Checking The Front Brake Caliper; Assembling The Front Brake Calipers - Yamaha YFM70RY Service Manual

TIP
Before disassembling the brake caliper, drain
the brake fluid from the entire brake system.
1. Remove:
• Brake caliper pistons
• Brake caliper dust seals "1"
• Brake caliper piston seals "2"
2
1
M MMM M MMM M M MMM M
a. Blow compressed air into the brake hose joint
opening "a" to force out the pistons from the
brake caliper.
EWA13550
WARNING
• Cover the brake caliper piston with a rag.
Be careful not to get injured when the pis-
ton is expelled from the brake caliper.
• Never try to pry out the brake caliper pis-
ton.
b. Remove the brake caliper dust seal and
brake caliper piston seal.
L LLL L LLL L L LLL L
EAS22380

CHECKING THE FRONT BRAKE CALIPER

The following procedure applies to both of the
brake calipers.
Recommended brake component replace-
ment schedule
Brake pads
Piston seals, dust
seals
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
If necessary
Every two years
Recommended brake component replace-
Brake hoses
Brake fluid
1. Check:
• Brake caliper pistons "1"
Rust/scratches/wear → Replace the brake
caliper pistons.
• Brake caliper cylinders "2"
Scratches/wear → Replace the brake caliper
assembly.
• Brake caliper body "3"
Cracks/damage → Replace the brake caliper
assembly.
• Brake fluid delivery passages
MMM
(brake caliper body)
Obstruction → Blow out with compressed air.
1
EWA1S3L005
WARNING
Whenever a brake caliper is disassembled,
replace the brake caliper piston seals and
dust seals.
EAS22410
ASSEMBLING THE FRONT BRAKE
CALIPERS
The following procedure applies to both of the
brake calipers.
EWA1S3L006
LLL
WARNING
• Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
• Never use solvents on internal brake com-
ponents as they will cause the piston seals
to swell and distort.
• Whenever a brake caliper is disassembled,
replace the brake caliper piston seals and
dust seals.
4-24
FRONT BRAKES
ment schedule
Every four years
Every two years and
whenever the brake
is disassembled
2
2
1
3