New IS300h owner

[YS2300]

Hey All,

I recently bought is300h. this is my first hybrid and today i noticed the sound when pressing the brake pedal twice. its coming from the brake pressure system. i believe it could be due to  regen but not sure. I would really appreciate if someone can help me

I tried uploading the video. i m not sure if it will work. but the sound is like electric motor turning on when i press the brake pedal. 

 

 

 

[steve2006]

Hello and welcome to the LOC.

Hybrids don’t have a conventional vacuum brake servo as the engine has to run to provide the vacuum.

The system uses a very high pressure nitrogen accumulator to supply the necessary brake pressure to conventional hydraulic brakes which in itself is a hybrid air and hydraulic system.

The noise you can hear is the motor pump recharging the accumulator after you have used the stored pressure pumping the pedal.

This system was also used on some GS300 models even though they were only petrol engines.

[YS2300]

@steve2006 Thank you so much for getting back and explaining. 
I currently don't have any waning lights on my dash. 

So does this mean this is normal then?

[DBIZO]

Sounds normal to me, I've got this periodic whirring sound after pressing the break. Can try and make an audio recording tomorrow.

[steve2006]

Yes sounds normal, if there is a fault and the pump runs too long it will flag a code.

[YS2300]

All of you are awesome. I'll be able to sleep peacefully tonight. 

so little bit about myself.  I'm from Canada and recently moved to London. I had Acura TSX (Honda Accord) in Canada and I was sad when i had to let her go. Drove CT200h here in the UK for few months. Nice car didnt have the soul and i continued to missed my Acura and then i finally came across IS300h. I m in love with this car.  

[DBIZO]

I recorded my break recharging sound, hope it's playable. 

New Recording 65.m4a

[YS2300]

Thank you @DBIZO for taking out the time to record and share this. Yup, thats exactly the same sound i hear in my car. Its all good then

The sound  just reminded me of SBC pump from w211 E Class when i first heard it. 

 

[steve2006]

Had it been a Mercedes pump the answer would probably not been a positive one 😀