Re: [Amc-list] Needed AMC American Front Brake Drums for 9" x 2" Brakest

[Tom Jennings <tomj@xxxxxxx>]

> 1. Just to make sure, the following part numbers are all correct for the
> FRONT drums on a 1963 Rambler American with 9" X 2" brakes?
>
> RAY 2501, 2501R, ACDELCO 18B512, NAPA UP6401106, UP6401217, TS4401105,
>  TS4401238, UP6401218, UP6401238

Yup.


>
> 2. Rock Auto only lists the 2501/2501R brake drum for the REAR and I need
> the FRONT. Are they correct for the front?

THe 195.6 cars allegedly got 2" wide, the 232 got 2.5" wide.

The ONE THING that will tell you what width shoes belong on those backing 
plates is the "anchor" top and center above the wheel cylinder. When a shoe 
sits on the backing plate, the arced end of the shoe rests on the anchor. 
If you put 2.5" shoes on a 2" backing plate, the shoe arc end sits at the 
tip of the anchor, instead of centered.

The wheel cylinder is the same; a 15/16" (example) wheel cyl for 2" brakes 
sits lower on the backing plate than one for 2.5". The brake shoe should 
sit squarely on the face of the wheel cyl piston (bendix) or the little 
slotted footsie thing (wagner) should be straight out.


> 4. The BD2502 have a concave center to which the front hub mounts and
> they  do seat all the way. The original drums have a convex center (with
> respect  to the shape of the drum) and that make up the 1/2 inch
> difference. The  BD2502's do not make contact with the backing plate,
> even though they are  1/2" deeper.

The 9" brakes all use the same hub; the concave vs. convex is required for 
that.

9" brakes I know really well at this point (for what that's worth)! I even 
have some junk parts to measure if you get stuck.

_______________________________________________
Amc-list mailing list
Amc-list@xxxxxxxxxxxx
http://www.amc-list.com/mailman/listinfo/amc-list