Well There once was a guy named Suppy123, He had a set of brackets to upgrade the brakes on 88 Fieros using 88-94 front 12" Corvette rotors (non-HD) https://www.fiero.nl/forum/Forum4/HTML/027568.html The price was right and I got a set and stuck them on!
I paid $300 for 4 brackets and 4 rotors.( did the re-drill 5x100 myself) I got a deal on the brake lines at $50 for all 4 After getting the bolts, the whole project took about 1.5 hours to do.( 1 man)
I used the STOCK CALIPERS and the Emergency brake still works.
Ohhhh, I see, so it's stock 1 piston calipers, but a much larger disc (I'm kinda slow today!). Still, that's a hell of a deal, $350 + a drill job, that's not that much more then a new set of rotors and lines for all four corners.
-Rick
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11:56 PM
Sep 14th, 2005
88gtNewb Member
Posts: 922 From: Surrey, BC, Canada Registered: Aug 2004
One thing, not sure if you are using them or not, but when I got my 12" package it had hub centric rings, which I ended up having to remove because they would not let the rotor sit flush to the hub, so when the lugs were tightened then rotor caps would warp, causeing the rotors to warp and giving the car a really bad vibration. It started with the front drivers. Then next time the wheels were off it came back, and I removed the rears then the next time I had the wheels off it did it again, so I removed the last one and it was fine once again. Im not sure why they all didnt do it at once, I set them all to 100 ft lbs. But Im just saying if you get a vibration try taking them out.
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12:12 AM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
One thing, not sure if you are using them or not, but when I got my 12" package it had hub centric rings, which I ended up having to remove because they would not let the rotor sit flush to the hub,
Some time ago, several of us went together and had these brackets and centering rings made up and got our rotors drilled, at the same machine shop. One thing we did, was to have a chamfer turned into the inside bottom edge of the centering rings. The machinist took his time but he understood the situation.
With a new rotor, the straight sided rings will fit snug & square, but given some age, some corrosion, and some latent accumulation of dirt, the chamfer needs to be there. I can't imagine running without the rings.
As far as the drilling goes... The way to do it is to put the centering ring in the new rotors, then get a pipe ( same size as the hub size about a 2-3" dia. pipe piece). Then place a old rotor( 5x100) on the pipe that sticks through, that will center the rotor. move to inbetween the other holes on the new hub and dril 1 hole. then put a nut and bolt through that 1 hole to hold the roitors together and drill the rest of the holes ! not real hard. but better be dead on or you WILL feel it.
On the centric rings, there was not any problems with the rotor sitting flush. I even did a little bit of tapping on the ring to "seat" it in well. so far so good ! I will remove if needed! thanks for the tip!!
Aus..... Check that ebay site for the rotors, they seem fine, and cheap
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09:22 AM
Marvin McInnis Member
Posts: 11599 From: ~ Kansas City, USA Registered: Apr 2002
Hmmmm. These appear to be two different rotors. Comments?
I have to admit that for engineering reasons I'm not a fan of aftermarket drilled and/or slotted rotors. If you're like me, you can buy genuine GM Corvette rotors (GM #18027889, AC/Delco #18A289) from GmPartsDirect.com for about $51 each ... including shipping.
In addition to Sluppy123's brackets and the Corvette rotors, you will need eight bolts to attach the four brackets to the Fiero knuckles; 12 x 1.75 mm metric cap screws (10.9 grade) 25 mm long. The conversion will move the rear calipers down about an inch, so if your rear brake hoses are already pretty short it will make things even worse. Most aftermarket PTFE/stainles braid hoses sold for the stock '88 Fiero will definitely be too short for this conversion. Refer to the picture below of a stock caliper/rotor installation and also see https://www.fiero.nl/forum/Forum2/HTML/066568.html for a more detailed discussion of the issues.
[This message has been edited by Marvin McInnis (edited 09-14-2005).]
