Yamaha WR250F(R), Owner'S Service Manual

Page: 618 / 860

5 - 41
CHAS
FRONT BRAKE AND REAR BRAKE
Brake caliper piston seal kit
1. Remove:
• Dust seal
1
• Piston seal
2
NOTE:
Remove the piston seals and dust
seals by pushing them with a finger.
CAUTION:
Never attempt to pry out piston
seals and dust seals.
WARNING
Replace the piston seals and dust
seals whenever a caliper is disas-
sembled.
È
Front
É
Rear
È
É
EC5A4000
INSPECTION
Brake master cylinder
1. Inspect:
• Brake master cylinder inner
surface
a
Wear/scratches
→
Replace
master cylinder assembly.
Stains
→
Clean.
WARNING
Use only new brake fluid.
È
Front
É
Rear
É È
2. Inspect:
• Diaphragm
1
Crack/damage
→
Replace.
È
Front
É
Rear
É È
3. Inspect:
• Brake master cylinder piston
1
• Brake master cylinder cup
2
Wear/damage/score marks
→
Replace brake master cylinder
kit.
È
Front
É
Rear
È É
Kit de joint de piston d’étrier de frein
1. Déposer:
• Joint antipoussière
1
• Joint de piston
2
N.B.:
Déposer les joints de piston et antipous-
sière en les poussant avec le doigt.
ATTENTION:
Ne jamais chasser les joints de piston
et antipoussière hors du cylindre.
AVERTISSEMENT
Toujours changer les joints de piston
et antipoussière lors d’un démontage
d’étrier.
È
Avant
É
Arrière
CONTROLE
Maître-cylindre de frein
1. Contrôler:
• Surface interne du maître-cylin-
dre de frein
a
Usure/rayures
→
Remplacer
l’ensemble maître-cylindre.
Taches
→
Nettoyer.
AVERTISSEMENT
Utiliser uniquement du liquide de
frein neuf.
È
Avant
É
Arrière
2. Contrôler:
• Diaphragme
1
Craquelure/endommagement
→
Remplacer.
È
Avant
É
Arrière
3. Contrôler:
• Piston du maîgre-cylindre de
frein
1
• Coupelle de cylindre du maître-
cylindre de frein
2
Usure/endommagement/rayures
→
Remplacer kit de maître-cylin-
dre de frein.
È
Avant
É
Arrière
FREIN AVANT ET FREIN ARRIERE