sport cali fluid seepage bleeder nut

Zxces50

Day two Session 3&4- Did back to back HPDE 3 then lined up in pit and went right back out HPDE 2- ~ 40 minutes, NJ Motorsports park- 2 Mile , 10 turn, Sunny 93-95 F-
In paddock noticed some brake fluid (maybe 10-15 drops) ran down side of stock sport cali (both fronts not rear- also same amount both fronts) started at bleeder nut but could not really tell if via threads of bleeder "hole"- very very small amount - this is track season two / 10 track days completed- did a back/back at Watkins Glen but did not have this occur. Absolutley NO change in braking, pedal feel, stopping power on track. Resevior same level - did not seem excessively hot.

"Leak" ran straight down cali-ie not wind blown thinking may have occurred just after when I entered paddocked/ finished session??

Hesitant to just tighten bleeder nut as did not happen any previous time and I have not bleed recently so that should have changed. Thinking maybe heat expansion of alum cali different than bleeder nut so got some seepage. Anybody see this before??

Running- HP + pads, ATE Super Blue, SS Lines -
The stock rotors do have a blueish tint so I gotem hot

ChrisSlicks

Hmm Lightning course? Lightning isn't typically that hard on brakes. Was just there last week.

Could be just the heat expansion like you said, the caliper temperature can increase during pit in with no moving air. I vaguely remember this happening to someone else with stock brakes.

Do a precautionary bleed and it should be good.

The blueish tint is from the crappy pads

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cossie1600

My friend lost his car going into T1 when he either locked up or suffered a mechanical problem going into T1 on Saturday, I am not sure if it was the car or the track.

ChrisSlicks

One of the people I was running with lost it into T1 as well. It was driver error in his case, got into the dirt and over-corrected sending him across the otherside of the track. He scrubbed a lot of speed before he hit the tire wall fortunately so the damage wasn't too severe and his was able to fix his car and get running again.

T1 is the hardest braking zone, you're going from 130 down to 75, T7 your going from 115 to 60. The rest of the time you're not using the brakes that much so they have lots of cool down time.

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cossie1600

Judging from the video I saw, the car might have had the EBD kicked on at the wrong time and broke the balance of the vehicle. It really makes me want to quit track days when I see things like that as even the best driver can eat the wall.

Not trying to jack the thread, but do you guys get the side to side sway at the track with your brakes?

ChrisSlicks

If you get into the ABS it can pull a little bit left and right. A found that this is much more pronounced on street tires as you can lock them up easier.

My main problem is locking up the rear brakes and the rear starts dancing around on me.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

spearfish25

I've had this happen to me with my sport calipers a number of times. There are two theories. 1) the bleeder nipple/screw needs to be tightened a bit more. Once I tightened mine another 1/16 to 1/8 of a turn, no more leaking. 2) fluid is trapped in the top of the nipple when bleeding and then stays there (it's like a little cup since the screw faces upwards). Once you get the brakes nice and hot, it boils out the top of the nipple and runs down the caliper. In any event, it doesn't impact braking or brake fluid levels. So, no worries.

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Zxces50

this seems to make sense- both sides had exact same "leak" amount and looked like happened when sitting still in paddock. Will bleed and tighten appropriately - may even shop vac out the top of nipple when done to get it dry. All good - the glen in september

ChrisSlicks

I usually just hit the nipple with some brake cleaner to remove any left overs.

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Zxces50

swapped out my pads today - checked the bleeder nuts- was able to give them an easy 1/8 of a turn more- so problem solved. Bleed them too but checked nut first