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New Pads, New Rotors -> Testing

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Metallo
Posts: 220
Joined: Sun Jan 18, 2004 3:20 pm
Year and Model: XC 70 AWD 2.5 - 2006
Location: Canada
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Metallo

New Pads, New Rotors -> Testing

Post by Metallo » Sat Jul 22, 2017 8:15 pm

Hi guys,

So, after having changed control arms bushings, wheel hubs, tie rods, ball joints, new Brembo rotors and new ceramic pads from Akebono, I drove my XC70 for 10 minutes and I found the following marks on the rotors.

Image

Image

Obviously, both rotors have been cleaned before putting on the wheels and I still have to take the car to the garage for alignment.
The car seems to drive well, although I did not drive on a highway at higher speed, but I am concerned about those marks on the rotors, what could be causing it?

Thank you
Alex
Polar 940 Turbo SW - 1997
XC 70 AWD 2.5 - 2005
XC 70 AWD 2.5 - 2006

jimmy57
Posts: 6485
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
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jimmy57

Re: New Pads, New Rotors -> Testing

Post by jimmy57 » Sat Jul 22, 2017 8:31 pm

Looks normal. If you had bedded in the pads to rotors there would be some bluing of the rotors. It will take some time and the rotors will get the more polished look. What you are seeing is the early signs of pad material depositing into pores of the rotor metal.

Metallo
Posts: 220
Joined: Sun Jan 18, 2004 3:20 pm
Year and Model: XC 70 AWD 2.5 - 2006
Location: Canada
Has thanked: 1 time
Been thanked: 2 times
Canada
Metallo

Re: New Pads, New Rotors -> Testing

Post by Metallo » Sun Jul 23, 2017 3:49 am

Hi,

Thank you so much for having reassured me :)

Cheers,
Alex
Polar 940 Turbo SW - 1997
XC 70 AWD 2.5 - 2005
XC 70 AWD 2.5 - 2006

Georgeandkira
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Joined: Tue Apr 07, 2009 8:24 am
Year and Model: 2007 V70 base
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Georgeandkira

Re: New Pads, New Rotors -> Testing

Post by Georgeandkira » Sun Jul 23, 2017 7:44 am

Were the "wheel hubs" you changed the bearings? How many miles on your '06? thx, Kira

Metallo
Posts: 220
Joined: Sun Jan 18, 2004 3:20 pm
Year and Model: XC 70 AWD 2.5 - 2006
Location: Canada
Has thanked: 1 time
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Metallo

Re: New Pads, New Rotors -> Testing

Post by Metallo » Sun Jul 23, 2017 4:33 pm

Hi,

I bought this car a few weeks ago, so this is a 2005 with 128000 miles.
I am not sure to understand your question regarding the hubs, but yes they are the bearings, this is the P/N 274298.

Alex
Polar 940 Turbo SW - 1997
XC 70 AWD 2.5 - 2005
XC 70 AWD 2.5 - 2006

jbeebo
Posts: 107
Joined: Wed May 01, 2013 11:39 am
Year and Model: S60, 2005
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jbeebo

Re: New Pads, New Rotors -> Testing

Post by jbeebo » Wed Jul 26, 2017 11:02 pm

Looks normal Alex, I agree with Jimmy57.

When I worked at Bosch braking systems, they used this procedure to bed pads to the rotors before they would do braking performance testing and ABS tuning. Simple really. Accelerate lazily to 30mph, coast for a bit and then brake at 0.2-0.3g. Do this 100 times. After this you can increase speeds to 45mph and again brake at 0.3g. Do this 50-ish times. It took a driver a couple hours to do this. After this the rotors and pads have fully seated, pad material has transferred to the rotor surface and all volatile materials have been evacuated. Brakes are ready to go.

Because you don't have instrumentation to guide this process, do this instead: drive your car. That cycles above looks a lot like a normal commute. Take it easy on the brakes for the first few weeks, no hard stops, give brakes time to cool between stops. Basically drive defensively like you're a fuel-saving hyper-miler. But please, if you ever need to stop aggressively in an emergency by all means mash the brakes. Would rather replace rotors and pads then cause a crash.

PS: you did service the caliper slide pins right?
2005 S60 2.4L (B5244S6), 175k miles

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