VOLVO XC70 2006 Owner´s Manual

113
Brake system

 


  
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Water 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.
Severe strain on the brake system
The brakes will be subject to severe strain when driving in mountains or
hilly areas or towing. Vehicle speed is usually slower, which means that
the cooling of the brakes is less efficient than when driving on level
roads. To reduce the strain on the brakes, shift into a lower gear and let
the engine help with the braking. Do not forget that, if you are towing a
trailer, the brakes will be subjected to a greater than normal load.
BRAKEBrake circuit malfunction

   

    

 
 




 
      






  





   


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NOTE: When the car is at a standstill and the engine is idling, e.g. at a
traffic light and the brake pedal is depressed, the pedal may go down
slightly. This is normal and is caused by an built-in function in the
power brake system.
Power brakes function only when the engine
is running

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114
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 lockup. When the system "senses" impending lockup, 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 engine is started
and 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. Do not pump the brake pedal.
The switching of the ABS modulator will be audible and the brake pedal
will pulsate during braking. 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.
ABS with EBD (Electronic Brake Force Distribution)
EBD is an integrated part of the ABS system. EBD regulates the
hydraulic pressure to the rear brakes to help provide optimal braking
capacity. The brake pedal will pulsate during braking, which is normal.
If the BRAKE and ABS warning lights come on at the same
time, this could indicate a fault in the brake system.
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115
STC/DSTC
Stability Traction Control (STC)*/
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117
Chapter 7 - Wheels and tires
General information 118
Tire inflation 120
Tire inflation pressure tables 122
Tire Pressure Monitoring System (TPMS) 123
Self supporting run flat tires 125
Tire designations 126
Glossary of tire terminology 127
Vehicle loading 128
Uniform Tire Quality Grading 129
Snow chains, snow tires, studded tires 130
Temporary spare 131
Changing a wheel 132

118
Wheels and tires
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WARNING!
 The wheel and tire sizes for your Volvo
are specified to meet stringent stability
and handling requirements. Unapproved
wheel/tire size combinations can negative-
ly affect your vehicle's stability and
handling. Approved tire sizes are shown
in the Tire inflation pressure tables on
page 122.
 Any damage caused by installation of
unapproved wheel/tire size combinations
will not be covered by your new vehicle
warranty. Volvo assumes no responsibility
for death, injury, or expenses that may
result from such installations. Tread wear indicator

119
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Wheels and tires
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120
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122
Wheels and tires
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