2023 GX 460 brake locking
Lead Lap
Joined: Nov 2013
Posts: 4,245
Likes: 1,198
From: IL
Historical note: When the brakes were drum (not disc) design all around, a "self adjusting" feature was included that was
operated by driving in reverse a bit faster than usual and applying the brakes a bit more firmly than usual.
operated by driving in reverse a bit faster than usual and applying the brakes a bit more firmly than usual.
Pole Position
Joined: Jan 2019
Posts: 2,633
Likes: 1,393
From: WA
Racer
Joined: Feb 2006
Posts: 1,501
Likes: 77
From: Northern VA
I purchased a 2023 GX 460 new two years ago. Whenever I go to the carwash and come home and park the vehicle the right rear brake locks up. It takes about 5 hours for the brake locking to occur. To unlock it, I have to put the vehicle in drive and then step on the accelerator. I have to really give it some gas and then I get a very loud boom from the right rear brake as it unlocks. I always have to make sure I have a clear runway in front of me to account for the vehicle lurching forward. This model does not have an electronic auto emergency brake. It is manual. No other brakes lock up other than the right rear.
For two years the dealer says they have tried to diagnose the problem but they have no idea why it does this. No service bulletins or recalls on this problem. The service manager said it was normal. They even installed a new caliper. Same problem.
Any Ideas on what to do??
For two years the dealer says they have tried to diagnose the problem but they have no idea why it does this. No service bulletins or recalls on this problem. The service manager said it was normal. They even installed a new caliper. Same problem.
Any Ideas on what to do??
Is it below freezing where you are? My LS430 ebrake will seize even when dry if below freezing…car is parked on an inclined driveway, so applying a little gas releases it. When I lived in Central NY state, it was common practice not to use the ebrake in winter, as it’s almost guaranteed to seize overnight.
Pole Position
Joined: Jan 2019
Posts: 2,633
Likes: 1,393
From: WA
... in 50-years of driving have seldom used the e-Brake on an automatic transmission vehicle ... only if parking on a steep road (with tire turned to the curb) or a steep incline where a curb is not present. Using every single time one parks is roll-away paranoia.
Lexus procedure is to back off the brake pad star adjuster 8-notches for free wheel movement from the seated (wheel locked) position. Backing off two (2) additional notches provides adequate clearance to address the above issue ... while maintaining plenty of pedal travel for proper engagement. Per my post above, if flash rust causes the described issue ... backing off the shoes is perfectly fine as long as pedal travel / shoe adjustment / brake engagement is verified.
Lexus procedure is to back off the brake pad star adjuster 8-notches for free wheel movement from the seated (wheel locked) position. Backing off two (2) additional notches provides adequate clearance to address the above issue ... while maintaining plenty of pedal travel for proper engagement. Per my post above, if flash rust causes the described issue ... backing off the shoes is perfectly fine as long as pedal travel / shoe adjustment / brake engagement is verified.
Last edited by ASE; Jan 11, 2026 at 09:16 AM.
Moderator
Joined: Sep 2009
Posts: 3,914
Likes: 227
From: Alabama
Since my dealer could not figure out the problem over the past two years, I call Lexus Corporate Office. They said their was nothing else to be done. I told them they should be embarrassed by their response.
Today I went to an independent family owned repair shop outside Tampa called "Toy House." They only repair Toyota and Lexus vehicles and have been there since 1976. I described the issue and they knew what it was right away. As it turned out it was the Emergency Parking Brake (not the brake caliper) inside the right rear wheel was adjusted too tight. So when it got wet and sat overnight the drum surface corrosion would fill up the space between the shoe and the drum. Consequently, the shoe would stick inside the drum. The left rear wheel was adjusted correctly and had no issues. So the mechanic pulled both wheels and adjusted both rear emergency brakes equally with more gap between the shoe and drum. Only took 1 hour. Problem solved!!
I called Lexus Corporate back and explained the solution and how disappointed I was in them. They gave me a $500.00 credit at the dealer for parts/service. I am just so glad it is fixed.
Today I went to an independent family owned repair shop outside Tampa called "Toy House." They only repair Toyota and Lexus vehicles and have been there since 1976. I described the issue and they knew what it was right away. As it turned out it was the Emergency Parking Brake (not the brake caliper) inside the right rear wheel was adjusted too tight. So when it got wet and sat overnight the drum surface corrosion would fill up the space between the shoe and the drum. Consequently, the shoe would stick inside the drum. The left rear wheel was adjusted correctly and had no issues. So the mechanic pulled both wheels and adjusted both rear emergency brakes equally with more gap between the shoe and drum. Only took 1 hour. Problem solved!!
I called Lexus Corporate back and explained the solution and how disappointed I was in them. They gave me a $500.00 credit at the dealer for parts/service. I am just so glad it is fixed.
Thanks for sharing your experience and solution - great information! Decent response from Lexus after the fact although it is embarrassing and concerning that Lexus initially refused to help you. Brake issues are not trivial and can sometimes turn into something very serious.
Pit Crew
Joined: May 2025
Posts: 171
Likes: 21
The car wash is exactly 7/10 of a mile from my house. I thought of the same thing so after the car wash I started driving about 5 MI around the area using my brakes frequently. Sometimes that will eliminate the break from seizing up but in many instances it still does. I am thinking that the rotor may get surface rust on it overnight which adheres to the pads. It is odd though that it only happens on the right rear brake and the other three are perfectly fine.
Racer
Joined: Aug 2018
Posts: 1,596
Likes: 453
From: il
the required amount of movement at the wheel is max constrained by the design and with correct dimension parts the pedal travel will be plenty as long as the cable is adjusted correctly and the position setup is followed with the adjustment wheel
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