Page 460 - 2019 SHOP MANUAL CRF1000/A/D

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HYDRAULIC BRAKE
SERVICE INFORMATION
HYDRAULIC BRAKE
GENERAL

Frequent inhalation of brake pad 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.

Spilling brake fluid will severely damage instrument lenses and painted surface. It is also harmful to some rubber parts. Be careful
whenever you remove the reservoir cover; make sure the front reservoir is horizontal first.
• A contaminated brake disc or pad reduces stopping power. Discard contaminated pads and clean a contaminated disc with a
high quality brake degreasing agent.
• Check the brake system by applying the brake lever or pedal after the air bleeding.
• Never allow contaminates (dirt, water, etc.) to get into 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, they
may not be compatible.
• Always check brake operation before riding the motorcycle.
• This section covers service of the conventional brake components of the brake system. For Anti-lock Brake System (ABS)
service (page 20-2).

TROUBLESHOOTING

Brake lever/pedal soft or spongy
• Air in hydraulic system
• Low brake fluid level
• Leaking hydraulic system
• Clogged fluid passage
• Contaminated brake pad/disc
• Worn caliper piston seals
• Worn master cylinder piston cups
• Worn brake pad/disc
• Contaminated caliper
• Caliper not sliding properly
• Warped/deformed brake disc
• Sticking/worn caliper piston
• Sticking/worn master piston
• Contaminated master cylinder
• Bent brake lever/pedal
Brake lever/pedal hard
• Clogged/restricted hydraulic system
• Sticking/worn caliper piston
• Caliper not sliding properly
• Clogged/restricted fluid passage
• Worn caliper piston seal
• Sticking/worn master piston
• Bent brake lever/pedal
Brake drag
• Contaminated brake pad/disc
• Misaligned wheel
• Clogged/restricted brake hose joint
• Warped/deformed brake disc
• Caliper not sliding properly
• Clogged/restricted brake hydraulic system
• Sticking/worn caliper piston
• Clogged master cylinder port

19-2