Brake System (Standard) Service Information - Honda GL1800 Service Manual

SERVICE INFORMATION
GENERAL
Frequent inhalation of brake lining dust, regardless of material composition, could be hazardous to your health.
• Avoid breathing dust particles.
• Never use an air hose or brush to clean brake assemblies. Use an OSHA-approved vacuum cleaner.
• This motorcycle is equipped with the following systems:
– LBS (Linked Brake System) – that is designed to engage both front and rear brakes when either the brake lever or
brake pedal is used.
– ABS (Anti-lock Brake System) – that is designed to help prevent wheel lock-up during hard braking on loose or slip-
pery surfaces.
• This section (15-A) covers service of the standard brake components (including LBS) of the brake system. For ABS ser-
vice, see section 15-B.
• Note that there is no brake fluid in the ABS modulator (except in the modulator head), because the modulator is the
motor-driven hydraulic pressure type. Therefore, brake fluid replacement and bleeding air from the modulator body is
not necessary.
• A contaminated brake disc or pad reduces stopping power. Discard contaminated pads and clean a contaminated disc
with a high quality brake degreasing agent.
• Spilled brake fluid will severely damage the plastic parts and painted surfaces. It is also harmful to some rubber parts.
Be careful whenever you remove the reservoir cap; make sure the reservoir is horizontal first.
• Never allow contaminants (e.g., dirt, water) to enter an open reservoir.
• Once the hydraulic system has been opened, or if the brake feels spongy, the system must be bled.
• Always use fresh DOT 4 brake fluid from a sealed container when servicing the system. Do not mix different types of
fluid as they may not be compatible.
• Always check brake operation before riding the motorcycle.
SPECIFICATIONS
Specified brake fluid
Front Brake disc thickness
Brake disc runout
Master cylinder I.D.
Master piston O.D.
Caliper cylinder
I.D.
Caliper piston O.D.
Rear Brake disc thickness
Brake disc runout
Pedal master cylinder I.D.
Pedal master piston O.D.
Secondary master cylinder I.D.
Secondary master piston O.D.
Caliper cylinder I.D.
Caliper piston O.D.
ITEM
Left Upper
Center
Lower
Right Upper
Center
Lower
Left Upper
Center
Lower
Right Upper
Center
Lower
Upper
Center
Lower
Upper
Center
Lower
BRAKE SYSTEM (Standard)
STANDARD
DOT 4
4.5 (0.18)
–
14.000 – 14.043 (0.5512 – 0.5529)
13.957 – 13.984 (0.5495 – 0.5506)
22.650 – 22.700 (0.8917 – 0.8937)
27.000 – 27.050 (1.0630 – 1.0650)
22.650 – 22.700 (0.8917 – 0.8937)
25.400 – 25.450 (1.0000 – 1.0020)
25.400 – 25.450 (1.0000 – 1.0020)
22.650 – 22.700 (0.8917 – 0.8937)
22.585 – 22.618 (0.8892 – 0.8905)
26.935 – 26.968 (1.0604 – 1.0617)
22.585 – 22.618 (0.8892 – 0.8905)
25.335 – 25.368 (0.9974 – 0.9987)
25.335 – 25.368 (0.9974 – 0.9987)
22.585 – 22.618 (0.8892 – 0.8905)
11.0 (0.43)
–
17.460 – 17.503 (0.6874 – 0.6891)
17.417 – 17.444 (0.6857 – 0.6868)
14.000 – 14.043 (0.5512 – 0.5529)
13.957 – 13.984 (0.5495 – 0.5506)
22.650 – 22.700 (0.8917 – 0.8937)
27.000 – 27.050 (1.0630 – 1.0650)
22.650 – 22.700 (0.8917 – 0.8937)
22.585 – 22.618 (0.8892 – 0.8905)
26.935 – 26.968 (1.0604 – 1.0617)
22.585 – 22.618 (0.8892 – 0.8905)
Unit: mm (in)
SERVICE LIMIT
–
3.5 (0.14)
0.30 (0.012)
14.055 (0.5533)
13.945 (0.5490)
22.71 (0.894)
27.06 (1.065)
22.71 (0.894)
25.46 (1.002)
25.46 (1.002)
22.71 (0.894)
22.56 (0.888)
26.91 (1.059)
22.56 (0.888)
25.31 (0.996)
25.31 (0.996)
22.56 (0.888)
10.0 (0.39)
0.30 (0.012)
17.515 (0.6896)
17.405 (0.6852)
14.055 (0.5533)
13.945 (0.5490)
22.71 (0.894)
27.06 (1.065)
22.71 (0.894)
22.56 (0.888)
26.91 (1.059)
22.56 (0.888)
15-3