I put new rotors (NAPA) and pads (Motorcraft) on the rear of my Supercrew on Tuesday and all seemed well until yesterday. I exited the freeway and came to a stop at the light. Right as I was almost stopped, I heard a low pitch "growling" noise from the rear brakes. It didn't do this until yesterday after I'd been on the road for about 2 hours. I took the truck out this morning and could not get the brakes to make a sound until I'd driven for roughly 15 minutes of stop-and-go city driving. Still, they only made the noise when I was creeping to a stop and at no other time did I hear any sound. This leads me to believe that heat has something to do with it. Mind you this is not a typical squealing noise, it has a much deeper tone. I applied some anti-sqeal goo to the back of the pads before installation and did some hard braking afterwards to get them to seat properly. They have also been bled. Any ideas on what my problem could be?

While I'm on the topic, I have one more question. I have a pressure bleeder at home and attempetd to bled the brakes with it, but there seemed to be a small plastic floating piece inside the master cylinder that prevented the bleeder from functioning properly. Is there some sort of trick to using a pressure bleeder on these trucks? Any help is greatly appreciated.

-Craig

 

have had pads with hard spots in them. Almost like small metal particles . You get to spot with a spot like that and in makes an almost metallic groan. Can generally feel it in the pedal a little bit also. The plastic piece in the master is to decrease the surface area of fluid that is exposed to air. It can be removed when bleeding and then replaced afterwards.

 

From your post, I presume both sides are making that noise?

If I was a betting man, I'd say it would probably go away in a week or so. If it doesn't, or gets worse, you might have gotten cheap "bum" pads or rotors...