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06-14-2017, 10:04 PM
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#1 |
 Drives: 2013 ZL1 Join Date: Mar 2017
Location: MI
Posts: 31
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Brake and clutch issues after track night
So long story short, because of a looming rain storm i only got in 55mins of track time in tonight 2x20mins and 1x15mins for the last session. each session had 20mins in between, after the last session which was 15mins, i shut down my zl1 and gave it ~5mins to cool off before driving home. As i went to stop at the exit the pedal went to the floor, i got some abs but barely stopped before rolling out into the main road. clutch at the same time was stuck at the floor with about 1" of travel for the entire pedal. i gave it a few minutes, pumped both pedals several times and everything was fine. i had no noticeable brake fade on the track. . .so what gives? should i not let the car sit? should i let it sit for longer if im going to shut it down?
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06-15-2017, 09:44 AM
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#2 |
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corner barstool sitter
Drives: 08 Mustang GT, 19 WRX Join Date: Jul 2012
Location: Eastern Time Zone
Posts: 6,990
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 dunno, never had that happen.But FWIW I always drive around unoccupied sections of paddock or on the access roads for a few minutes after pit-in to help cool things off a little further than you get with half a "cool-down" lap. Norm
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'08 GT coupe 5M (the occasional track toy)
'19 WRX 6M (the family sedan . . . seriously)  |
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06-15-2017, 11:39 AM
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#3 | |
 Drives: 2010 Camaro 2SS/RS Join Date: Oct 2014
Location: Redmond, WA
Posts: 239
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Quote:
Scott
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"The Beast" 2010 Camaro SS/RS LS3
Diablo T1000 with Phastek custom tune, K&N Intake, Hurst Short-Throw Shifter, Flowmaster, Outlaw II Exhaust, BMR 1" Lowering Springs, BMR 3-way Adjustable Anti-Roll Bars, BMR End Links and Reinforcement Brackets, BMR Trailing Arms, ZL1 wheels, Nitto NT555 G2 Tires, Z28-style Rear Spoiler, Hawk Plus Brake Pads, Motul RBF600 Brake Fluid  |
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06-15-2017, 01:39 PM
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#4 |
          Drives: cars Join Date: May 2011
Location: Oversneeze
Posts: 4,542
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Bleed the fluid with a race capable DOT 4, 99% bet your problem is solved. How old was it and what fluid is in it?
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06-15-2017, 02:54 PM
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#5 | |
 
Drives: 2013 1le 2ss rs black Join Date: Jun 2016
Location: North Java
Posts: 90
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Quote:
I think this also, talked with guys doing tech last weekend. They have failed new cars before less than 1000 miles for too much moisture in fluid. BMW club recommends changing fluid 1month prior to events Sent from my iPhone using Tapatalk |
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06-15-2017, 09:22 PM
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#6 |
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,824
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fluid most likely boiled so upgrade the fluid to a Motul 600 or equivalent and see how it performs. My bet is it will be perfect and the pedal will be a non issue.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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06-15-2017, 09:59 PM
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#7 |
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Drives: 2013 ZL1 Join Date: Mar 2017
Location: MI
Posts: 31
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Thanks everyone. I had suspicions i boiled the brake fluid, it's dot3 with about 5k miles as far as I kno. Thought it was odd it happened after I got off the track. I plan to have brake fluid changed to Castrol SRF and have ss lines installed before the next event. That was scary enough trying to stop from 20mph.
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06-15-2017, 10:42 PM
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#8 |
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Drives: cars Join Date: May 2011
Location: Oversneeze
Posts: 4,542
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DOT 3 on a road course is a death wish waiting to happen. Even your owners manual says to remove it and those things never get anything right. Be happy it happened where it did and not on the end of a high speed straight. I change mine either every or every other event depending on how hard I run it. Some say overkill but I've never had a single problem and it's cheap insurance when you consider what your car and your life is worth.
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06-15-2017, 11:17 PM
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#9 |
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KaBoom1701
Drives: 13' ZL1 Red M6 Join Date: Dec 2012
Location: I.E. SoCal (Yucaipa)
Posts: 8,631
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Motul RBF 600.....problem solved.
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Mods:
Roto-Fab Intake, WW Res. kit & Big Gulp Air Scoop, Elite Catch Can, ATI Super Damper & 18% OD Pulley, LF Idler pulley bracket, Metco CC breather, ID850 Injectors, Stainless Power Headers w/ ceramic coating, TR71X Spark Plugs, JMS Fuel Pump Booster, Bo White TB, Tuned by Ted @ Jannetty Racing, Ron Davis HX, D3 Reservoir, Pfadt 1" Springs, Moreno Camber Plates, ZL1 Addons Splitter guard washers, Tow Hook kit & rock guards, Hurst Shifter Billet Plus 6 Speed Short Shifter, ZL1 DRL lighting harness, ZL1 Recaro Seats. |
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06-16-2017, 08:10 AM
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#10 |
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corner barstool sitter
Drives: 08 Mustang GT, 19 WRX Join Date: Jul 2012
Location: Eastern Time Zone
Posts: 6,990
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Even with RBF600, I'd still do at least a couple minutes of slow speed driving immediately after pit-in just to keep a little airflow going through the rotors and around the calipers instead of just letting everything heat-soak.
Norm
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'08 GT coupe 5M (the occasional track toy)
'19 WRX 6M (the family sedan . . . seriously) |
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06-16-2017, 10:12 AM
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#11 |
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Drives: cars Join Date: May 2011
Location: Oversneeze
Posts: 4,542
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I agree Norm and do the same. Lets the coolers do their thing and gets air across the hot bits before stopping. Although with my oversized everything its mostly just for brakes now since fluid temps stay chilly.
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