Brake Master Cylinder Reservoir Levels.

G'day Falcon, I've been reading your other thread about reversing the lines out of the master. I am just about to go from Rev1 brakes to Rev2 and braided lines. May have some questions for you on that.
  Re the observation of rising fluid level in the reservoir.  It has to be heat. Google has hits for this but usually with dragging brakes, which you've eliminated. So guessing now...perhaps the fluid does not cool at the same rate as the disk and caliper ??  Only other thing I can think of is that if the brake lines are touching the coolant hard pipes under the cabin ??

I'm of the opinion that the fluid level rise had nothing to do with heat as there was bugger all heat generated. That little drive was very gentle with absolute minimal braking to check for binding/dragging brake.
There are no coolant hoses close to hydraulic lines.
Wheel bearings are all new and all discs are brand new. I 've had a dial indicator on both sides of each disc. There is no runout detectable.
At the track I always try to do several cool down laps and after I come into the pits the car gets rolled along to let the disc cool out evenly for ten minutes or so. I've never used the handbrake at track.
Because of the "G" loadings on track I never fill the reservoir to the full mark but instead leave it about 4mm below to prevent spillage. Has always worked fine.
I am pleased to report that after a couple of track days at Morgan Park to bed in some new pads and then the drive to Canberra of about 1600km. the brakes feel great and I've not detected any variation in fluid level.
At Wakefield Park I gave the brakes a bloody good workout straight up to get rid of any build up from the road trip.
With quite good rubber on the ground I drove harder than I have ever done before. Would often here a tyre chirp but not sure where but suspect it was from a front. So I think the bias is very close for my level of ability.
Did over 300km on track and then about 1700km back home and fluid level went down about 3mm. Just as I would expect. On track it was generating a significant amount of brake dust on all four just as I would expect.

Yeah I have lots of problems that remain unexplained.
I love track time. Not near as quick as the other blokes but I get to go farther. More bang for bucks ??
That was over the two days on track.
Were you at the Nationals or Wakefield ?

Falcon, no I wasn't at Wakefield or Tassie.  I took my son to Wakefield a few months ago, for his first track experience.
Brakes are weak and wooden, hate the ABS (1990 SW20T import).
 & Redd,
that discussion about gravel piling up in front of the tyres...never heard of it before , wondering if it is a valid test of equal braking ? Seems like it could be....

Slightly more than one dog.
Gravel piled up in front of tyres was thunk up an patented by me 50 odd years ago. Initially perfected on English motorcycles which tended to either not brake much at all or lock either or both at different pressures on different days. You could gauge the success or otherwise by the degree of bark knocked off hands, yellbows. knees etc.
They then invented twin self energising leading shoe fronts. New experience. More bits of skin torn off.
Learnt a lot. Sold motorbike.
Happy to discuss your upgrade to the later model brakes. As you can see I have lots of experience. Just not all of it that wonderful. Part of the adventure.