Installed all new oem brakes, now gentle sound when driving

[johnnyh55]

I installed all new pads and rotors on all 4 corners and they are all mazda oem parts. Now there is a slight gentle sound when driving that you can hear without the radio or the blower motor running. It just a small rattle but when you step a little bit on the brakes it stops making the noise. I am not sure what it could be, maybe the outer pad vibrating a little bit? I did not use the permatex disc brake quiet that I usually use because I couldn't find my can. It usually makes the outer pad stick to the caliper, do you guys think that could be it or it would be something else?


Also, what grease do you guys use when lubing the caliper bracket? I used the clear caliper lube on the slider pins but it doesn't seem to be the right type of lubricant for the caliper bracket where the pads slide? The reason I say that is because I use to have a black graphite grease and it seemed to prevent rust alot better then the clear grease that I put on the slider pins but I can't seem to find the stuff in store anymore.

[staax]

Did any brake shims come with your new pads? If not you would need to remove them from your old ones and transfer them to your new one.

I've yet to do brakes on Mazda yet but generally you'll find a set of shims with them that prevents them from moving and rattling. You're fine with out them but the sound will bug you like it does me.

As per the grease any high-heat stuff will work for the caliper bracket.

I use either silicone or lithium grease (which ever one is safe on the rubber boots - I can't remember which) for the slide pins.

[johnnyh55]

Did any brake shims come with your new pads? If not you would need to remove them from your old ones and transfer them to your new one.

I've yet to do brakes on Mazda yet but generally you'll find a set of shims with them that prevents them from moving and rattling. You're fine with out them but the sound will bug you like it does me.

As per the grease any high-heat stuff will work for the caliper bracket.

I use either silicone or lithium grease (which ever one is safe on the rubber boots - I can't remember which) for the slide pins.

Well you got me thinking, but the new pads didn't come with separate shims in the box. I didn't notice but could they be built into the pad?

I still have my old pads but I don't think they have shims that I can't transfer since they are crappy aftermarket.

[staax]

Most pads today come with the shims on them even the cheap ones, but its possible they don't.

They are just clipped on so a flathead screwdriver will pop them off.

What year is your car btw?

[danacosta24]

I may have had a similar issue, although, mine was more of a clicking when coasting than a rattle.

Make sure the wheel brake dust shield has enough clearance that its not touching anything.
Also make sure you tightened the lugs back on with a torque wrench. One of mine started coming loose after about a month when I didn't use a torque wrench. When I used the torque wrench I found 1 lug that need about a quarter turn and there was no more issues.

But if that's not it then good luck!

[johnnyh55]

Most pads today come with the shims on them even the cheap ones, but its possible they don't.

They are just clipped on so a flathead screwdriver will pop them off.

What year is your car btw?

I would assume OEM pads would come with the shims.

The car is a 2007 Mazda 3 GT

[staax]

Its also possible that the clips which secure the pads to the inside of the caliper piston and to the caliper are too small causing the pads to move around. Just pry back on those little tabs so they sit firmly in place.

For extra quietness, apply a thing layer of grease on the back of the shim, not the pad.

Ensure that the caliper bracket and caliper are secured firmly.

Oh lastly, did you make sure to bed the brakes?

[Johns 08 3 GT]

I would assume OEM pads would come with the shims.

The car is a 2007 Mazda 3 GT

There are no shims for the Mazda3. They just sit in the bracket. There is a small retaining spring though.

[johnnyh55]

Its also possible that the clips which secure the pads to the inside of the caliper piston and to the caliper are too small causing the pads to move around. Just pry back on those little tabs so they sit firmly in place.

For extra quietness, apply a thing layer of grease on the back of the shim, not the pad.

Ensure that the caliper bracket and caliper are secured firmly.

Oh lastly, did you make sure to bed the brakes?
Y a I did bed the brakes, I will put some disc brake quiet and see if it helps

[TheMAN]

were the rotors turned? If so, there will most likely be microscopic spiral grooves which is causing the pads to walk/dance back and forth against the holder clips, making a clunking noise... the proper way to turn rotors is to finish them with cross hatching using a rotary buffing tool of sorts, which prevents this from happening... if you bought new rotors, you will see this

[Girds]

check the caliper bracket bolts if they werent torqued properly then they could come loose and it could rattle, i found it has happened to me after installing new rotors and pads