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post #1 of (permalink) Old 06-17-2002, 12:55 PM Thread Starter
 
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GM 14 bolt rear disk brakes?

Howdy Y'All,

I just finished reading this article: http://www.off-road.com/chevy/reviews/tsm/
and I am curious about something. How did TSM get over the problem of rotor thickness?

My research has revealed that a standard GM 3/4 front rotor is 1.285" thick and a 1976-78 Caddy rear rotor is 1.205" thick. This means that the 1976-78 rear disk caliper cannot grab ahold of the GM 3/4 ton rotor unless there's some sort of magic happening here.

Has anyone out there made this mod to their rig?
Would you care to share your observations with me?

Thanks in advance!

Zeke
www.fourwheelstampeders.ca
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post #2 of (permalink) Old 06-17-2002, 02:47 PM
 
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Re: GM 14 bolt rear disk brakes?

If I'm reading what you wrote correctly, then you are talking about a difference of .08", which is just over 1/16". This is an insignificant amount. The caliper probably has about a 1/2" to 3/4" of stroke. As your brakes wear the caliper closes up to compensate to keep the same gap between the brakes and the rotor. This all taken into account, that .08" doesnt really matter. I hope that i explained that well [img]images/icons/smile.gif[/img]. After reading over it i think that i confused myself [img]images/icons/laugh.gif[/img].
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post #3 of (permalink) Old 06-17-2002, 03:21 PM
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Re: GM 14 bolt rear disk brakes?

It doesn't matter anyway according to his information. Since the truck rotor is actually wider it doesn't matter as long as the rotor will fit in the caliper with pads on it. Since people have been doing this for aeons, apparently they do fit.
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post #4 of (permalink) Old 06-17-2002, 03:36 PM
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Re: GM 14 bolt rear disk brakes?

<font color=blue>The kit in that article uses F250 rotors- not chevy rotors. I have the same setup, it all works just fine
post #5 of (permalink) Old 11-03-2002, 04:21 PM
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Re: GM 14 bolt rear disk brakes?

did you ever get the info you needed on this question?
do they take the pad down or alter the caliper to open it up?
post #6 of (permalink) Old 11-03-2002, 04:54 PM
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Re: GM 14 bolt rear disk brakes?

It works fine the way it is. Since you managed to find this, search some more and you'll find that no one has had a problem. Once you've done that go to coloradok5.com and search their forums and you'll find the same results.
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post #7 of (permalink) Old 11-03-2002, 09:00 PM
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Re: GM 14 bolt rear disk brakes?

I've got the TSM kit and it works pretty good. Bolted right on.
post #8 of (permalink) Old 11-03-2002, 10:17 PM
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Re: GM 14 bolt rear disk brakes?

like Zeke was asking, the rotor is wider then the caliper will openup...so eather they cut the pads down of did a mod to the caliper.
the rotor is 1.250" wide
the caliper opens up to 1.200" wide
so they had to mod. something..
post #9 of (permalink) Old 11-03-2002, 10:21 PM
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Re: GM 14 bolt rear disk brakes?

the main reason I'm asking about this issue is I have found a caliper that is a lot cheaper with a parking brake, but it only opens up to 1.100", so I'm thinking of mod. the caliper or just milling the brake pads down....
post #10 of (permalink) Old 11-04-2002, 08:39 AM
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Re: GM 14 bolt rear disk brakes?

Here is a link to a parts list for the swap. He doesn't seem to say that you need a different rotor if you go with either caliper.

http://www.shakerbuilt.com/14_Bolt.html

Laters, Ryan
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