[kropscamaro16]

i use motul but was told my local track shop to use the castrol srf its more expensive but lasts longer and no need to bleed as often

[TrackClub]

Originally Posted by Corbu

If the DOT4 is required for the track and it is also good for road driving, I wonder why GM doesn't fill it up with DOT 4 from the factory. Why they put in DOT3 to begin with? There must be a reason for this..

Yes: cost.

[Tachitup]

1/ Buy to bottles of Castrol SFR. It's expensive but why cheap-out with anything but the best.
2/ Use a turkey baster to empty the master reservoir.
3/ Starting bleeding at the front, then the rear. It will take 1.5+ bottles of SRF to properly bleed the entire system.
4/ You're good for a full 10 to 20 track events.

[GunMetalGrey]

How many track days or sessions should DOT 3 brake fluid last before it's changed?

[JeromeS13]

Originally Posted by GunMetalGrey

How many track days or sessions should DOT 3 brake fluid last before it's changed?

Zero.

Change it before the track event.

[mt.nichols]

I will also vouch for Castrol SRF. I swapped it in before the first event with my car and have had zero brake fade/pedal softening over the course of 5 track days in ~2 months.

[GunMetalGrey]

Originally Posted by JeromeS13

Zero.

Change it before the track event.

Why do you say zero? I don't doubt DOT 4 is far better, but zero?

Does GM recommend changing DOT 3 to DOT 4?

I'm just getting into tracking for the first time this year. Not a fast track, lots of corners.

[Norm Peterson]

I think OE mfrs are concerned with brake fluid viscosity - and how it might affect ABS and stability control calibrations.

Might not matter to a driver who's threshold-braking and puts stability control in a reduced sensitivity mode, turns it off, or doesn't have it to begin with.


Norm

[Mountain]

Originally Posted by Norm Peterson

I think OE mfrs are concerned with brake fluid viscosity - and how it might affect ABS and stability control calibrations.

Might not matter to a driver who's threshold-braking and puts stability control in a reduced sensitivity mode, turns it off, or doesn't have it to begin with.


Norm

Stoptech has a nice white paper on this somewhere.

[TJay74]

Originally Posted by GunMetalGrey

Why do you say zero? I don't doubt DOT 4 is far better, but zero?

Does GM recommend changing DOT 3 to DOT 4?

I'm just getting into tracking for the first time this year. Not a fast track, lots of corners.

GM track manual specifies to change out the DOT3 for DOT4 before the event, not after 1 session or after the event but before your event. If you dont heed that warning and try to run on the DOT3 then you cant complain about anything that happens.

Already had 1 member recently who stuck with DOT3 and cooked the fluid, he buried the nose of his car in the wall and is now crying to GM for the damages when it is all his fault for not following the track day setup guide.

[Badmojo]

I did three track days on stock fluid and then had an event that made me change it immediately. You can flush the stock fluid out sufficiently with one bottle of Castrol SRF. It is compatible with DOT 3, so you don't have to purge every last drop. You should also pull all four wheels off the car and check brakes and suspension before any track day, so just go ahead and do the fluid.

[GunMetalGrey]

Originally Posted by TJay74

GM track manual specifies to change out the DOT3 for DOT4 before the event, not after 1 session or after the event but before your event. If you dont heed that warning and try to run on the DOT3 then yyou cant complain about anything that happens.

Already had 1 member recently who stuck with DOT3 and cooked the fluid, he buried the nose of his car in the call and is now crying to GM for the damages when it is all his fault for not following the track day setup guide.

Where do you see that in the High Performance Owner's Manual? I can't seem to find it anywhere...
I'll still be changing the fluid since everyone seems to agree the manual says to and it makes a big difference.

[JeromeS13]

Originally Posted by GunMetalGrey

Where do you see that in the High Performance Owner's Manual? I can't find it anywhere...
(That doesn't mean I won't change it regardless to be on the safe side)

2018 Chevrolet Camaro Track Preparation Guide, Page 4:

https://my.chevrolet.com/content/dam...tion-guide.pdf

[Norm Peterson]

It's on page 4 in the Track Preparation Guide

DOT-4 Brake Fluid

For track events or competitive driving, it is recommended that the brake fluid be replaced with a high-performance brake fluid that has a dry boiling point greater than 279° C (543° F). After conversion to the high-performance brake fluid, follow the brake fluid service recommendations outlined by the fluid manufacturer. Do not use silicone or DOT-5 brake fluids.

Before every track event or competitive driving session

The above recommendation, especially in light of what Badmojo pointed out a couple of posts back, needs to be taken seriously if you're running any hotter than lunch time parade laps at roughly highway speeds. Being "over-prepared" in this respect sure beats being "not quite prepared enough".


Norm