Which brake fluid

[Ady_ftta]

Hi all,

I need to replace the brake fluid on my 2.5 after cooking it at Beford on a track day (my first ever) The car was fantastic, but the pedal feel is completely gone now.

I notice that a lot of people rate Motul RBL 600 or 660 (which I believe is dot 4) yet the manual states 5.1 (which was also recommended by Bespoke).

Is there any risk putting in dot 4 instead of 5.1. Which should I use / why?

Also how many litres will I need to do a change?

Thanks for your help.

[Defcon5]

A good 4 is better than a crap 5.1.

Super Blue, or SRF

[TuxMan]

AP racing 600 for me !!

[Ady_ftta]

Thanks guys - so you dont have to use 5.1 fluid, a good 4 will work well too?

I wasnt sure if a 5.1 had a different viscosity to 4, but I assume its temperature handling capability.

[RobP]

Handbook recommends Shell Advance Brake Plus 5.1 which I believe is used in many motorbikes. Has a wet boiling point of around 180C.
AP Racing Formula 5.1 is recommended for road and track and is used in the M600 (and costs about a fiver for 500ml from flea-bay). You can use AP 600 if you want (at about £18 for 500ml), but this is a full on racing fluid with a boiling point of around 200C and I believe is very hygroscopic so you'll have to replace it frequently to maintain performance.

[Ady_ftta]

Thanks guys - some useful info here.

Super Blue looks interesting - not least 'cos its blue so you can see when the new stuff has blead through.

[daddysumo]

Ady_ftta said:

Thanks guys - some useful info here.

Super Blue looks interesting - not least 'cos its blue so you can see when the new stuff has blead through.

I tried the Super Blue, it was ok but not as good as SRF or RBF 660 IMO.

[Ady_ftta]

daddysumo said:

I tried the Super Blue, it was ok but not as good as SRF or RBF 660 IMO.

Thanks - what mnade SRF or RBF660 that made them better?

[daddysumo]

Ady_ftta said:

daddysumo said:

I tried the Super Blue, it was ok but not as good as SRF or RBF 660 IMO.

Thanks - what mnade SRF or RBF660 that made them better?

The pedal felt 'wooden' under hard use with the blue...

[Jim O.]

Ady_ftta said:

Thanks guys - some useful info here.

Super Blue looks interesting - not least 'cos its blue so you can see when the new stuff has blead through.

ATE also has their Typ 200 brake fluid, which has the same specs as their Super Blue racing fluid, only it's amber in color. So, you can alternate between the two fluids, changing amber to blue on one flush, then going blue to amber on the next flush...