?

Post by **Ash.Z** » Sat Apr 27, 2013 10:16 pm

It did need warming up, but bit well locking up at times. Ok for track day but not if you want start to finish braking.

Post by **Ash.Z** » Sun Apr 28, 2013 8:08 pm

Any ideas on quantities?

toyracer69 · Post by **toyracer69** » Tue Apr 30, 2013 10:53 am

If it was me, braided lines, RBF600 and DS2500's all round. I used to use this type of set up on my car before I went Big Brakes.....

Post by **Merlin** » Tue Apr 30, 2013 10:55 am

That is the same level of spec I use, just different brands.

@Ash.Z You'll need 2L of brake fluid, that will be plenty and you can use the excess to change your clutch fluid