New Pads/Rotors noises

[Bluemustang]

Hi all,

I didn't really want to post this up here because I was troubleshooting myself. But I decided now maybe I should seek some advice.

I did Steeda 2pc slotted rotors front&rear and GLOC GS-1 street pads and I am getting some noises. FYI I have the GT base 4 piston calipers up front.

1st, the GLOC pads didn't come with new shims for the front so I reused them. I didn't lube the back the pads or the shims the first time. The OEM shims look in pretty worn shape.

In troubleshooting the noise, this weekend I removed the oem shims, lubed the back of the pads and the caliper contact points, caliper guide pins, anti-rattle clip and re-installed. I also cleaned the caliper a little bit with brake cleaner.

1st - I was hearing a groan noise as I lightly release the pedal from stop or lightly apply as coming to a stop (very very slow speed). After pushing the car hard one day I started to hear some squealing at very low speeds at a certain pad/pedal pressure. Apply more pressure and it goes away. Then I started to hear it slightly when I am not on the brake at all. I know the pads (at least the rears) are supposed to touch the rotors somewhat at all times. I did check when I had the car up that rear wheels seem to move fairly freely, although it does take a bit of a push to move them.

After removing the shims and cleaning/lubricating things my groan noise is pretty much gone, but the squeal remains. Today I started hearing at low speeds when I turn the wheel.
I'm not really sure what I can do differently?

Are some of these noises normal? They are performance street pads and 2 pc rotors.

Just to recap -

1. Squeal at low speeds, either at a certain pedal pressure or with no brake applied at all.
2. Squeal when turning wheel at low speeds.

Zero sound driving at speed and applying brakes. No vibration or pulsating sensation from brake pedal. Car stops very well.

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[VinnAY]

Did you bed the pads after install, that procedure of 60-10mph hard stops, etc etc

 

[Bluemustang]

Did you bed the pads after install, that procedure of 60-10mph hard stops, etc etc

No. GLOC specifically said not to with these pads. If I try to bed them in they might glaze over.

 

[Bluemustang]

I just did several passes around the work parking lot using different pedal pressures and moving steering wheel back and forth trying to replicate.

1. Stationary - steering full lock to full lock - zero noise.
2. The brake squeal occurs at any light pedal pressure and I can replicate on command. More pressure and it goes away.
3. Sharp steering angle at low speeds I can hear a very slight squeal/squeak/chirp whatever you want to call it. Very slight. Harder to replicate but I did verify it's there. Most of the time steering back and forth though no sound.

 

[Roadway 5.0]

Anti-rattle clips have been the bane of my existence since working on cars many moons ago. I would start with replacing these before diving too deep on anything else.

 

[Bluemustang]

Anti-rattle clips have been the bane of my existence since working on cars many moons ago. I would start with replacing these before diving too deep on anything else.

Thanks, I will probably try that just for the hell of it. Technically, I believe you are supposed to replace all the hardware when doing a brake job. In case anyone is wondering: OPMustang has premium hardware for the front 4 pistons. Rockauto also has several options. It seems you can't buy shims without the pads. For some reason GLOC does not supply them; I'm thinking perhaps they don't want you using them. Other pads I've seen include the shims.

Edit: OPMustang has hardware for the rear brakes for the all GTs/Ecoboost PP.

 

[blown302]

I installed the same rotors and pads and reused hardware. I did bed in the pads [it says to on the box the pads came in] and I have no noise at all. I do have the Brembo brakes but it shouldn't matter.
can't figure why you have noise.

 

[Bluemustang]

I installed the same rotors and pads and reused hardware. I did bed in the pads [it says to on the box the pads came in] and I have no noise at all. I do have the Brembo brakes but it shouldn't matter.
can't figure why you have noise.

So you bedded the GS-1s?

 

[blown302]

yeah I did 4 stops from 60 to 30 waited a few minutes and did 4 more 60 to 30. It does say on the box "these pads should be bed in".

 

[NightmareMoon]

You can definitely glaze the GS-1 if you bed them too aggressively. My GS-1 pads only usually make noise if they got to hot and glazed.

Did you clean the rotors when you installed them, or did you leave them wet with anti-rust?

I'm running those rotors with the GS-1 (but in PP sizes). I did bed them in, actually I over did it a little. I also sanded my GS1 pads down a bit because they were old and contoured to match my old rotors, so I flattened them out on a belt sander after the initial bedding. They've been fine since that.

 

[Bluemustang]

You can definitely glaze the GS-1 if you bed them too aggressively. My GS-1 pads only usually make noise if they got to hot and glazed.

Did you clean the rotors when you installed them, or did you leave them wet with anti-rust?

I'm running those rotors with the GS-1 (but in PP sizes). I did bed them in, actually I over did it a little. I also sanded my GS1 pads down a bit because they were old and contoured to match my old rotors, so I flattened them out on a belt sander after the initial bedding. They've been fine since that.

Yeah I did clean the rotors prior to installing. I think what happened is I glazed them. Its possible also that they're dragging a bit too much on the rotors at least that's my theory. Have to get the car up and see.

 

[NightmareMoon]

Yeah I did clean the rotors prior to installing. I think what happened is I glazed them. Its possible also that they're dragging a bit too much on the rotors at least that's my theory. Have to get the car up and see.

Glazing is visible on the pad surface. It looks like a shiney streaky area compared to the rest of the pad. If you take one off and post a picture we should be able to tell if it looks glazed or not.

If it is, you can pretty easily sand off the surface glazing and it should be quiet again.

 

[Bluemustang]

I also hear grinding coming from the brakes (i think the rear) when i shift into reverse. This seems to be a smoking gun. It's got to be something with that sliding rear caliper. Need to get the car up to confirm.

I dont know how the rear caliper bracket could be misaligned once its bolted in, but I'm thinking that has to be it. Something is making contact with the rotor or its binding up somehow.

 

[NightmareMoon]

Make sure your metal dust shields aren't contacting the rotors. Its _really_ easy to accidentally bend those when you're working on brakes/rotors and they'll make an ungodly grinding noise until you bend them back clear of contact.

 

[Bluemustang]

Make sure your metal dust shields aren't contacting the rotors. Its _really_ easy to accidentally bend those when you're working on brakes/rotors and they'll make an ungodly grinding noise until you bend them back clear of contact.

Thanks, I will check that as well.

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