UFO brake question

[Bernie Benz]

I have 225K on my original UFOs and never had any shake problems as  
they are dead true. ( Original owner did have UFOs replaced once  
under warranty at low mileage.) But I am very gentle with my brakes.  
All rotors, even UFOs, will wear true and be better than new, runout  
wise, if normalized at a temperature above the highest operating temp  
to eliminate warping.

You must put a dial indicator on the rotor surface and quantify your  
run out, and the high and low side. The original factory run out is  
etched into the hub area of the rotor. You can then cut paper shims  
of appropriate thicknesses to go under 3 or 4 of the 5 bolt areas to  
get the runout under 0.002“ TIR, the max runout spec. BTDT with  
conventional Lancia rotors when I was too cheap to buy new. UFOs are  
keyed to their hub by the torque plug, a real plus if not mixed up  
side to side. On conventional rotors i always center punch mark the  
hub and rotor such that rotors always go back on their respective hub  
in the same orientation to retain the zero run out.

Bernie


On Apr 30, 2008, at 2:12 PM, db cornett wrote:
> Troops,
>
>        Don't get me wrong.... I like the performance of the UFO  
> brakes on my '91 2C20v.  Especially with the Porterfield R4-S pads  
> I use on the street.
>
>        The problem is the steering wheel shakes when the brakes are  
> applied.  Warped rotors is my guess too.  I've gone through 4 sets  
> (2 used, 1 reconditioned, 1 new OEM) of UFO rotors in the last 3  
> years.  2 years ago I replaced all the suspension bushings and  
> strut mounts with OEM.  I also replaced the rack rod ends at that  
> time.  I was using Pagid Reds then.  In an attempt to sort this out  
> I went to the R4-S pads when I installed a new set of OEM rotors  
> last year.  I bedded in the pads as per Porterfield  
> recommendations.  I've triple checked all fastener torques, made  
> sure the rotors were mounted to rust free, clean mating surfaces on  
> the hubs.  The calipers are free to slide on their mounts and the  
> caliper pistons are rust free and stroke just fine.  The front end  
> alignment was checked last month and is in spec.  I am using H&R  
> springs with Bilstein HD's.  Oh yeah, I've got 197k miles on the  
> clock... it starts quickly and pulls hard to 7000erpm (MTM chip &  
> waste gate
>  spring).  I don't baby the brakes.  I get them smoking HOT every  
> once in awhile trying to sort this out.
>
>        So with all that explanation.... does any one have first  
> hand experience solving this problem with the UFO's?  Other than  
> installing a BIRA system or someone elses version of the same.
>
>        Cradle mounts?  Strut mounts shot?  Pad material transfer?   
> Anything?  Anyone?  Bernie?
>
>   Cheers, Doug
>
>
>
>
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