brake booster

Pretty cool description of the noise. Wish other people were that detailed. And it's not so much the noise, but how often you hear the noise and every 17 second means it's time. Of course on Gen3, Toyota separated the booster into two different systems. So you have to decide which one to replace. It's a bit challenging of a job, and a used replacement is way cheaper than brand new.

 

You’ve posted in the right place. If you don’t have any trouble lights, and the brakes are fine, wait until you get lights.
Then you’ll be directed by the codes to diagnose and repair the correct problem

 

If it is doing this constantly it is worn out. It takes several minutes of running to throw a code. So it could last a few more months or longer if you are lucky.

Be careful with used parts as the housing numbers are not the part number. The pn changes based on factory wheel size and year. Since this is an important safety device, most spend a few more hundred and buy new. Best prices are usually the online Toyota dealers.

 

That's right. Auris/Corolla 2010-2018 hybrid, Prius 3gen, CT200h have common parts but calibrated differently on the brake booster.

 

Writing from the UK. In the UK we have RHD cars so the actuator is located at the right hand, since it is connected to the brake pedal and the booster on the left side of the bonnet, behind the HV coolant.

I had dash lights come on last year Feb 2024; could not reset the system and erase the code even though I unplugged the negative cable from the battery for like 30mins. I had a cheap obd device that could not read the code either. So I ended up using my breakdown cover from my insurance so they could tell me what was going on. They used their sophisticated scan tool and finally told me it was the brake booster. I told them to erase the code. Fortunately when the code got erased, my ABS started working as normal. Fast forward a year later, Feb 2025, after about 4000 miles, the dash light is back on.

I could not afford a brand new brake booster, as the Toyota dealer quoted £2300 (part number 47070-47060: the superseeded version replacing 47070-47050 and this does not include the accumulator) and that is for the part only. How could I afford that when used ones are between £150 - £250. So opted for used one.

To uninstall the one, I unplugged the negative cable from from the 12V battery and also unplugged the service plug from the HV battery. Began the uninstall and got stuck with the red brake hose leading to the actuator. I could not loosen the 10mm bolt, as it was stuck and I could not go ahead with the fix. So I had a gut feeling to put the vehicle back to its former state and put the vehicle back on, to prevent me stripping the bolt.

Initially the car came on and the lights came on with the alert. So I let the car to stay on for like 2 minutes and fortuantely the lights and alert went off and now the ABS is back to normal working state.

The questions still remain: for how long is this going to last this time around? Would there be a point where the system will no more be able to reset as the booster and actuator are totally fried? Could the booster and actuator be at their final life stages? Could this just be some electrical glitch?

I will update you as soon as I have any update.

 

It could fail at any time. When it does it is likely to be sudden and you will not have power brakes and stopping distances will be longer.

Used brake boosters are a gamble since there are at least two different per model year on your gen3. The Prius wagon versions are different as well. However the housing numbers are the same. In the US knowing the donor car is the same model and tire size increases your chances.

 

It is a brake system and if you have no clue, better to ask mechanics to check everything. No leak, firm brake, no codes are the minimum requirement