Georgia Fiero Club Forum

All Things Fiero => General Fiero Discussion => Topic started by: scottb on June 19, 2018, 08:38:19 pm

Title: Rotors
Post by: scottb on June 19, 2018, 08:38:19 pm

I need some tribal knowledge...."cleaning" up my pile of ..... stuff, and I came across 2 front rotors and 3(?) rear rotors. Are the specs the same? The fronts mic'd at .430, are those boat anchors? 2 rears mic'd out at .510 and 1 was .450. What say the tribe?

Title: Re: Rotors
Post by: Fierofool on June 19, 2018, 09:16:19 pm

The front and rear are (Edit:  NOT) the same specs.  The minimum cut may be inside the bonnet. 

Title: Re: Rotors
Post by: GTXVette on June 20, 2018, 01:36:02 pm

scott the min. spec number should be cast inside the hat.

Title: Re: Rotors
Post by: GTRS Fiero on June 20, 2018, 10:16:17 pm

I know '88 rotors are the same, but I am curious if the other rotors are the same.

Title: Re: Rotors
Post by: scottb on June 21, 2018, 06:19:52 am

I found my 84 factory service manual, it says. 44 minimum. The front rotors say 9.5mm, which converts to .375, .065 less than the factory spec. I think I will stick with factory specs and toss these. There is no spec cast into the rear rotors. I also found a set of rear calipers if anyone wants to try to rebuild them.

Title: Re: Rotors
Post by: GTXVette on June 21, 2018, 07:16:00 am

Scott, I will eventually use some of the corvette brakes and rotors I have and have extra sets, If ya wanna STEP UP, trade some if ya want.

Title: Re: Rotors
Post by: Fierofool on June 21, 2018, 08:41:15 am

I was wrong.  I would have thought that the front rotor would have at least been thicker if not equal, since it's the one that does most of the stopping. 

Rear Rotor:
Discard Thickness (mm):   10.9
Initial Thickness (mm):   12.6

Front Rotor:
Discard Thickness (mm):   9.5
Initial Thickness (mm):   11.1

Title: Re: Rotors
Post by: Raydar on June 21, 2018, 12:21:32 pm

I've got a full set of 88 rotors. I haven't mic'd them, but they don't look badly worn.
If anyone wants them, come get 'em. Or I can bring them to a meeting.

Title: Re: Rotors
Post by: scottb on June 21, 2018, 04:47:38 pm

Thanks John, but I dont think I am going to mess with the brakes