New brakes make grinding/shuddering noise when almost stopped. - Pontiac G6 Forum
 
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post #1 of 7 (permalink) Old 07-18-2012, 09:38 AM Thread Starter
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New brakes make grinding/shuddering noise when almost stopped.

So I just put on new rotors and ceramic pads myself for the first time today! yay! But once I tightened everything back up and did a road test, I'm no longer happy. The brakes, when almost stopped (low speeds), will shudder/grind to a stop. Its very unnerving because the mirrors shake and everything.

Is this normal for new pads and rotors? I cleaned everything with brake cleaner, all the padsare in the correct spots and I pumped the brakes before I drove it. I looked at the brake fluid level and it seems to be a tad low (maybe 1/2" or so). Could this be the problem? Or did I just massively mess something up?

Any help is appreciated!

btw, I am using ceramic pads with slotted rotors from r1concepts(all brand new).

MODS : 35% tint front, 25% rear, CRABS CAB, K&N cone filter, Racingline strut tower bar, painted calipers silver, LED replacement bulbs in tails with resistors, upgraded wheels to 18" GTP wheels.

To come : cross-drilled/slotted front rotors, exhaust(?), LED interior bulbs, lowering springs(?), LED third tail.

Last edited by patricktt; 07-18-2012 at 09:43 AM.
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post #2 of 7 (permalink) Old 07-18-2012, 11:34 AM
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Sounds like your fluid is within spec.
Is it a loud grinding sound?

I never worked with slotted rotors but it sounds to me like the brakes just need to break in. You may be feeling the pads just running through the slots as you come to a stop. I've read about users saying they make a weird sound when braking at low speeds.

If nothing seems out of the ordinary then I would recommend driving a little bit and get the pads and rotors to seat with each other and fully brake in. As long as there is obviously nothing negative, like you can see something grinding or etching into the rotor.

I'm assuming when your at speed and you apply the brakes they work and sound just fine, only once u get to a stop it makes the noise, which makes me lean towards them just needing to be broken in.

Hopefully someone with slotted rotors can chime in and give more info.
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post #3 of 7 (permalink) Old 07-18-2012, 03:58 PM Thread Starter
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good call on the breaking in. After driving around for a bit and doing some moderate 30-5 stops and 60-30 stops, the shuddering has gone away! The pedal feels a bit mushier than normal so ill have to keep an eye on that (maybe top off the brake fluid?). But so far so good! Thanks!

MODS : 35% tint front, 25% rear, CRABS CAB, K&N cone filter, Racingline strut tower bar, painted calipers silver, LED replacement bulbs in tails with resistors, upgraded wheels to 18" GTP wheels.

To come : cross-drilled/slotted front rotors, exhaust(?), LED interior bulbs, lowering springs(?), LED third tail.
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post #4 of 7 (permalink) Old 07-18-2012, 04:48 PM
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if the pedal is still mushy you may have air in the system, so you might want to bleed your brakes.

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post #5 of 7 (permalink) Old 07-18-2012, 05:47 PM Thread Starter
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Ok is that as simple as opening the bleeder valve on each caliper and depressing the pedal until only straight fluid comes out?

MODS : 35% tint front, 25% rear, CRABS CAB, K&N cone filter, Racingline strut tower bar, painted calipers silver, LED replacement bulbs in tails with resistors, upgraded wheels to 18" GTP wheels.

To come : cross-drilled/slotted front rotors, exhaust(?), LED interior bulbs, lowering springs(?), LED third tail.
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post #6 of 7 (permalink) Old 07-18-2012, 07:45 PM
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Basically yeah.... if your not sure just do a little research, maybe some you tube videos. Its pretty easy.

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post #7 of 7 (permalink) Old 07-18-2012, 11:57 PM
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Bleeding is fairly easy, You can even do it with a small vacuum pump.

It is possible you still have some break in room to go. I did my brakes and they felt a little mushy until the pads fully seated. You can tell by looking at the rotors, Especially the rears, The pads contacted towards the edges but not towards the center of the rotor. That little bit of space multiplied by all the pads on all the wheels can give you that little bit of a mushy feeling.

But bleeding the brakes and adding new fluid is never a bad idea.
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