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In Depth Braking Tips & Products for Your Front Wheel Drive Volvo

Page 5: ABS/Tracs Light On?, Replacement ABS Control Modules, External Torx Socket Set, Brake Light Switch

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ABS/Tracs Light On?

If your 850 and later model vehicle has an ABS/Tracs light on then “you’ve got codes”. A common failure for the Teves system is the control unit itself and can set a number of codes including 123-124-213-214-313-314-323-324 for the rear wheel speed sensors, namely the right side. Don’t confuse these with codes 141-142 for the pedal position sensor which also has a somewhat high failure rate. Later version 850’s, namely 95 and up through the 70 series, used mostly Teves control units. 93-94 850’s used ATE control units.Before replacing expensive modules and sensors be sure to check for physical damage of the wheel speed sensor, the pulse ring, and the wiring. Be sure no debris like sticks, rocks, or rope has damaged the wire to the sensor. To test your wheel speed sensors, disconnect the main harness connector from the ABS unit and find the pins for the wheel speed sensor fault you have.

LF = pin 11 & 4, RF = pin 18 & 3, LR = pin 2 & 10, RR = pin 1 &17

Using a digital Volt/Ohm meter measure the resistance between the pins with the key off. The reading should be between 1040ohms and 1160 ohms. With the key on check for voltage between pin 8 and pins 4,3,11,18 the reading should be around 2-3 volts. Have a helper rotate the wheel while you monitor the volt reading, you should see a changing/pulsing voltage as the wheel is rotated. If your sensors have the correct ohm value and the voltage output is correct, chances are you need a control module. In some cases when the ABS/Tracs light is on yet there are no codes, you may have a bad ignition switch. With the vehicle running, jiggle the key back and forth in the ignition and look for the lights to come on, if they do you will need to replace the ignition switch.

Replacement ABS Control Modules

Antilock Brake Systems or ABS is an integral part of the safety of your car. Stopping a car on a slippery surface or in a panic situation can cause us to quickly appreciate ABS. These systems work with the aid of sensors at the wheels, computers and control modules. ABS allows us to slow and steer the car in the event the tires lose traction with the ground in most low traction conditions. When the ABS system does not work properly we are not reaping the full advantage of a major safety system. To ensure you are getting the most out of this feature, make sure your TRACS or ABS light is off. Not sure if your vehicle has TRACS? Models equipped with TRACS will have both a TRACS light and TRACS button on the dash board. ipd now offers remanufactured ABS control modules for many Volvo models.

Click Your Model to Find the Right ABS Control Module:850 ModelsS70, V70 Models (1998-2000)C70 Models (1998-2005)

External Torx Socket Set

If your 850 and later model vehicle has an ABS/Tracs light on and the module is the culprit (diagnostic trouble codes123-124-213-214-313-314-323-324) you’ll need our E5 external torx to remove the control unit. The four fasteners are accessed from the bottom of the unit and require a bit of care to ensure no damage occurs. Don’t try to use a socket that is ‘close’ or you may just have two problems on your hands! Better yet, get our 11 piece external torx set, containing E4 through E20 and tackle those front wheel bearing fasteners too!

Brake Light Switch

If you’ve replaced all your brake light bulbs but still don’t have brake lights, chances are you’ve got a bad brake switch. There are two brake switches on the brake pedal of your 850/70. One switch has a vacuum line attached, this is for cruise control while the other switch (the larger of the two) is for powering the brake lights. The internal contacts tend to burn out over time and simply replacing the switch is typically all that is necessary to bring your brake lights back on. Of course don’t forget to check the basics like fuses and bulbs! You’ll need a Torx 25 driver to remove the lower bolster cover to access the brake switch.

850 - 1994-1998
S70/V70 - 1998-2000
C70 - 1998-2005
S60 AWD - 2001
S60 FWD - 2001-2010
S60 AWD - 2002-2010
V70/XC70 AWD - 2001
V70 FWD - 2001-2010
V70 AWD - 2002-2010
XC70 - 2002-2010
S80 - 1999-2000 up to chassis 116810
S80 - 2001-2006
XC90 - 2003-2010

Brake Hardware Kits

Volvos have a history of front brake problems. Part of the weakness of these systems relates to the slider style calipers used on these cars. The rubber boots on these sliders will sometimes tear or degrade from heat and allow lubricated parts to be exposed to the elements. Once the grease washes out it’s only a matter of time before the calipers begin to malfunction. Binding hardware, dragging brake pads and rotor warping are only some of the potential outcomes. These kits do not include parts for caliper pistons.

Click here for the listing for brake hardware kits

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