2024 Toyota Sienna Hybrid Brake Bleeding Procedure
- Thread starter iCurious
- Start date
If it were a 2nd gen Prius you could brick it by bleeding the rear axle! Seriously, the car can sense the lack of residual brake pressure and not let itself out of Park. Can't speak for your Sienna but your caution is warranted. Have also bled a 19 and a 21 Prius successfully.
You can get a J2534 dongle on ebay for <$40 and rent/activate Techstream for three days pretty cheap. You'd want an old 32 bit laptop (Win Xp- win 7 years.)
You can get a J2534 dongle on ebay for <$40 and rent/activate Techstream for three days pretty cheap. You'd want an old 32 bit laptop (Win Xp- win 7 years.)
Bleeding procedure is the same as other cars. But you should disconnect the 12V battery when doing it. That's required for my Lexus UX hybrid, so it's probably required for your Toyota. My Corvette requires it too. Apparently there can be fault codes if the battery is connected during the brake bleeding.
Disconnecting the 12V battery and pumping the brakes like a standard car on a 2024 Toyota Sienna (XL40 platform) will lock up the actuator, trigger a Christmas tree of dash lights, and likely fail to bleed the rear lines entirely /
It's like any other hybrid Toyota product. Install a battery maintainer and follow the air bleeding procedure using the scan tool.
what would be the complete procedure? and which scan tools are capable of this?
would like to know as I am thinking of getting a Toyota/Lexus Hybrid.
I think OP is confusing bleeding with flushing.
For a brake flush, you don’t need to follow the bleeding procedure b cause you’re not getting the air out, just pushing the old fluid with the new one.
For a brake flush, you don’t need to follow the bleeding procedure b cause you’re not getting the air out, just pushing the old fluid with the new one.
Is it possible to do it without a scan tool? I heard the car care nut said you cannot bleed brakes on the hybrid the same as ICE vehicles.
There is a procedure for bleeding without a scan tool but it's kind of a pain. Never tried it. It is a brake by wire system. The procedure depends on the vehicle but it generally involves bleeding the fronts conventionally but the rears are done via the ABS pump.
Ok. This sounds similar to the previous Lexus models.
The bleeding procedure, if similar to Prius, involves using scan tool or a copy of TechStream to tell the brake modules to bleed. It is kind of pain in the butt for DIY.
I would search the Sienna or other similar forums for the exact detail procedure.
I would search the Sienna or other similar forums for the exact detail procedure.
I did mine a couple months ago. No scan tool and didn't disconnect the battery. Put the keys in the house. Open the drivers side door and leave it open. I used a drain bottle with a check valve so I can do it myself. Did the RR,LR,RF then the LF. Used about 32 oz total. Pushed the brake pedal slowly and when I felt resistance I took my foot off and repeated until clear fluid came out. Brakes feel great.
The rear brakes did you do pump and hold or just hold and ABS will do the pumping?
The Prius, using the scan tool, has someone in the driver's seat touch the brake pedal then the ABS pumps out the ports at a medium rate. I believe the pedal just acts as an on/off switch for the computer to do its thing. Since there's no direct hydraulic connection to the rear axle, I don't know how it can "feel better" when done.
I can tell from the tone of your writing you want to do this without a scan tool or Techstream. Don't. Do some web exploring and figure out how to get and use Techstream for a few days for cheaper than you think.
Last time I did it on a hybrid, it was a 2025 Camry. Used a Thinkcar Thinkdiag 2. There is a way to do this without Techstream or a scan tool by pulling relays for the ABS modulator and bleeding the fronts conventionally, then using the brake actuator to bleed the rears. Not advised. The Techstream/GTS procedure will disable the ECB system, pump down the accumulator and then it will first ask you to bleed the fronts. Then it will ask you to bleed the rears and then it will perform a fluid supply “refresh” and a linear offset valve offset. This must be done with the parking brake off and ideally the car is on a battery maintainer. On the newer cars, this Camry for example, I needed to unplug the battery sensor or the car will turn off and go to sleep during the process. I almost had to get it towed to the dealer but found out about that.