2012 RX 350 or RX450H
Racer
Joined: Mar 2011
Posts: 1,817
Likes: 229
From: wa
OK, on Toyota hybrids brake system has no connection between brake pedal and brakes. You have brake pedal, it is connected to what is called brake stroke simulator, what gives you brake pedal feel. Thereafter, it all electric. COMPUTER decides how much hydraulic force to apply to the brakes via brake accumulator and actuator. You simply tell it if you want more or less stopping power, then ECM decides how to do it.
Hybrid brakes are tuned to utilize 80% of braking via regenerative - which is, basically, engine braking, sort off, when engine is used as counter mass for motor generator then operating as generator and any demand above that is then done by hydraulics. This is why some hybrids end with brake pads lasting so long. They are simply less used. Though not all, my rear pads on TCH had to be replaced at 45 000 miles. But shnookwhaler at TN still runs on original pads - and over 264 000 miles on odo.
Hybrid brakes are tuned to utilize 80% of braking via regenerative - which is, basically, engine braking, sort off, when engine is used as counter mass for motor generator then operating as generator and any demand above that is then done by hydraulics. This is why some hybrids end with brake pads lasting so long. They are simply less used. Though not all, my rear pads on TCH had to be replaced at 45 000 miles. But shnookwhaler at TN still runs on original pads - and over 264 000 miles on odo.
Instructor
Joined: Oct 2016
Posts: 857
Likes: 47
From: Oregon
Can you provide a reference for this? This is not what I've read.
My understanding is that the braking system on my 2010 RX450h is utterly conventional except for the first 10% or so of pedal travel, where the computer uses the front and rear motor/generators as generators and the electricity generated goes into the hybrid battery.
My understanding is that the braking system on my 2010 RX450h is utterly conventional except for the first 10% or so of pedal travel, where the computer uses the front and rear motor/generators as generators and the electricity generated goes into the hybrid battery.
Lexus Champion
Joined: Feb 2004
Posts: 1,973
Likes: 55
From: Ohio
Brake pedal has to be a part of the physical hydraulic connection. Otherwise it wouldn't pass through federal safety requirements.
While moving at a safe location, press on the brake pedal and then put the gear lever into N position. Regen braking will disengage and you'll be left off with hydraulics only.
An old trick for the 1st Gen Honda Insight was to amplify the hydraulic pressure sensor reading to get more supplemented regen braking.
While moving at a safe location, press on the brake pedal and then put the gear lever into N position. Regen braking will disengage and you'll be left off with hydraulics only.
An old trick for the 1st Gen Honda Insight was to amplify the hydraulic pressure sensor reading to get more supplemented regen braking.
Pole Position
Joined: Aug 2013
Posts: 2,634
Likes: 256
From: CA
On my CT200h there is a "B" mode similar to the Toyo Pruis. I use it for extended down hill cruise as the "B" mode generates more electricity to recharge the hybrid batteries vs otherwise. I wished that is in the RX450h, but not there.
Still the brake pad wear is an indication of how that Hybrid car was driven. Early pad replacement = driven hard/abuse and if I were looking for a used Toyota/Lexus Hybrid, then I'll pass that one and keep looking.
Still the brake pad wear is an indication of how that Hybrid car was driven. Early pad replacement = driven hard/abuse and if I were looking for a used Toyota/Lexus Hybrid, then I'll pass that one and keep looking.
OK, on Toyota hybrids brake system has no connection between brake pedal and brakes. You have brake pedal, it is connected to what is called brake stroke simulator, what gives you brake pedal feel. Thereafter, it all electric. COMPUTER decides how much hydraulic force to apply to the brakes via brake accumulator and actuator. You simply tell it if you want more or less stopping power, then ECM decides how to do it.
Hybrid brakes are tuned to utilize 80% of braking via regenerative - which is, basically, engine braking, sort off, when engine is used as counter mass for motor generator then operating as generator and any demand above that is then done by hydraulics. This is why some hybrids end with brake pads lasting so long. They are simply less used. Though not all, my rear pads on TCH had to be replaced at 45 000 miles. But shnookwhaler at TN still runs on original pads - and over 264 000 miles on odo.
Hybrid brakes are tuned to utilize 80% of braking via regenerative - which is, basically, engine braking, sort off, when engine is used as counter mass for motor generator then operating as generator and any demand above that is then done by hydraulics. This is why some hybrids end with brake pads lasting so long. They are simply less used. Though not all, my rear pads on TCH had to be replaced at 45 000 miles. But shnookwhaler at TN still runs on original pads - and over 264 000 miles on odo.
Last edited by lexusrus; Aug 15, 2017 at 08:31 AM.
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