240 DL Sedan, 150K miles

The cars makes all types of creaking noises, so I’m not sure how long this *problem* has existed.

Basically, I here a single clunk every time I apply the brakes regardless of speed. The clunk does not continue as long as I don’t take my foot off the brake. And the car does not pull to one side or another while braking.

If I pumped the brakes, I would get the clunk every time I hit the brake peddle. Yet it does not happen if the brake peddle is hit when the car is at rest.

I also just noticed that it did not seem to happen when I backed up in a parking lot. Curious I went to a safe area of the parking lot and experimented. If I went forward and put the car in neutral, then the clunk occurred, as expected, every time I hit the brake peddle.

However, if I go backward, put the car in neutral and coasted, then it sometimes happened on the first tap of the brake peddle, but did not happen on subsequent taps on the brake peddle.

I tried this a few times just to assure the above was correct.

It’s unclear where the noise is coming from. It sounds like the rear, but then again possible the front.

The front brakes, rotors, calipers are all new, the rear brake pads are old, but good.

Any thoughts on what might be causing this clunk?