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Brake Rotor Specification Checking
 
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Pelican Technical Article:

Brake Rotor Specification Checking

Nick Czerula

Time:

1.5 hours

Tab:

$20

Talent:

***

Tools:

Micrometer, jack and jack stands, wheel chocks, safety glasses, torque wrench, lug wrench

Applicable Models:

Volvo V70 (1998-01)
Volvo V70 2.4T (2001)
Volvo V70 AWD (1998-99)
Volvo V70 GLT (1998-00)
Volvo V70 GLT SE (2000)
Volvo V70 R (1998)
Volvo V70 R AWD (1999-00)
Volvo V70 T5 (1998-01)
Volvo V70 X/C (2001)
Volvo V70 X/C AWD (1998-00)
Volvo V70 X/C AWD SE (2000)

Parts Required:

Brake rotors

Hot Tip:

Measure in 10 locations and mark each location after measuring

Performance Gain:

Brake performance restored

Complementary Modification:

Replace brake pads

Volvo V70 vehicles are equipped with disc brakes at each wheel. The front discs (or rotors) are larger and usually vented for better cooling. The rear rotors are integrated with the parking brake drums. To withstand the mechanical and thermal stresses of braking, brake rotors are required to be replaced if they are worn thinner than a certain minimum thickness. This minimum thickness is stamped on the edge of the rotor.

This tech article will go over measuring your brake rotors to see if they require replacing. When checking brake rotor thickness, measure the rotor in about 10 different spots. Mark each spot to keep track of where you have measured. If the rotor does not meet minimum thickness specifications, replace it. Replace brake rotors in pairs. If your brake rotor passes thickness but you have a pulsation while using the brakes, replace the brake rotors. Also inspect for overheating, cracks and rust on the braking surface of the rotor.

Brake rotor minimum thickness per V70 model

Front

Rear

V70 base

23 mm

8.4 mm

V70 AWD turbocharged Lucus

23 mm

8 mm

V70 AWD turbocharged Teves

23 mm

10 mm

V70 GLT

23 mm

8.4 mm

V70 XC AWD turbocharged Lucus

23 mm

8 mm

V70 XC AWD turbocharged Teves

23 mm

10 mm

V70 R AWD turbocharged Lucus

23 mm

8 mm

V70 R AWD turbocharged Teves

23 mm

10 mm

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Most factory rotors and some aftermarket rotors will have a minimum thickness stamped on the rotor in one of two locations indicated by the green and red arrow.
Figure 1

Most factory rotors and some aftermarket rotors will have a minimum thickness stamped on the rotor in one of two locations indicated by the green and red arrow. This will be in the area of the hat or hub flange. Clean the rust away from the rotor to uncover the specs. There may also be a part number.

Lift the axle of the vehicle you are measuring the brake rotors on.
Figure 2

Lift the axle of the vehicle you are measuring the brake rotors on. See our tech article on jacking your vehicle. Using a micrometer (green arrow), measure the brake rotor (red arrow) in at least 10 different places. I like to mark that place of measurement using a magic marker. Sometimes finding a rotor with thickness variations can help you find the source of a brake pulsation. This photo shows the front rotor.

The rear rotor is a bit tougher to fit the micrometer (green arrow).
Figure 3

The rear rotor is a bit tougher to fit the micrometer (green arrow). Slide it between the brake caliper and heat shield as shown, to gain access to the rotor (red arrow).

It is also a good idea to measure your brake pad thickness.
Figure 4

It is also a good idea to measure your brake pad thickness. Replace when they are at 3mm (0.12 in.) or below. The measurement gauge I am using in this photo is color coded to help identify how close to replacement my brake pads are. You should measure the outer (red arrow) and the inner pad (green arrow).


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