306 205 interchangeability and Imlachs stock.
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  1. #1
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    Default 306 205 interchangeability and Imlachs stock.

    I need a rear disc and caliper for the S3 205 GTi I picked up the other day.
    There is an 8 valve 306 XSi at Imlachs, question is will the rear brakes from this fit the 205, likely yes, but do they have the same size pistons?
    Also, will the light switch from this fit a GTi6?
    By the way there are at least two XU10J4R at Imlachs (Centre Road Wreckers, Springvale) mainly in late model Xantias.
    There is at least one DKZ, in a 405 and a few 8 valve XU10s, including the one in the XSi, by the way the XSi seats are very good, wrap around style.
    Also a heap of 8 valve 1.8 306 motors with the cam covers taken off, why?
    Graham

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    Quote Originally Posted by GRAHAM WALLIS View Post
    I need a rear disc and caliper for the S3 205 GTi I picked up the other day.
    There is an 8 valve 306 XSi at Imlachs, question is will the rear brakes from this fit the 205, likely yes, but do they have the same size pistons?

    Also, will the light switch from this fit a GTi6?
    Graham
    Yes

    No - gti6 requires a twin optic switch; 8v is single I'm pretty sure

  3. #3
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    Quote Originally Posted by GRAHAM WALLIS View Post
    I need a rear disc and caliper for the S3 205 GTi I picked up the other day.
    There is an 8 valve 306 XSi at Imlachs, question is will the rear brakes from this fit the 205, likely yes, but do they have the same size pistons?
    Also, will the light switch from this fit a GTi6?
    By the way there are at least two XU10J4R at Imlachs (Centre Road Wreckers, Springvale) mainly in late model Xantias.
    There is at least one DKZ, in a 405 and a few 8 valve XU10s, including the one in the XSi, by the way the XSi seats are very good, wrap around style.
    Also a heap of 8 valve 1.8 306 motors with the cam covers taken off, why?
    Graham
    Only one XU10J4R there now, in a 406.
    However, there is a 1.8 306 16 valve, may be a good 205 conversion as they have an alloy block with the late head so a lot of potential.
    I'd check the timing belt though, the car looks perfect, why is it there you've got to ask. These engines are $260 complete.
    Graham

  4. #4
    I might be slow... DRTDVL's Avatar
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    the rear brakes are either identical or marginally bigger on the 306, it wouldn't be worth worrying about... i've got a set of both under the house i could measure but if they are different the piston would be a mm or so larger in dia.

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    Quote Originally Posted by DRTDVL View Post
    the rear brakes are either identical or marginally bigger on the 306, it wouldn't be worth worrying about... i've got a set of both under the house i could measure but if they are different the piston would be a mm or so larger in dia.
    Have to be identical as I'm replacing a brake that has smashed disc and caliper!
    I'll find out if they fit in the next day or so.
    Graham

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    They fit but cannot be sure about the piston size.
    Buy both rear calipers and fit them to the car.
    Adrian Wuillemin

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    Quote Originally Posted by Adrian Wuillemi View Post
    They fit but cannot be sure about the piston size.
    Buy both rear calipers and fit them to the car.
    Actually just remembered that I asked Ken at Caravelle and he said the repair kits are the same so should be OK.
    I'm just hoping the mounting bracket isn't bent!
    Incidentally I just fitted GTi drums to the back of the Si after overheating the originals badly in the rally a few weeks back. Seems to stop fine without any limiting valve (these are in the cylinders for the Si) so keep the fingers crossed that I won't have to source some more early GTi bits.
    Graham

  8. #8
    I might be slow... DRTDVL's Avatar
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    i took both mine off the 306 and put them on the 205 so i know they fit.

    But i'll have a look tomorrow at the pistons.

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    let me know if it is bent. I think i have one somewhere.
    Adrian Wuillemin

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    Quote Originally Posted by Adrian Wuillemi View Post
    let me know if it is bent. I think i have one somewhere.
    Thanks, will do.
    Graham

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    I might be slow... DRTDVL's Avatar
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    Quote Originally Posted by GRAHAM WALLIS View Post
    Have to be identical as I'm replacing a brake that has smashed disc and caliper!
    Graham
    Just read on 205 drivers that it's 205 = 30mm and 306 = 32mm piston size.

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    Well, I'm about to try and fit a set of GTI6 front brakes onto my 405. Could be interesting. Haven't yet looked at the comparative piston areas, so not yet certain if the original master cylinder will math well with the revised layout. Not intending to change the rears thoug, so the other risk is generating an imbalance front to rear........

    Anyone done this conversion before?
    racing 405
    1:59:09 last time at Phillip Island - less than standard Mi16.

  13. #13
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    I don't think they'll fit without a very big hammer. I think you'll find you need 406 brakes. Best bet is to find a pair of 406 Coupe Brembo calipers, and even then you'll probably need wheel spacers depending on what wheel you use. Remove the compensator, fit a quality bias valve and re-plumb the rear.

    and 305x28mm coupe rotors
    Last edited by PeterT; 19th July 2011 at 11:07 PM.

    '92 205 Mi16
    '90 Mi16x4

  14. #14
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    Quote Originally Posted by DRTDVL View Post
    Just read on 205 drivers that it's 205 = 30mm and 306 = 32mm piston size.
    Thanks for that.
    They certainly fit alright and the caliper lines up straight so the bracket seems OK.
    Haven't been able to complete the job as one of the bolts is sheared and I'll have to get the broken piece out.
    Graham

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