2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

'89 GTU with 5 lug hubs but non-vented rear rotors, is this normal?

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Old Jun 24, 2021 | 05:15 PM
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'89 GTU with 5 lug hubs but non-vented rear rotors, is this normal?

I'm trying to do a big brake conversion BUT the rear rotors aren't vented they're solid, I was told all 5 lug hubs have the vented BUT mine are solid?? Help!

Originals on left and big brake conversion are from a '93 FD but won't fit over hub and are too wide (almost twice as thick as original solids).

The instructions from bracket company says \"careful grinding" of hubs and calipers BUT can't believe it's that much. Am I over thinking this upgrade??
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Old Jun 25, 2021 | 06:26 AM
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1989 GTU
9.8" ventilated front discs, 10.3" solid rear discs
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Old Jun 25, 2021 | 08:38 AM
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if you can find a set of calipers for an FC with vented rear rotors, then you would be in business
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Old Jun 25, 2021 | 01:07 PM
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Originally Posted by Turbonut
1989 GTU
9.8" ventilated front discs, 10.3" solid rear discs
GX as well
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Old Jun 25, 2021 | 02:28 PM
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All S5 GTU's had solid rear discs. The GTU was the base model for '89-'91 production.
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Old Jun 26, 2021 | 08:12 AM
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Same

What did you figure out? I'm trying to do the same thing.
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