New sound/feeling

[NavyMan86]

So, I got the brakes and rotors replaced after an arduous 5hr odyssey on the base's auto hobby shop. The pads were virtually new even though I haven't touched them in the 20k miles I've had the car, but the rotors were gouged up on the inside, especially in the rear. All's well though.. kinda.

 

The brakes felt great for the first few days, and now it's beginning to make a low-pitched hum/vibration noise.

 

The easier I brake, the more noticable it is. The harder I brake is the inverse.

 

I'm wondering if my front calipers have gunk in the brake lines? (I didn't bleed them once I finished up, probably should have) Or perhaps a caliper isn't sitting quite evenly and is causing it to bounce off of the rotor causing the humming/vibration?

 

My only other thought is that they're (the pads) just being "broken in" and wearing off that top, stale layer.

 

Any suggestions..?

[apexi]

What pads and rotors were installed? Did you do any sort of bed-in procedure after installing them? And if you didn't bed the pads, have you been really hard on the pads or anything like that? I'm thinking either something with a brake pad shim vibrating, or pad deposits on rotor. If it was just something you heard, I'd say probably the shim. But I'm leaning towards pad deposits on rotor since you mention a vibration feeling when you brake.

[NavyMan86]

Wagner brand of both. I didn't go all out and get slotted/drilled rotors or ceramic brakes. I just want the damn thing to stop =]. I didn't do any sort of bed-in procedure. Sooo I'm guessing that's what it's coming from, the deposits on the rotor. Isn't that the 60-5 hard braking 10 times, then letting them cool for 30minutes?

[JmP6889928]

If you've been driving it without bedding in the pads then you SHOULD clean the rotor surface to make sure you're starting with no deposits. Take some 80 grit sandpaper and go around the face of the rotor making light straight scratches at an angle to the surface and then turn around and go the opposite way to make a cross hatch pattern. Do this on both rotors inside and outside, reassemble the brakes, and then go and drive the car.

 

Bed the pads into the rotors:

4-5 hard stops from 35 m.p.h. without completing the stop (let it roll through just as it's about to stop so you don't plasma the face of the rotors)

2 hard stops from 70 m.p.h. and same as above-roll through

2-3 more hard stops from 35 m.p.h. as above and then drive the car for about 15 minutes without hitting the brakes if possible. This will allow the rotors to cool and equalize and then you should be all set.

 

Good luck.

[AZP Installs]

Also you should be flushing your brakes every 3yr/30k whichever comes first.

 

On the gouging, did you notice if the pistons were difficult to push in when you did the pads? Also did you lube up all the sliders etc? Sometimes we see the wear indicators bent in the box during shipping which can also lead to an issue like this.

 

-Mike Paisan

 

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