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1997 Volvo 850
pg. 4:16 Brake system
Anti-lock Brake System (ABS)
If the warning lamp lights up there is a malfunction of the ABS system (the standard braking system will
however function) and the vehicle should be driven cautiously to a Volvo retailer for inspection. The
Anti-lock Braking System (ABS) helps to improve vehicle control (stopping and steering) during severe
braking conditions by limiting brake lock-up. When the system "senses" impending lock-up, braking
pressure is automatically modulated in order to help prevent lockup, which could lead to a skid.
The system performs a self-diagnostic test when the vehicle first reaches a speed of approximately 12
mph (20 km/h). The brake pedal will pulsate several times and a sound may be audible from the ABS
control module. This is normal.
To obtain optimal effect from the ABS system, constant pressure should be kept on the brake pedal
while the system is modulating the brakes. Do not pump the brake pedal.
The switching of the ABS modulator will be audible and the brake pedal will pulsate at this time. Please
be aware that ABS does not increase the absolute braking potential of the vehicle. While control will be
enhanced, ABS will not shorten stopping distances on slippery surfaces.
Brake circuit malfunction
If one of the brake circuits should malfunction, the red warning light will come on, the pedal stroke
increases slightly, the pedal feels softer and extra pressure is required for normal braking. If the light
comes on while driving or braking, stop immediately and check the brake fluid level in the reservoir.
WARNING! If the fluid level is below the MIN mark in either section of the reservoir: DO NOT
DRIVE. Tow the car to a Volvo retailer and have the brake system checked and any leakage repaired.
Moisture on brake discs and brake pads affects braking
Driving in rain and slush or passing through an automatic car wash can cause water to collect on the
brake discs and pads. This will cause a delay in braking effect when the pedal is depressed. To avoid
such a delay when the brakes are needed, depress the pedal occasionally when driving through rain,
slush etc. This will remove the water from the brakes. Check that brake application feels normal. This
should also be done after washing or starting in very damp or cold weather.
file:///K|/ownersdocs/1997/1997_850/97850_416.htm (1 of 5)12/30/2006 10:14:21 AM