Brake Master Cylinder making squeaking noise

[comandershark]

Hello Guys i own a Lexus GS 300 2001 Facelift.

Everytime when i start the car after it cooled down it starts making squeaking noises for about a minute and stops. It only happens when the car was cold before. For example when i drive and make a stop for 1-3 hours it is not happening.

I searched for the problem but the videos i watched the guys had the lights on my doesn't. 

Maybe somone knows how to fix it by myself without buying a new brake masyter cylinder assembly.

I added a video with the noise.

 

Edited June 25, 2023 by comandershark

[comandershark]

 

[RX400h]

Are you sure it's not coming from the engine bay?

[comandershark]

7 hours ago, RX400h said:

Are you sure it's not coming from the engine bay?

I made another video and it is coming from the cylinder in the back.

[RX400h]

Do you have a mechanic's stethoscope? You can get one at Harbor Freight at a low price. It will come in handy to pinpoint the source of the sound.

[Bykfixer]

Sounds like a servo or something (ABS module) moving back and forth. Maybe boosting pressure to the brake line(s) that loses pressure when the car sits long periods. 
 

https://www.repairsmith.com/blog/abs-module/

[dcfish]

I had a 98 GS300 FOR 225000 Miles, I went through 3 Master/ABS cylinders, I think there is a subject on using a brake booster from a SC430  Check into that.

[Elijah_STRA]

I have a 05 gs430 that has the exact same issue. Comes from the master cylinder, pressing the brake a few times usually stops it. Other than that I think when someone did the brakes they just didn’t bleed them correct. Going to get a new cylinder, and bleed the brakes again. Hopefully that works…?