Azrael91966669

ok i installed a c4 12" brake conversion less then 500 miles ago

the rotors are already warped and grooved on the inside faceing both rotors

also ever since the conversion my steering wheel shakes side to side slitly
and putting my foot on the pedal only makes that shakeing worse and the pedal palsates and pulls slitly to the right aswell

the shakeing is the worst when on the freeway it makes the dash shake

ive done an alinement and put new tires on
nothing has stopped the shakeing steering wheel

i had none of these problems before the conversion

ive checked my wheel bearings there fine ive checked everything

guy i got the brakes off of says the warpped rotors have nothing to do with the shakeing steering

only the palsating pedal

so what would shake the wheel ? shakes regardless of haveing the brake on or off just gets much worse as the brake is applied

and why would the rotors groove and warp in under 500 miles?
all components where new other then the spindles and hubs made from used rotors
new caliper carrier/calipers/rotors/and bearings
thanks in advance

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iTrader: (14)

are the brake calipers centered on the rotor? if they are off a bit there could be un-even pressure on one side on the rotor and this could warp them real quick.

Azrael91966669

i would assume they would be centered

when we installed them the rotors dragged only slitly i was told that was normal

blackcrow64

I thought they weren't supposed to drag at all?

Azrael91966669

freind of mine has the baer brake package same as what i have i just used factory parts and his drag same as mine

ebmiller88

iTrader: (7)

Warped rotors will cause the whole thing to shake, the guy you got the rotors from doesn't understand this, and from your description this sounds like your problem.

Did you use new pads? If the rotors are already grooved on the inner surface, the pads are shot or the carriers are rubbing the inside surface of the rotor. Give me a rundown of what parts you are using: bracket thickness, rotor, etc.

Ed

FASTERTHANUMARK

iTrader: (37)

Hey Ed,this setup hes got is 1/4" bracket w/ reg C4 brake calipers and carriers.The rotors are from the front of the 95 year vette I think.These parts are all new.Talking w/ him got me thinking of the 1/4" bracket and front rotor use and 3/8 bracket and the rear rotor is the way they are used,no?

ebmiller88

iTrader: (7)

I've been talking with him as well, he's been most helpful in clearing up his issue. Turns out that the inner side of the rotors are rubbing the caliper carriers. For all folks interested, I designed the 12" C4s to use a Corvette REAR rotor, not a front rotor. I found that there is a difference in total height of the two, a difference of 1/4" or so, give or take a few thousandths. It's covered in this thread:

https://www.thirdgen.org/forums/brak...ht=alternative

Now, I normally use a 3/8" thick bracket and a rear rotor for this setup. If one would want to use a front rotor which is 1/4" taller than the rear rotor, the rotor surface would be moved INWARD toward the spindle by 1/4". So take away 1/4" of that height from the thickness of a 3/8" bracket and this would leave you with a bracket 1/8" thick, WAAYYYYY to thin for safe brake use. I do think the 1/4" bracket would be safe but it's still not enough to keep it from rubbing the carrier. Azrael has two options as I see it: go to an HD hub which pushes the wheel and rotor out or swap to a set of rear Corvette rotors.

Ed

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iTrader: (14)

usually brake kits come with differnet sized spacers so you can align the calipers up correctly, i would assume that they should be with the kit and are needed? could be wrong. the rotors nut is tight and the bearings are good right?

Azrael91966669

ed was correct on the problem and also today one of the bolts that hold the caliper slider to the bracket flew off the car letting the caliper make contact with the rim on the drivers side

Azrael91966669

last photo shows how off set the caliper has been because of useing the incorrect rotor

ebmiller88

iTrader: (7)

Ouch...that's not good. Just make sure you check all your clearances when you reinstall everything.

Good luck!

Ed

jaykar

iTrader: (1)

If I remember correctly my Baer C4 kit came with a number of caliper spacers if I needed them.
I did

Later

ebmiller88

iTrader: (7)

The issue in his case is that the carrier or bracket needs to move in, not out, so spacers will not help him.

Ed

Azrael91966669

installed the "rear corvette rotors" and now all the problems are gone did have to use 2 washers for spacers but i think that is because of haveing a 1/4 inch bracket instead of a 3/8s one but for now all is well
i locktited the hell out of all the bolts

wesilva

iTrader: (35)

Is there a specific year of C4 12"rear rotor that must be used with Ed's kit?

ebmiller88

iTrader: (7)

'88-96 rear rotor.

Ed

wesilva

iTrader: (35)

Thanks, Ed.