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grinding noise after replacing front brake pads

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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grinding noise after replacing front brake pads

Postby adk793 » 20 May 2010, 05:47

A few weeks ago, i replaced my front brake pads because my volvo independent mechanic told me they were at 10%. They didn't feel this way but i took his advice and changed them. With the new pads, the brakes/car makes a grinding noise when the brakes get warm. It sounds almost like when the brakes are gone, that kind of grinding noise. I never had such problems with the car and not sure whats the problem. The grinding is clearly not a good thing. What should i do? Could something have went wrong during the repair?
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Re: grinding noise after replacing front brake pads

Postby polskamafia mjl » 20 May 2010, 06:04

On my friend's pick up truck we found that when he last did his front brakes, he forgot to tighten one of the caliper carrier bolts. The bolt fell out and the entire caliper assembly began dragging on the outer edge of the rotor. I would start by taking the front wheels off and feeling the entire brake assembly and seeing if anything is loose. If you can't find anything, spin the rotor (with the wheel still off) and listen for the noise. If you find that the noise is not coming from the front, repeat the same procedure with the rear wheels. Get back to us with what you find.
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Re: grinding noise after replacing front brake pads

Postby charlyW » 20 May 2010, 10:32

+1 might need copper slip on the anti squeel/rattle pads this is often over looked. Don't be had by the "You need OEM pads" could be you have a warped rotor [disc]
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Re: grinding noise after replacing front brake pads

Postby ptseko » 20 May 2010, 13:09

I have a similar problem with my 98 xc70. I replaced everything on the brake system and it stops on a dime but there is a metallic grinding/rubbing noise on the front left side that only happens when I let off the gas! When I accelerate it is fine, the moment I let off the gas and coast, I hear it.

Any ideas? I am not worried about it; but it is a great big pain the in the neck!!
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Re: grinding noise after replacing front brake pads

Postby charlyW » 20 May 2010, 17:13

Copper grease or similar is needed
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Re: grinding noise after replacing front brake pads

Postby E Showell » 20 May 2010, 18:24

There is a shield that sits behind the rotor. If you weren't careful in your work, it is possible you bent it and it is rubbing on the rotor. This will produce a grinding sound, though generally intermittent since there is usually only contact in one spot. As has been suggested, jack the car up, remove the tire and rotate the wheel slowly listening for the scrape all the while. This will reveal a bent shield.
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Re: grinding noise after replacing front brake pads

Postby Timberwolf530 » 21 May 2010, 15:42

I agree with the inner shield diagnosis. The normal position for this is just a few mm away from the rotor, so it doesn't take much of a bend to make it rub. This happened to me when I changed my Wheel hub. Just take the wheel off and shine a flashlight between the rotor and shield. Use a screwdriver to gently pry it away from the rotor if it is touching. It bends easily, and there is no need to take the whole brake assembly apart if that is your problem.
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