Kymco MO KXR 50 Service Manual - chap 13 (ruota freno post)
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-0
Mongoose/KXR 90/50
13
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REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
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SERVICE INFORMATION -------------------------------------------- 13- 2
REAR WHEEL ---------------------------------------------------------- 13- 4
REAR SWING ARM ---------------------------------------------------- 13-10
HYDRAULIC BRAKE -------------------------------------------------- 13-15
BRAKE PAD/DISK ----------------------------------------------------- 13-16
BRAKE MASTER CYLINDER ----------------------------------------- 13-17
BRAKE CALIPER------------------------------------------------------- 13-20
DRUM BRAKE ---------------------------------------------------------- 13-22
13
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-1
Mongoose/KXR 90/50
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-2
Mongoose/KXR 90/50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• During servicing, keep oil or grease off the brake drum and brake linings.
• During servicing, keep oil or grease off the brake disk and brake pads.
• Drain the brake fluid from the hydraulic brake system before disassembly.
• Contaminated brake disk or brake pads reduce stopping power. Clean the contaminated brake
disk with high-performance brake degreaser and replace the brake pads.
• Do not use brake fluid for cleaning.
• Bleed air from the brake system if the brake system is removed or the brake is soft.
• Do not allow any foreign matters entering the brake reservoir when filling the brake reservoir with
brake fluid.
• Brake fluid will damage painted, coated surfaces and plastic parts. When working with brake
fluid, use shop towels to cover and protect painted, rubber and plastic parts. Wipe off any splash
of brake fluid with a clean towel. Do not wipe the motorcycle with a towel contaminated by
brake fluid.
• Make sure to use recommended brake fluid. Use of other unspecified brake fluids may cause
brake failure.
• Inspect the brake operation before riding.
SPECIFICATIONS
Item
Standard (mm)
Service Limit (mm)
Radialæ2.0
Rear wheel
Axialæ2.0
Rear brake drum I.D
130_ 130.2
131
Brake disk thickness (disk brake)
3.8_ 4.2
3.0
Brake disk runout (disk brake)
°–
0.3
Rear brake lining thickness (drum brake)
4.5
2.0
TORQUE VALUES
Rear wheel nut 4.0_ 5.0kgf-m
Rear shock absorber upper mount bolt 3.5_ 4.5kgf-m
Rear shock absorber lower mount bolt 3.5_ 4.5kgf-m
Rear swing arm axle 6.0_ 8.0kgf-m
Rear wheel hub nut 6.0_ 8.0kgf-m
Brake arm bolt 1.8_ 2.5kgf-m
Caliper holder bolt 2.9_ 3.5kgf-m
Brake fluid tube bolt 3.0_ 4.0kgf-m
Caliper bleed valve 0.4_ 0.7kgf-m
Master cylinder bolt 1.0_ 1.4kgf-m
Rim run out
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-3
Mongoose/KXR 90/50
TROUBLESHOOTING
Rear wheel wobbling Poor brake performance (Drum Brake)
• Bent rim • Brake not adjusted properly
• Faulty tire • Worn brake linings
• Axle not tightened properly • Worn brake shoes at cam contacting area
• Worn brake cam
Soft rear shock absorber • Worn brake drum
• Weak shock absorber spring
• Faulty damper
Loose brake lever (Disk Brake) Tight brake lever (Disk Brake)
• Air in hydraulic brake system •Seized piston
• Brake fluid level too low •Clogged hydraulic brake system
• Hydraulic brake system leakage •Smooth or worn brake pad
Hard braking (Disk Brake) Poor brake performance (Disk Brake)
• Seized hydraulic brake system Contaminated brake pad surface
• Seized piston
Brake noise (Disk Brake)
• Contaminated brake pad surface
• Excessive brake disk run out
• Incorrectly installed caliper
• Brake disk or wheel not aligned
Poor brake performance (Disk Brake)
• Air in brake system
• Deteriorated brake fluid
• Contaminated brake pads and brake disk
• Worn brake pads
• Worn brake master cylinder piston oil seal
• Clogged brake fluid line
• Deformed brake disk
• Unevenly worn brake caliper
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-4
Mongoose/KXR 90/50
REAR WHEEL
REAR WHEEL REMOVAL
Place the machine on a level place.
Remove four nuts attaching the wheel.
Remove wheel.
INSPECTION
Measure the wheel runout.
Service Limit:
Vertical: 2.0 mm
Lateral: 2.0mm
Replace wheel if out of specification.
INSTALLATION
Install the rear wheel and tighten the nuts
(wheel).
Torque: 4.0_ 5.0kgf-m
Nuts
Elevate the rear wheels by placing a
suitable stand under the rear of frame.
Support the machine securely so there is
no danger of it falling over.
°Ø
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-5
Mongoose/KXR 90/50
REAR WHEEL HUB REMOVAL
Remove rear wheel nuts. (See page 13-4)
Remove the wheel hub nut cover and cotter
pin.
Loosen nut attaching the wheel hub.
Remove rear wheel. (See page 13-4)
Remove wheel hub nut, washer and wheel
hub.
INSPECTION
Replace it if the wheel hub is cracks or
damage.
Replace it if splines of the wheel hub is
wear or damage.
INSTALLATION
Install wheel hub, washer and wheel hub
nut.
Torque: 6.0_ 8.0kgf-m
Install the cotter pin and band ends of cotter
pin.
Nut Cover
Cotter Pin
Washer
Nut
Wheel Hub
Splines
Wheel Hub
Do not loosen the axle nut after torque
tightening. If the axle nut groove is not
aligned with the cotter pin hole, align
groove with the hole by tightening up on
the axle nut.
°Ø
Always use a new cotter pin.
°Ø
Apply grease onto the splines of the
wheel hub.
°Ø
Elevate the rear wheels by placing a
suitable stand under the rear of frame.
Support the machine securely so there is
no danger of it falling over.
°Ø
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-6
Mongoose/KXR 90/50
REAR AXLE REMOVAL
Remove the rear wheel hub of the both rear
wheels. (See page 13-5).
Remove the collars on the rear axle right and
left side.
Relax the drive chain. (Refer to the “DRIVE
CHAIN SLACK ADJUSTMENT” section
in chapter 3.)
Remove driven sprocket.
Remove the rear axle from right side.
Remove the two bolts and caliper and then
remove brake disk.
Collars
Driven Sprocket
Rear Axle
Bolts
Brake Disk
Bolts
Drive Chain
Caliper
13. REAR WHEEL/SWING ARM/
HYDRAULIC BRAKE
13-7
Mongoose/KXR 90/50
Remove the four bolts and rear axle hub.
INSPECTION
Replace it if the rear axle is scratched
(excessively) or damage.
Replace if splines and threads of the rear
axle is wear or damage.
Measure the rear axle run out.
Service limit: less than 1.5mm
Replace if it is out of specification.
Replace it if the driven sprocket is cracks or
damage.
Replace it if splines of the driven sprocket
is wear or damage.
Splines
Do not attempt to straighten a bent axle.
°Ø
Bolts
Axle Hub
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