Hey there all!
Around a few months ago, I picked up a '07 460 with around 130k miles. One owner, but maintenance records are a bit spotty. I'm assuming the infamous brake actuator has not been replaced.

After I had put around 1k miles on the car, I've started to notice a squawking while braking. Specifically, under hard braking, or when I'm at a stop, and reduce pressure on the pedal. If it's held at a constant pressure, it never squawks. I was initially worried, but just brushed it off as just something needing to be greased. It's been that way for around 2k miles, with no other symptoms.

However, I've recently had some other braking behavior. What I initially assumed were warped rotors (slight vibration under braking), has progressed into other things. When stopping it's fine, however once I get below 10-ish mph I feel a jitter in the brake pedal. Feels a bit like ABS kicking in. At this point, I'm starting to worry I'll see those codes and lights associated with a bad actuator pop up, but I'm hoping it might just be warped rotors and me overthinking.

What are y'alls thoughts? Is a squawking a symptom of the actuator, or just clicks/pops?

 

Usually dash lights come on for abs issues. Do have an OBD2 scan done for codes. Without hearing the noise, hard to say. It could be just warped rotors.

 

I think I have the same problem with my '07 LS460. I scanned my car with an OBD2 and it shows C1247, a stroke sensor code. I'm not too educated on cars, but I saw a couple videos of people replacing something near the brake pedal.

 

Scanned it with a generic OBD2 scanner, and no codes.

Trying to pinpoint the noise is a bit difficult solo, it's hard to tell if it's inside the car or out. Honestly, sounds more like it's coming from the front left caliper itself, but I could be wrong on that. The thing that's throwing me off is it's only when the pedal is moving. I would think if it's the actuator, that holding the pedal down would cause the noise. It's only when I release the pedal do I hear it.

Brake fluid level looks good. In a few weeks I'm planning on replacing the rotors/pads all around, might throw in a brake flush for good measure.

 

Living in Virginia with humidity, a brake flush is highly recommended. Coolant flush reminder as well. At least have the coolant tested. While at the shop, have a professional code scan done. Generic scanners only show very basic codes. This is a computer centric car.