OK, i bought a set of those brembo slotted/cross drilled rotors (please no criticism i don't care if they work they were the same price as stock ).

My problem is that there is a metal clip on the inside of each rotor that is stuck in the vents if you look into the rotor from the outside of the circumfrence, here's a pic...



Do i need this? What is it?

I have a problem with braking between 50-40 mph where the wheel/brakes shudder...however only at these speeds.

Please help!

Vince

 

Hmmm, never paid attention to the inside of the vents. Does it look as if they're just stuck in there?

 

Usually good rotor manufacturers put clips on the vents in order to balance them. Your shuddering problem sounds like the rotors need to be resurfaced, but it sounds like you just bought them though so there shouldnt be a problem. I assume that you also changed pads when you changed rotors, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Swift &raquo;</TD></TR><TR><TD CLASS="quote">but it sounds like you just bought them though so there shouldnt be a problem.</TD></TR></TABLE>

Just because the rotors are new doens't mean they are flat or true. I have had to cut rotors on occasion that came right from the parts warehouse, when I didn't feel like waiting for them to send new ones. They can be warped for a number of reasons, one being they were not stored flat but rather on edge.

 

the shuddering problem is most likely your drums. or your pads, if they weren't replaced

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by racerxadam &raquo;</TD></TR><TR><TD CLASS="quote">

Just because the rotors are new doens't mean they are flat or true. I have had to cut rotors on occasion that came right from the parts warehouse, when I didn't feel like waiting for them to send new ones. They can be warped for a number of reasons, one being they were not stored flat but rather on edge. </TD></TR></TABLE>


i beleive that its acually recomended to have them cut before you use them.

 

wouldn't be a bad idea, I don't bother unless you can feel the pedal pulse during the test drive, if it doesn't I think it is perfectly reasonable to assume that particular set of rotors was stored correclty and is not warped.

 

Rotors are flat...the reason i can tell it because my shuddering is only in a 10mph range. If i'm braking from 90-55 they are smooth as butter and stop great. I think that the caliper slide pin is worn or the area where the caliper goes over the slide pin is worn on my drivers side. I think i'm just going to order new calipers either from honda or autozone rebuits. Anyone know prices for new/rebuilt calipers and where the best place to buy them is?

I think swift is right, i did some google searching and found some vauge topics on rotor clips for balancing. The thing that stumps me is that on brembo's site it says that they balance rotors by removing material from the outside of the rotors to eliminate the need for clips...and i know these aren't knock off's because with them i got a brembo install booklet and the rotors are stamped with part numbers...

Vince

 

since the rotors you bought were Redrilled from blanks, that could be why it needed to be rebalanced.

So i would say after the machine shop drilled and slotted them, they balanced it also.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Project91CRX &raquo;</TD></TR><TR><TD CLASS="quote">since the rotors you bought were Redrilled from blanks, that could be why it needed to be rebalanced.

So i would say after the machine shop drilled and slotted them, they balanced it also.</TD></TR></TABLE>

These were not re drilled and re slotted from blanks. Trust me i can tell by looking at them this is how they were made. Although i have been wrong before...

Vince

 

Brembo CrossDrilled/slotted rotors drilled by brembo should have a gold tint to it from the zinc plating.

So if your rotors are silver with cross drilled/slotted. It was most likely drilled by some company who bought brembo blanks to redrill.

 

the harmonics of the way that work, and different things spining is why it would only shake, at those speeds.. i've had this problem in most of the honda's i've bought, and by putting new rotors and pads that are true.. i never get a shake..
you gonna spend money for nothing, your rotors are warpped

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JonGP4 &raquo;</TD></TR><TR><TD CLASS="quote">the harmonics of the way that work, and different things spining is why it would only shake, at those speeds...
you gonna spend money for nothing, your rotors are warpped</TD></TR></TABLE>

OK, harmonics is a totally different thing here. Rotor warpage causes shaking at any speed (however more intense with increased speed). The reason is because as the rotor spins and the position of the face changes througout the rotation...your pads will also oscillate back and forth creating pedal feel and wheel shake. The faster you go the more intense the shaking because the frequency of the pads shaking with the warped rotor face increases...

Now, you say that it should only shake in a certain MPH because they are warped??? The only way it would shake at a certain MPH range is because at that point the rotating frequency approaches and meets the frequency of the "out of balance" rotor. The rotor could be perfectly flat on both sides and still out of balance.

I'm currently studying mechanical engineering and have done these calculations dozens if not hundreds of times.

Warpage and Balance are two totally different things...either that clip is for balance or it is not...chances are it is and something else is my problem.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Project91CRX &raquo;</TD></TR><TR><TD CLASS="quote">Brembo CrossDrilled/slotted rotors drilled by brembo should have a gold tint to it from the zinc plating.

So if your rotors are silver with cross drilled/slotted. It was most likely drilled by some company who bought brembo blanks to redrill.</TD></TR></TABLE>

You may be right however these drilled holes are zinc coated as well as the inside of the slots. In addition Zinc plating does not have to give a gold tint (or ever does now that i think about it?). Zinc is the same material used on galvanized steel and galvanized steel is shiny silver with some texture to it...as are these rotors.

Vince

 

I think I paid like $25 w/core swap from Autozone for my 88 passenger caliper. I ripped a piston boot and just replaced the whole thing.