HYOSUNG Aquil GV650, Service Manual

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◉ BRAKES
Complaint Symptom and possible causes Remedy
Poor braking
(FRONT and REAR) 1. Not enough brake fluid in the reservoir.
2. Air trapped in brake fluid circuit.
3. Pads worn down.
4. Too much play on brake lever or pedal.
5. Oil adhesion on friction surface of pads.
6. Worn disk. Refill to level mark.
Bleed air out.
Replace.
Adjust.
Clean disk and pads.
Replace.
Insufficient brake
power. 1. Leakage of brake fluid from hydraulic system.
2. Worn pads.
3. Oil adhesion of engaging surface of pads.
4. Worn disk.
5. Air in hydraulic system. Repair or replace.
Replace.
Clean disk and pads.
Replace.
Bleed air.
Brake squeaking. 1. Carbon adhesion on pad surface.
2. Tilted pad.
3. Damaged wheel bearing.
4. Loosen front-wheel axle or rear-wheel axle.
5. Worn pads.
6. Foreign material in brake fluid.
7. Clogged return port of master cylinder.
Repair surface with
sandpaper.
Modify pad fitting.
Replace.
Tighten to specified torque.
Replace.
Replace brake fluid.
Disassemble and clean
master cylinder.
Leakage of brake
fluid. 1. Insufficient tightening of connection joints.
2. Cracked hose.
3. Worn piston and/or cup.
Tighten to specified
torque.
Replace.
Replace piston and/or cup.
Excessive brake
lever stroke. 1. Air in hydraulic system.
2. Insufficient brake fluid.
3. Improper quality of brake fluid.
Bleed air.
Replenish fluid to specified
level ; bleed air.
Replace with correct fluid.
SERVICING INFORMATION 8-8