PIGMENTED NOISE INSULATOR FOR BRAKE PAD
A shim for a disc brake shoe incorporates a metal plate coated on both sides with an elastomer such as nitrile rubber. One elastomeric layer is coated with a pressure sensitive adhesive which facilitates attaching the shim to a brake pad. The other elastomeric layer is coated with a pigmented polyester or epoxy layer which is intended to match the color of the car.
1 . A brake shim comprising:
a central metal layer having first and second sides;
first and second elastomeric layers adhered to said first and second sides respectively; and
an outer pigmented layer adhered to said second elastomeric layer.
2 . The brake shim claimed in claim 1 wherein said pigmented layer is a polyester layer.
3 . The method claimed in claim 1 wherein said pigmented layer includes polytetrafloroethylene.
4 . The brake shim claimed in claim 1 further comprising a pressure sensitive adhesive layer covered with a release sheet on said first elastomeric layer.
5 . The shim claimed in claim 1 wherein said metal layer has a thickness of 0.4 mm to about 0.8 mm.
6 . The shim claimed in claim 1 wherein said elastomeric layers have a thickness of about 0.05 mm to about 0.12 mm each.
7 . The shim claimed in claim 3 wherein said pigmented layer is one of a polyester and an epoxy.
8 . The shim claimed in claim 1 wherein said elastomeric layers are nitrile rubber.
9 . The shim claimed in claim 1 wherein said elastomeric layers are acrylic rubber.
10 . The shim claimed in claim 3 further including a plurality of clips.