vented rear discs

[Mike Kopstain]

I'm having a brain fart. 1994 is the first year they started using non-vented rear discs right?

 

[twr]

Mikeys_Taurus:
I'm having a brain fart. 1994 is the first year they started using non-vented rear discs right?

Mid production year 92' I believe.

 

[Mr Anonymous]

twrsho:
Mid production year 92' I believe.

Correct!

 

[Mike Kopstain]

You bastards... you unknowingly just a created a lot more work for me. damnit!

 

[blewbyu]

Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

 

[Mr Anonymous]

blewbyu:
Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

The rear brakes only provide approximately 20-25% of the total braking at best, so they never get hot enough that a vented rotor would be needed to dissipate heat. The front brakes do most of the real work.

 

[Mike Kopstain]

SHOooo:

blewbyu:
Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

The rear brakes only provide approximately 20-25% of the total braking at best, so they never get hot enough that a vented rotor would be needed to dissipate heat. The front brakes do most of the real work.

But if you were to, by chance, plug the rear bias valve that additional heat dissapation would help greatly. This is why I asked.

Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

We are putting together a kit that will come with plugs for the bias valve, new vented rotors, pads, and new rear caliper brackets. There is a nice difference. It will work on any 92' - 99' SHO. I will give some additional info in the coming week when I pay Mr. Raciti for our banner ad.
I upgraded my car from rear drums to disc, and then upgraded to vented disc when I plugged the bias valve. The rear wheels still get quite hot.

<small>[ December 19, 2002, 07:02 PM: Message edited by: Mikeys_Taurus ]</small>

 

[pjtoledo]

blewbyu:
Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

Absolutely none of the parts interchange between rear vented and solid systems. Not the rotors, not the pads, not the calipers, not the brackets, not the mounting plate the bracket attaches to. The only parts that are the same on both systems are the spindles, E brake cables, and the ABS sensors. Even the hubs are different, they are different thicknesses to keep the wheels positioned the same because the hat/wheel surface of the rotors are different. Solid rotors have a thick hat, vented a thin hat. Not the 89s, thick rear hats for them too. But the two hubs are so close it won't matter in most cases.

Perry Toledo,Ohio

 

[Mike Kopstain]

pjtoledo:

blewbyu:
Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

Absolutely none of the parts interchange between rear vented and solid systems. Not the rotors, not the pads, not the calipers, not the brackets, not the mounting plate the bracket attaches to. The only parts that are the same on both systems are the spindles, E brake cables, and the ABS sensors.

Actually if you use rotors from an 89 with 89 - 91 caliper brackets you are fine. As I said above, my car had non vented rotors to begin with. I changed the rotors and the caliper brackets when I upgraded. I have some pics also.

 

[blewbyu]

Thank you for the info, Mike yours especially is helpful, In the next few months I plan to do some major brake upgrades, and want something better in the rear, maybe this will work for my rear, If nobody buys my 89, I am going to strip it and use the parts off of it, if they take it, I will go with some sort of aftermarket. Craig

 

[DeaconBlue]

The only time that a Gen II/III will need upgraded and/or vented rear brakes if you have upgraded the front brakes beyond the 11.6" '96 front setup AND have full fluid flow to the rear calipers via. replacing the pin assemblies in the rear load proportioning valve with plugs.

Don't believe everyone that tells you that the rears only do 20-30% of the braking so they don't need upgraded. If you have done both a big front brake upgrade and have done the plugs vs. pins mods, you can take advantage of a rear brake upgrade, even on the street. Plus it helps to maintain the overall braking balance of the car. As far as on a road course, well just ask all those people that had big front brakes and didn't upgrade their rear brake, why they were the only ones that were bleeding their brakes between every session at Summit Point at last years convention wink

<small>[ December 20, 2002, 04:52 AM: Message edited by: DeaconBlue ]</small>

 

[pjtoledo]

Mikeys_Taurus:

pjtoledo:

blewbyu:
Which is better, in the sense of I like to brake hard, and was wondering if I could put the vented on the 93 from the 89 or are they totally differant. The 89 is no abs, as the 93 is, of course. Just wondering.Craig

Absolutely none of the parts interchange between rear vented and solid systems. Not the rotors, not the pads, not the calipers, not the brackets, not the mounting plate the bracket attaches to. The only parts that are the same on both systems are the spindles, E brake cables, and the ABS sensors.

Actually if you use rotors from an 89 with 89 - 91 caliper brackets you are fine. As I said above, my car had non vented rotors to begin with. I changed the rotors and the caliper brackets when I upgraded. I have some pics also.

How did you handle the mounting holes for the caliper brackets being about 1/4" farther apart on the backing plate when going from solid to vented?? At least thats the way it is on my solid 95 and vented 92.

Perry Toledo,Ohio

 

[tomw]

You have to switch the "backing plates" also.

Tom W
Red 93 ATX
Black 92 MTX

 

[pjtoledo]

tomw:
You have to switch the "backing plates" also.

Tom W
Red 93 ATX
Black 92 MTX

That is correct, the bracket holes in the mounting plate for the solid system are 90mm apart center to center, for the vented they are 97mm,,,center to center. That takes us back to my first post stating that none of the brake parts are interchangable. The ABS sensors are usually rusted in, I have had no luck removing them intact and just get new ones from NAPA.

Perry Toledo,Ohio

<small>[ December 21, 2002, 12:30 PM: Message edited by: pjtoledo ]</small>

 

[Mike Kopstain]

DeaconBlue:
The only time that a Gen II/III will need upgraded and/or vented rear brakes if you have upgraded the front brakes beyond the 11.6" '96 front setup AND have full fluid flow to the rear calipers via. replacing the pin assemblies in the rear load proportioning valve with plugs.

Don't believe everyone that tells you that the rears only do 20-30% of the braking so they don't need upgraded. If you have done both a big front brake upgrade and have done the plugs vs. pins mods, you can take advantage of a rear brake upgrade, even on the street. Plus it helps to maintain the overall braking balance of the car. As far as on a road course, well just ask all those people that had big front brakes and didn't upgrade their rear brake, why they were the only ones that were bleeding their brakes between every session at Summit Point at last years convention wink

Correct! We will be offering a full kit that will come with bias valve plugs, vented rotors, caliper brackets, and pads.

I will have to make myself a part number spreadsheet. On my car I went from solid to vented and just changed the caliper bracket. So perhaps they changed throughout the years.

 

[SHODWN]

Hey John thinnk my 4 piston Wilwoods will be too much in the rear?

John is so correct about a back brake upgrade, after you do the fronts. I dont have the plugs but I adjusted the valve in the back using the stock 97 brakes for now and makes a huge difference.

John got a good deal on Eradispeed rotors yet? I need some..

 

[SHO92]

My May 92 build date SHO had the vented which are now on my November 92 build date 93. All 92s should have vented rotors and all 93 and newer should have solid rotors unless it was changed by one of the owners.

 

[Xs SHO 1]

so how much for this kit?

 

[Mike Kopstain]

I'll talk to you on AIM Zy. I don't want to talk price until I pay Greg for advertising.