Temporary brake fluid temp management

[Clarkgti]

So cars been on first track day in over a year. Went great but I've noticed the pedal is quite long afterwards, presuming boiled the brake fluid.
I'm running ebc rp-1 pads with brembo discs and motul rbf660 fluid so quite surprised the fluid is what gave up. Its a golf gti with borderline acceptable brake caliper and disc size for its weight. I'm wondering if putting a duct to the caliper will prevent the fluid boiling for now? Not ideal obviously but maybe it will keep me out of trouble for now. Got another 3 track days coming up so just need to be about OK for now and I can grab a bbk during the winter then. Thoughts?

[SlimJim16v]

Yes, makes a noticeable difference. I converted my fog lights into intakes using bits from Demon Tweeks. I removed the hoses when not on track.

[brillomaster]

When was the brake fluid last changed? Did you manage to boil bottle fresh fluid?

[Clarkgti]

brillomaster said:

When was the brake fluid last changed? Did you manage to boil bottle fresh fluid?

Yeah fresh fluid. Changed to rbf660 about 8 weeks ago

[mko9]

If you have used this setup previously with no issues, then brake fluid is your most likely culprit. I suppose if your pads are getting a bit thin that could also be a contributing factor. If you went to a new circuit, then perhaps you are discovering the limits of your current setup.

At the risk of treating you like a newb, was the 'fresh fluid' from a previously open container, or from a brand new container? Just because it was still in the bottle rather than in your car, doesn't mean it hasn't been absorbing moisture.

I don't see any info on your car in your profile, maybe consult with a web forum dedicated to what you are tacking on track.

[Clarkgti]

mko9 said:

If you have used this setup previously with no issues, then brake fluid is your most likely culprit. I suppose if your pads are getting a bit thin that could also be a contributing factor. If you went to a new circuit, then perhaps you are discovering the limits of your current setup.

At the risk of treating you like a newb, was the 'fresh fluid' from a previously open container, or from a brand new container? Just because it was still in the bottle rather than in your car, doesn't mean it hasn't been absorbing moisture.

I don't see any info on your car in your profile, maybe consult with a web forum dedicated to what you are tacking on track.

No always use fresh stuff, I buy to use it, not to store. Yeah not a huge amount of dedicated stuff for these on track abuse to be fair. Seems like a bit of bodge ducting will suffice for now until winter upgrade budget comes in!

[Cambs_Stuart]

Ducting is generally a good idea for a car used on track. I've also seen a few people using titanium shims on the brake pads to help with heat management, but I've not idea how effective they are.

[alfa-alex]

Might be worth checking the hoses unless you’ve gone for braided already

Alex

[phazed]

What model GTi is yours?

I track a vRS, (same as a MK4 under the skin). I use standard callipers, Tarox discs, DS2500 pads and ATE Type 200 fluid.

Never any fade or spongy pedal even after 160 hard miles at Bedford.

I would change the fluid. Make sure all the old is removed.......