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10:52 AM
newfie Member
Posts: 711 From: Back on the Rock! Registered: Apr 2000
I did the swap a while ago, with the group buy a bunch of us did here on the forum. I bought new ss brake lines and they were long enough. The only problem I did have is the new rotor rubbed on the LCA on the front drivers. I posted about it and found out I wasn't the only one with the problem. If you notice the 'vette rotor is deeper than the stock and sits closer to the suspension. I had also rebuit my suspensioin so my alignment was way off. I ended up rubbing a bit of metal off the the lca to clear the rotor enough to drive it. At least to get it to an alignment shop. No problems since though. Just a heads up to anyone doing the swap, if you hear a metal on metal scrapping comming from your front end, thats probably the problem.
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12:38 PM
86GT3.4DOHC Member
Posts: 10007 From: Marion Ohio Registered: Apr 2004
Originally posted by 86GT3.4DOHC: If anyone needs bolts for the swap, let me know, Ive got TONS of extras I think I bought 25 packs. They're brand new, socket head cap screws
OHHHHHH NOW YOU TELL ME !!!!
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09:15 PM
blackrams Member
Posts: 32036 From: Covington, TN, USA Registered: Feb 2003
I did this conversion about 18 months ago on my 4.9, bought two more sets for other cars when I got the time an inclination. What I can say is that this is one hell of a lot of bang for the buck, the difference is unbelieveable when switching from my 4.9 converted C4 brakes to a stocker. I was one of the group that Dave above is speaking of. Simply unbelieveable!
------------------ Ron Freedom isn't Free, it's always earned. My imagination is the only limiting factor to my Fiero. Ooops forgot about the money issue.
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09:23 PM
SNMFX Member
Posts: 436 From: Los Angeles, CA 90026 Registered: Mar 2004
Originally posted by 86GT3.4DOHC: If anyone needs bolts for the swap, let me know, Ive got TONS of extras I think I bought 25 packs. They're brand new, socket head cap screws
where did you get them, cause i'm going to need 16 of them.
thanks, thomas...
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10:06 PM
PFF
System Bot
Rickady88GT Member
Posts: 10648 From: Central CA Registered: Dec 2002
I'm confused. I thought with 88 fieros the only thing you needed to replace was the rotors. I thought they would work with the stock calipers witout the use of a bracket. I thought only the pre-88 fieros needed an adapter setup. Am I understanding this incorrectly?
Or is it that to make the 88's work with no adapter you use rotors from an 87 corvette, but to get use of an 88 corvette rotor you have to have the adapter. Is that it?
Doh! Ok, I have read and read and read on this and apparently now I'm back to square one. I have an 88 and an 87 I want to upgrade(88 first). Someone paint a picture for me please.
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04:10 AM
blackrams Member
Posts: 32036 From: Covington, TN, USA Registered: Feb 2003
Originally posted by enthashyt: I'm confused. Someone paint a picture for me please.
I'll try, first and foremost, this particular upgrade will only work on the 88 Fiero. You have to use an adapter plate because the C4 Corvette Rotors will force you to move the caliper in 3/8 of an inch and out due to the increased size of the rotor over stock. You will need twice the number of bolts with this upgrade because now you're bolting the adapter plate where the calipers used to mount and then mounting the caliper (relocated) to the adapter plate but 3/8 of an inch further in and much farther out from the center of the hub. Though you can use the old stock rubber brake hoses, I highly recommend you replace them with slightly longer steel braided lines, I learned this the hard way. That help? I assure you, if you do this brake brake rotor conversion, your Fiero has never had the stopping power you are about to expereince.
------------------ Ron Freedom isn't Free, it's always earned. My imagination is the only limiting factor to my Fiero. Ooops forgot about the money issue.
I'm confused. I thought with 88 fieros the only thing you needed to replace was the rotors. I thought they would work with the stock calipers witout the use of a bracket. I thought only the pre-88 fieros needed an adapter setup.
