odd brake noise when stopping
Senior Member
Joined: 04-06-2020
Posts: 1,054
From: Missouri
So, bringing this up, as it might help someone else. Found the issue with the brakes. Everything was assembled right, greased and set right. The issue was the drum. I got draybestos and delco drums. I ordered the rays but found out they would take 30 days. Didn't want to wait, so i got the delcos. Missed return date for rays, so had to keep them.
anyways, I installed the ac delco drums. Turns out the drums were not cut down properly. On the inside of the drum, along the outer edge, there is a ridge. Delco didn't grind this down far enough. So, what happened as the brakes applied, as you all know, the shoes move. Well, they would smack against that little ridge and make the noise. Slapped on the raybestos drums, problem gone.
So, the issue were the drums not being ground down all the way The inside of the delco drums were also very rough, not on shoe surface, but the inside face. The rays were not like that. So, there you go, bad drums.
anyways, I installed the ac delco drums. Turns out the drums were not cut down properly. On the inside of the drum, along the outer edge, there is a ridge. Delco didn't grind this down far enough. So, what happened as the brakes applied, as you all know, the shoes move. Well, they would smack against that little ridge and make the noise. Slapped on the raybestos drums, problem gone.
So, the issue were the drums not being ground down all the way The inside of the delco drums were also very rough, not on shoe surface, but the inside face. The rays were not like that. So, there you go, bad drums.
Senior Member
Joined: 04-06-2020
Posts: 1,054
From: Missouri
as stated, inside the drums , only the pad surfaces and anywhere the hub/lugs surfaces make contact will be machined, the rest ( inside and outside surfaces will remain cast ) doesnt matter if rotors or drums, only the contact surfaces are machined. And I know this....because I used to make them.
Moderator
Joined: 01-23-2009
Posts: 26,536
From: Fredericksburg,VA
It was the "contact surface" he was talking about. Only a used drum would have a ridge on the outer edge. The inner edge might have a bit because the cutting tool can't get there. Obviously the outside and flat is not machined. I didn't make them, but I've seen my share. Just my agenda.
On the inside of the drum, along the outer edge, there is a ridge
Senior Member
Joined: 12-05-2014
Posts: 3,370
From: Northern Ohio
When I read the OP, I was immediately sure the drum was running out. If the drum is perfect, that means either it's not seated correctly or the hub is bent. Does it fit tightly on the center hub? Too tightly? Rust on the hub?
If none of the above, then prolly a bad drum. Much easier to check TIR on disk than a drum I think.
Ptetty easy to check TIR on the hub face tho. I would do that.
If none of the above, then prolly a bad drum. Much easier to check TIR on disk than a drum I think.
Ptetty easy to check TIR on the hub face tho. I would do that.
Member
Joined: 08-10-2020
Posts: 54
From: Richmond,VA
2006 was first year. I bought one used and it has had a fair amt of problems. Violated one of my rules of life by buying the first year of a new model. But I did own a 1961 Buick with a small aluminum V* that I drove the wheels off without a hitch. GM engineers put out a model with extensive "testing", but testing and ownership are two different animals. Enjoy fooling with HGHRs, they don't make them any more yet parts are not hard to find.
