BRAKE light under heavy acceleration

spearfish25 · 03-17-2010, 12:06 PM

Last weekend I bled my brakes and swapped back to my summer tires. Twice since then I've noticed the red "BRAKE" light illuminate under WOT acceleration. The car responds and handles perfectly fine, and I have the brake fluid reservoir filled to midway between Min and Max. From what the owner's manual says, the "BRAKE" light comes on either when the parking brake is engaged or there is low brake fluid. I'm going to reluctantly open up another bottle of RBF600 to top up the reservoir (I wanted to leave it half-way empty for my pad change in two weeks).

I'm guessing this is just the fluid sloshing to the back of the reservoir under WOT acceleration 'g's'. Has anyone else noticed this issue or had the light come on with anything less than a completely full brake fluid reservoir?

SoCal 370Z · 03-17-2010, 12:14 PM

Bet it's the fill level too.

vipor · 03-17-2010, 01:22 PM

First thing I thought it may be a TCS/ABS issue, but then I read the post.

ChrisSlicks · 03-17-2010, 01:40 PM

Happened to me last week. I had a small fluid leak after installing the Goodridge brake lines (I forgot to tighten one all the way as I was taking pictures). Took about a week for the fluid level to come down to the mid-way point and once that happened the brake light would illuminate under acceleration. If the brake light stays on for more than about 10 seconds the computer also disables VDC and traction control.

Ignore the Min mark, keep the fluid level at Max.

spearfish25 · 03-17-2010, 03:05 PM

Yep, seems fixed by filling back to Max. Like every other fluid in this car, Max means Must.

RCZ · 03-17-2010, 03:25 PM

beat me to it, this happened to me before too.

03-17-2010, 12:06 PM	#1 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	BRAKE light under heavy acceleration Last weekend I bled my brakes and swapped back to my summer tires. Twice since then I've noticed the red "BRAKE" light illuminate under WOT acceleration. The car responds and handles perfectly fine, and I have the brake fluid reservoir filled to midway between Min and Max. From what the owner's manual says, the "BRAKE" light comes on either when the parking brake is engaged or there is low brake fluid. I'm going to reluctantly open up another bottle of RBF600 to top up the reservoir (I wanted to leave it half-way empty for my pad change in two weeks). I'm guessing this is just the fluid sloshing to the back of the reservoir under WOT acceleration 'g's'. Has anyone else noticed this issue or had the light come on with anything less than a completely full brake fluid reservoir? __________________ 2013 Cadillac V-Wagon, RIP Z

03-17-2010, 12:14 PM	#2 (permalink)
SoCal 370Z A True Z Fanatic Join Date: Feb 2009 Location: US of A Posts: 2,842 Drives: Answers Rep Power: 33	Bet it's the fill level too. __________________ ( Click to show/hide ) Why I NEVER say NO to the Panda Lou Fusz!!!

03-17-2010, 01:22 PM	#3 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 41 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 48	First thing I thought it may be a TCS/ABS issue, but then I read the post. __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

03-17-2010, 01:40 PM	#4 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Happened to me last week. I had a small fluid leak after installing the Goodridge brake lines (I forgot to tighten one all the way as I was taking pictures). Took about a week for the fluid level to come down to the mid-way point and once that happened the brake light would illuminate under acceleration. If the brake light stays on for more than about 10 seconds the computer also disables VDC and traction control. Ignore the Min mark, keep the fluid level at Max. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

03-17-2010, 03:05 PM	#5 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Yep, seems fixed by filling back to Max. Like every other fluid in this car, Max means Must. __________________ 2013 Cadillac V-Wagon, RIP Z

03-17-2010, 03:25 PM	#6 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	beat me to it, this happened to me before too.

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