.
Okay here is the picture:
The 88 will work with the stock calipers, but the rotor is over an inch larger, you need the adapter to move the caliper out or else it wouldn't fit.
The 84 to 87 you need to change the calipers, as the new rotors are significantly thicker, and I believe on the front you have to have the front rotor ground down to just a hub and the rotor goes over top of that.
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07:09 PM
Sep 16th, 2005
Racingman24 Member
Posts: 2304 From: Land of 10,000 Idiots Registered: Apr 2003
Hey Rickady, Do you know how long your rear hoses are. I just got mine from the Fiero Store, and just want to make sure they are the correct ones before I try to put them on.
They are the Ocelet Brand. Two of them are a bit longer, I just want to be damn sure.
Eric
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10:59 PM
Sep 17th, 2005
Rickady88GT Member
Posts: 10648 From: Central CA Registered: Dec 2002
Cool, that means I got the right ones. I just measured mine, and they are like 20" from tip to tip, and about 18" of just hose.
Sweeet, I get to put them on.
Don't forget that the long ones are for the front. I got custom rear lines only. The fronts are a great fit as they are sold, but the shorter of the lines are for the rear and were to short. I talked to them on the phone and got them to open up a set and measure the rears. Sure enough, they were the same length as the first set of SS lines that I got from another vendor that were to short. So I asked if I could get a set that was the correct length and they sent them out to me
Look close and you can see three rear brake lines in this pic. They are tied together. One line is stock, one line is the standard length SS rear line and the third is the custom Fiero Store SS line.
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03:12 AM
California Kid Member
Posts: 9541 From: Metro Detroit Area, Michigan Registered: Jul 2001
where did you get them, cause i'm going to need 16 of them.
I purchased socket head cap screws from McMaster-Carr ; part number 91290A616, $8.44 for a pack of 25. These are hex head, grade 12.9, M12 x 1.75 cap screws with a black oxide finish.
quote
Originally posted by California Kid:
What happened to Suppy123 ??? Is he still making these parts ? Haven't seen him post in a while.
He's still around, and he is also very good at responding to inquiries. I purchased a set of '88 brackets from him within the past month. Even though I told him I wasn't in a hurry, I still had my brackets within three or four days.
[This message has been edited by Marvin McInnis (edited 09-17-2005).]
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10:07 AM
Rickady88GT Member
Posts: 10648 From: Central CA Registered: Dec 2002
I'm still making the brackets and centering rings to do this swap, PM or e-mail me if interested. I don't keep them is stock but make them as they are ordered.
revin- How much clearance do you have between the outside diameter of the rotor and the bridge of the caliper? Any grinding required on the caliper to clear the rotor? I've had a couple people that had to remove some casting flash so it wouldn't rub.
Don't forget that the long ones are for the front. I got custom rear lines only. The fronts are a great fit as they are sold, but the shorter of the lines are for the rear and were to short. I talked to them on the phone and got them to open up a set and measure the rears. Sure enough, they were the same length as the first set of SS lines that I got from another vendor that were to short. So I asked if I could get a set that was the correct length and they sent them out to me
Look close and you can see three rear brake lines in this pic. They are tied together. One line is stock, one line is the standard length SS rear line and the third is the custom Fiero Store SS line.
Ok, one more question then, how long are your front ones?
I'm still making the brackets and centering rings to do this swap, PM or e-mail me if interested. I don't keep them is stock but make them as they are ordered.
revin- How much clearance do you have between the outside diameter of the rotor and the bridge of the caliper? Any grinding required on the caliper to clear the rotor? I've had a couple people that had to remove some casting flash so it wouldn't rub.
no but REAL close, just a tad bit closer trhan the stock rotors clear. I did not grind anything
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01:21 PM
Rickady88GT Member
Posts: 10648 From: Central CA Registered: Dec 2002
zinc plated too!
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