Suzuki AN400 Service Manual page 379

Parking Brake: 4D-4
Operation (Brake Pads are Worn → Braking → Automatic Adjuster Operate)
If braking when the brake pad being worn, the caliper piston/adjust nut move "A" until the clearance depended on
abrasion is done away.
The axial movement "B" is converted to rotary movement and acts on the adjust bolt and adjust-nut. Only the adjust-
bolt turns "C" because the caliper piston/adjust-nut is fixed to the brake pad with caliper piston groove and pad boss at
"D". Thus, the adjust-bolt keeps original position with rotating as well as the caliper piston/adjust-nut moves outside.
The adjust-bolt stops rotating once the brake pad-to-disc clearance become zero, so the automatic adjuster operation
is completed.
1
"D"
2
3
"B"
"A"
"C"
I705H1440013-04
1. Adjust bolt 2. Adjust nut 3. Adjust nut spring