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Omega General Help / Re: rear calliper/ pad fitting kit Question.
« on: 03 May 2022, 02:54:46 »
Surely the vented caliper pistons are slightly larger than the pistons for non vented solid discs?
The rear calipers for 12mm thick solid discs have '40' cast into the piston housings.
Calipers for 20mm thick vented rear discs have '42' cast into the piston housings. So roughly 9% more surface area on the pistons.
These vented calipers also have the 8mm thick spacer between the two halves to allow for the extra 8mm thickness of the vented disc.
countrywoman says her calipers have 40 cast into the housings. 40 would indicate solid discs and standard fitting kit. Check and see if there is an an 8mm spacer sandwiched between the castings? No spacer would confirm solid discs.
What's the part number of the fitting kit you have? Assuming you have solid disc calipers it sounds to me that you have a Vectra B fitting kit which won't work.
The rear calipers for 12mm thick solid discs have '40' cast into the piston housings.
Calipers for 20mm thick vented rear discs have '42' cast into the piston housings. So roughly 9% more surface area on the pistons.
These vented calipers also have the 8mm thick spacer between the two halves to allow for the extra 8mm thickness of the vented disc.
countrywoman says her calipers have 40 cast into the housings. 40 would indicate solid discs and standard fitting kit. Check and see if there is an an 8mm spacer sandwiched between the castings? No spacer would confirm solid discs.
What's the part number of the fitting kit you have? Assuming you have solid disc calipers it sounds to me that you have a Vectra B fitting kit which won't work.