NOTE: When servicing drum brakes, only dissemble and assemble
one side at a time, leaving the remaining side intact for reference.
- Inspect all parts for rust and damage.
- Measure the lining thickness. The minimum allowable thickness is 0.039 inch
(1.0mm). If the lining does not meet the minimum specification, replace it.
| Fig. 1: Using a ruler, measure the shoe lining thickness
|
| Fig. 2: There is a hole in the backing plate to inspect
the brake shoe lining thickness
|
NOTE: If one of the brake shoes needs to be replaced, replace
all the rear shoes in order to maintain even braking.
- Measure inside diameter of the drum as detailed in this Section.
- Place the shoe into the drum and check that the lining is in proper contact
with the drum's surface. If the contact is improper, repair the lining with
a brake shoe grinder or replace the shoe.
- To measure the clearance between brake shoe and parking brake lever, temporarily
install the parking brake and automatic adjusting levers onto the rear shoe,
using a new C-washer/shim. Replace the shim with the correct size, check the
chart. With a feeler gauge, measure the clearance between the shoe and the
lever. The clearance should be 0.013 inch (0.35mm). If the clearance is not
as specified, use a shim to adjust it. When the clearance is correct, stake
the C-washer with pliers.
| Fig. 3: Using a feeler gauge, measure the clearance
between the shoe and lever
|
| Fig. 4: C-washer/shims come in many sizes
|
| Fig. 5: Removing and installing a C-clip/shim
|
