Slotted Rotor Feedback?

[tlong]

Recently I'm getting a bit of vibration from the rotors. All are slotted and drilled Raybestos. The braking is great, no judder, but I can feel the slots flying around at hard braking. Anyone else? Please say yes.

 

[wilezcoyote]

Baer Eradispeed

I put the Baer Eradispeed kit that comes with drilled & slotted rotors on mine in March. I haven't noticed any shudders, judders, or other weirdness. It will STOP with authority now. The braided stainless steel brake lines do make the pedal a lot firmer.

Did you "season" the rotors and pads after you installed them? The Baer setup came with detailed instructions on how to properly breakin the pads and rotors.

 

[Ken]

... I can feel the slots flying around at hard braking.

Eh? I do not understand that statement. :confused

 

[tlong]

Better description: Medium speed braking produces slight high frequency vibration you can feel in the pedal. Kind of a grind? I was wondering if slotted rotors had this characteristic. It's not from warpage...been there. Smooth at low speed. Yes I seated everything.

If this is abnormal to slotted and drilled rotors I'll pull the wheels and check them. Only 1000 miles on the new setup. They stop exceptionally well, but the slight vibration is a small concern.
Thanks.

 

[Ken]

The symptoms you're describing Tim, do not sound right to me. There shouldn't be any shudder, or grinding noise whatsoever. Somethin' ain't right!

 

[tlong]

Thanks Ken. Guess I can stop deluding myself thinking that's how 'racing brakes' feel. I did it all myself and really took my time. These are EBC Greenstuff pads, the dustiest pads on earth. The rotors are already rusted at the edges and hat Raybestos Brute Stop.

I'll need to look them over. It's so soon with all new components to be troubleshooting. Oh well. Thanks. I thought maybe a tiny bit of vibration was normal. I heard that somewhere before.


tlong

 

[Ken]

As has already been suggested, have you "bedded" the pads properly? I'm unfamiliar with those pads, it is possible I guess that some pads will be noisier than others of course, especially when cold.

 

[tlong]

I did the procedure they recomended for bedding in. They are not noisy at all; no squeeks or groans. It's at about 70-80 and apply pressure there is some vibration. Not like warpage, like the surface isn't smooth. Since it's full of holes and grooves that is my assumption.

I may throw some ceramics on there. I put them on the Expedition and man they are fantastic feeling on the 3 ton bohemoth. Great range on the pedal. Near dust free. The EBC dust bomb stains the wheel clearcoat I'm finding out.

Cheers

tlong

 

[Redmanf1]

Just because they are new does not mean you did not get a bad rotor. Some times after a little heat they will show up. Some aggressive pads do make a light noise when applied.

 

[Rain]

What did it cost to put em on the Expedition?

Thats one thing I notice on mine (an 03 model bauer) and every other one on eh road.. the front wheels are black as pitch!
Those front brakes are working over time to stop those monsters.

I did the procedure they recomended for bedding in. They are not noisy at all; no squeeks or groans. It's at about 70-80 and apply pressure there is some vibration. Not like warpage, like the surface isn't smooth. Since it's full of holes and grooves that is my assumption.

I may throw some ceramics on there. I put them on the Expedition and man they are fantastic feeling on the 3 ton bohemoth. Great range on the pedal. Near dust free. The EBC dust bomb stains the wheel clearcoat I'm finding out.

Cheers

tlong

 

[tlong]

Rain, they weren't any different cost than carbon metallic. I bought them at Autozone and had my guy do it. He charged me $100. The pads were about $150 for all four. He said Wagner was the best. The characteristics are very different in a good way.

It has me thinking about the vette. The C5s use them stock I believe.

Redman, I'll check for run-out soon. These are considered aggressive.

Thanks

tlong

 

[Topless]

I agree that there should not be any feel from the slots. They should run true.
Good to know about the pads. I run SBC / Baer (same pad) blue pads. They are a more agressive pad. They start to squeek some after daily driving. A hard stop or two, and they don't make a sound. I put them on when I upgraded from 12" to 13" (and drilled). This thing stops on a dime, and gives you change.

 

[Hib Halverson]

If you're feeling vibration when on the brakes, either your rotors are warped or they have cementite deposits on them. Either way you need to have the rotors machined and, in the case of cementite issues, even machining sometimes does not eliminate the problem.

I'd set-up to measure rotor run-out and/or non-parallelism as discussed in the service manual. If you come up with zero there, assume they've got "hard spots" of cementite.

Also, if they are warped, you sometimes can feel that in the steering wheel vibrating, side-to-side. If you've got cementite problems, you feel that, not though the steering wheel, but at very slow speeds and light braking, just as you come to a stop...you'll preceive a fluctuation in the deceleration rate.

Keep in mind that warped rotors set of a vibration in the laterally and cementite, or hard spots, set up a vibration longitudinally.