Sym DD 50, Service Manual

Page: 101 / 157

11. BRAKE SYSTEM
11-4
Maintenance Information
Precautions in Operation
Caution
Inhaling brake lining ashes may cause disorders of respiration system, therefore, never use air hose
or dry brush to clean brake parts. Use vacuum cleaner or other authorized tool instead.
y
The brake caliper can be removed without removing the hydraulic system.
y
After the hydraulic system is removed, or the brake system is felt to be too soft, bleed the hydraulic
system.
y
While refilling brake fluid, care should be taken not to let the foreign material entering into the brake
system.
y
Do not spill brake fluid on the painted surfaces, plastic or rubber parts to avoid damage.
y
Check the operation of the brake system before you go.
Specifications
Item Standard (mm) Limit (mm)
The thickness of front brake disc 3.5 2.0
Front brake disc run-out < 0.10 0.3
Master cylinder inner diameter 12.700 – 12.743 12.55
Master cylinder piston outer diameter 12.657 – 12.684 12.654
ID of front brake drum 110.0 110.5
ID of rear brake drum 95.0 95.5
Thickness of front brake lining 4.0 2.0
Thickness of rear brake lining 4.0 2.0
Torque values
Brake hose bolt 3.5kgf-m
Bolt for brake caliper 3.3kgf-m
Bolts for the lining guide pin 1.8kgf-m
Bolts for the lining guide pin cap 1.0kgf-m
Air-bleed valve 0.55kgf-m
Bolts for the brake disc 4.5kgf-m
Nuts for the wheel rim 2.5kgf-m
Nuts for the front wheel 6.0kgf-m
Nuts for the rear wheel 11.0kgf-m
Bolt for rear brake arm 0.55kgf-m
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