This video will show you how I replaced the rear brakes pads on a Lexus RX350 with the electronic parking brake feature. At first I was a little confused. Using my caliper piston compression tool, the caliper piston just wouldn’t budge! After doing a little research, learned that there’s a screw or piston inside the electronic parking brake motor that applies pressure to the caliper piston when energized and relieves the pressure when there’s no current; that when deactivated, the parking brake screw does not retract away from the caliper piston. To get the screw to retract, 12v dc opposite polarity current must be applied to the electrical contact point. This is the workaround not having a bi-directional scan tool with software that can command the parking brake motor screw to retract for brake pad replacement service. After full retraction, the caliper piston can be compressed back into the caliper.
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Parts & Specialty Tools:
Dual Piston Caliper Compressor Tool:
https://amzn.to/2TBOkWV
Cigarette Lighter Plug Extension Cable With Small Alligator Clips
https://amzn.to/3ghqYj7
Schumacher 12V AC to DC Power Converter
https://amzn.to/2ZDykHx
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Not enough stock grease
will a obd computer retract the piston?
Should not fast forward, those are steps we need to see, useless video.
Not sure if your year is applicable, but newer models (2020+) have a mode to retract the parking brake inside the car, have to press a combo of the park brake button
You better off bringing it to a professional brake shop. Attempted it with a 12v booster and it didn’t work.
Jus open 2 screws of the motor retract your self
Did you need a special caliper piston retractable tool? Thank you
Up here in the rust belt I highly recommend removing the guide pins completely, clean them, clean the hole and then grease and reinstall..salt finds its way in and causes them to drag/seize causing the uneven wear you see here.
Aren't you supposed to put it in service mode?
No you don't just take the motor off lol
Super helpful thxs for taking the time to video and sharing. The 12v trick for retracting the ebrake was right on. TY
Never use anti-seize on brake pins.