energie8

I started to notice this crunching/crackling noise when I press on the brake pedal. The sound is the same regardless if I'm in park or driving and pressing the brakes to a stop. I just replaced my F and R brakes, and I checked for the sound and it was not coming from any corner, it's in the middle if you're sitting inside and the sound is coming from underneath the car. I just had my tranny fluid change (no flush) a few months ago too.

ibidu1

iTrader: (1)

Have someone press the brake while you carefully listen to where exactly it is coming from. Maybe you installed a shim incorrectly

Broncosi

I'm interested to see what you find out. Every time I let off my brake pedal, I hear a squeak and not sure what that is. Maybe it's the same issue.

energie8

tghw

Since you said it is not coming from the 4 corners, I would be inspecting the linkage between the brake pedal and the master cylinder.

ibidu1

iTrader: (1)

I would tear apart the front brakes and inspect everything, its possible you have a loose caliper bolt. It doesnt take long to disassemble the front brakes. I would also grease behind the pads, the slider pins, the pad tracks etc to make sure everything is operating smoothly.

energie8

Just did it, I also added some grease, checked all pins, clips, pads intact. Braking feels smooth and normal, I've been checking the progress on the rotors and it's fading evenly and smoothly, no shaking when I come to a stop off a highway exit.
We opened the hood as well and with the engine off, the clicking/grinding/crackling noise does not come from the master cylinder. I'm gonna try and hook up my action cam and record the noise and let you guys hear it.

ibidu1

iTrader: (1)

Good idea on the cam!

lukezen

ibidu1

iTrader: (1)

You could be right, if I remember correctly he has a hybrid. The brake actuator problems are on the gs460, 430, 450H, LS460. The 350's do not have these issues as its a totally different braking system.

On our 2010 LS460 even after replacing both the actuator and module, we would hear a crunching noise coming out of the engine bay.