grinding noise after replacing front brake pads

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adk793
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Year and Model: 2000 V70 XC AWD/SE
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grinding noise after replacing front brake pads

Postby adk793 » Thu May 20, 2010 5:47 am

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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polskamafia mjl
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Re: grinding noise after replacing front brake pads

Postby polskamafia mjl » Thu May 20, 2010 6:04 am

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.
'All my money is gone and I have an old Volvo.' - Bamse's Turbo Underpants

Current: 1995 Volvo 850 T-5R Manual - Bringing it back from the brink of death
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charlyW
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Re: grinding noise after replacing front brake pads

Postby charlyW » Thu May 20, 2010 10:32 am

+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]
855 T-5 RHD Blue: MBC, Custom Map based on Rica, K&N Filter, 18T Turbocharger, White/Green injectors [depends on my mood], Blue Silicone vacuum hoses

ptseko
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Joined: Wed May 05, 2010 3:01 pm
Year and Model: 98 XC70
Location: Boston, MA

Re: grinding noise after replacing front brake pads

Postby ptseko » Thu May 20, 2010 1:09 pm

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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charlyW
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Re: grinding noise after replacing front brake pads

Postby charlyW » Thu May 20, 2010 5:13 pm

Copper grease or similar is needed
855 T-5 RHD Blue: MBC, Custom Map based on Rica, K&N Filter, 18T Turbocharger, White/Green injectors [depends on my mood], Blue Silicone vacuum hoses

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E Showell
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Re: grinding noise after replacing front brake pads

Postby E Showell » Thu May 20, 2010 6:24 pm

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.
'98 V70 NA FWD 5 spd, silver sand metallic
'99 V70 NA FWD Auto, dark blue
'99 S70 NA FWD Auto, black

Timberwolf530
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Year and Model: 1994 850
Location: Indiana

Re: grinding noise after replacing front brake pads

Postby Timberwolf530 » Fri May 21, 2010 3:42 pm

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.
1994 850 Wagon - My car is on it's 3rd generation in my family. "I don't look at it as doing repairs, I see it as doing a complete restoration one part at at time."


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