306 Gti6 Rear Calipers On 309 Gti?

[bobdylan_55 1]

are gti6 rear calipers ok to use on a 309? the yoke has same part number, but different cylinder part numbers?

cheers

[Anthony 1,002]

They'll fit, but the piston is larger (32 vs 30mm) and thus I'd suggest only fitting them as a matched pair to avoid possible brake effort mis-match issues

[welshpug 1,646]

As above, you'll get a slightly higher rear braking force with them especially if you retain the usual 20.6mm master cylinder.

[Daviewonder 533 3 Cars]

Anyone know if 106 ones will fit and what size the pistons are please?

[bobdylan_55 1]

forgot to mention i have a pedal box, with bias adjuster, and no servo, so would it matter much about the piston size? cheers

[welshpug 1,646]

Davie, yes - 30mm.

 

Bobdylan, not really, just setup to suit

[bobdylan_55 1]

so will 106 gti rear calipers be better?

[Anthony 1,002]

106 GTi calipers are a straight, like for like swap if that's what you're after.

[JonnyGee 0]

i have calipers off a 106 rallye im assuming they are the same??

[Daviewonder 533 3 Cars]

Cheers Welshpug.

 

Did earlier GTI6's have 30mm pistons? If so does anyone know when the change over was?

[welshpug 1,646]

no, they all had 32mm, lower spec 306's have 30mm afaik.