jray3
Posts: 1375
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Brake System Glitch

Wed Jan 29, 2014 4:32 pm

Yesterday my brake warning light came on along with the warning sound. :? It's a high-pitched continuous electronic whine that I hadn't heard before. Anyway, no perceptible change in braking behavior, friction, handbrake or regen, brake fluid reservoir is nice n full, and the warning went away when I restarted the car. Conditions were chilly and wet, SOC 80%.
Anyone else experience this?
2012 i-SE "MR BEAN" 76,000 miles
i-ES traded at 21,648 miles
2000 Honda Odyssey
1987 F250 Diesel
1983 Grumman Kurbwatt,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh
1965 Karmann Ghia Cabriolet

PV1
Site Moderator
Posts: 2874
Joined: Fri Apr 27, 2012 4:22 pm
Location: Pittsburgh, PA
Contact: Website

Re: Brake System Glitch

Wed Jan 29, 2014 7:13 pm

Was it below freezing? Sounds like something was keeping vacuum from reaching the sensor, or the brake pump wasn't kicking on. If you can pump the brake pedal fast enough, you can re-create this warning because the brake system runs low on vacuum.

Could easily have been a software glitch since it went away after a restart. Way back when, I had a relay clicking like crazy after starting the car, and was loosely related to if the car was putting out power or regenning. After a restart, it quit, though every once in a while it will still click on then off, but always when starting out from a stop when it does it.

This morning, the thermometer at the house said -7 F, though it felt much colder (never checked what the car said). I noticed the brakes were really stiff, but no warnings. The car also had some trouble locking into Park. The lever went to the P, but struggled to settle into the final position.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

2017 Bolt EV LT in Orange with QC - 7/31/2017

Driving electric since 2-21-2013.

jray3
Posts: 1375
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Brake System Glitch

Wed Jan 29, 2014 11:18 pm

PV1 wrote:Was it below freezing? Sounds like something was keeping vacuum from reaching the sensor, or the brake pump wasn't kicking on.

Nope, twas over freezing, and this happened a good 15 minutes into my morning commute, also after preheat (not that preheat would help vacuum lines) It could have been some ice that dislodged in a line. We have had very humid, foggy conditions with overnight freezes.
2012 i-SE "MR BEAN" 76,000 miles
i-ES traded at 21,648 miles
2000 Honda Odyssey
1987 F250 Diesel
1983 Grumman Kurbwatt,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh
1965 Karmann Ghia Cabriolet

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