Brake pistons diameter?

[bigbear007]

Hi all,
Does anyone know the diameter of the standard front and rear brake pistons?
And if possible the Toyota OEM part numbers for both too.

[Carolyn]

That's one hell of a question.  I reckon someone will have to push out some pistons and measure them.

Out of interest; why do you ask?

[J03]

51mm front / 45mm rear.

[Joesson]

http://www.budweg.com/product/list?search=toyota%20mr2%20mk3#Column=Alphabetical&Order=Ascending&Page=1&Search=toyota%20mr2%20mk3&IsPaging=true&CarBrand=TOYOTA&CarModel=MR2&CarEngine=1.8&CarYear=&CarFuel=&CarVariant=

For a second opinion That seems to check out with Budweiser repair kit info.

[bigbear007]

That's one hell of a question.  I reckon someone will have to push out some pistons and measure them.

Out of interest; why do you ask?

Glad you like it Carolyn 
Its for my Claper refurb small (very small) bussiness i'm setting up for club folk both here and on FB by a club guy.
I have just about finished - equipped the shed / workshop to start.
I'll also be able to do small job powder coating too,  (600mm x 900mm max size of the oven) 

I think the measurements are as said 52mm fronts and 45mm rears, still don't know the oem numbers yet though 

[Carolyn]

Perhaps the supplier of the rubber bit kits will know?

[shnazzle]

@manos3003 knows. He told me but I forgot

[shnazzle]

Found his message

Front is 50mm,rear is 44.32mm

[Topdownman]

You may be able to find the part numbers on this site?

https://www.amayama.com/en/genuine-catalogs/toyota

[Joesson]

As my earlier post Budweg, manufacturers of brake calipers and components give fdimensions of Caliper pistons and indicate an EAN number with their parts.
Instantly-recognisable, EAN/UPC barcodes are printed on virtually every consumer product in the world. They are the longest-established and most widely-used of all GS1 barcodes. The EAN/UPC barcode family has transformed the world of retail.
Maybe that is what is wanted, otherwise I have found a visit to Mr T can provide a printed quotation for a component that contains their OE number which may or may not be an EAN number.

[Carolyn]

You may be able to find the part numbers on this site?

https://www.amayama.com/en/genuine-catalogs/toyota

Indeed they are in the under MR S.

Front: front brake cylinder 47731-52010

Rear: rear 47701-17040

Very handy tool!  Thanks Topdownman. 

[Joesson]

As my earlier post Budweg, manufacturers of brake calipers and components give fdimensions of Caliper pistons and indicate an EAN number with their parts.
Instantly-recognisable, EAN/UPC barcodes are printed on virtually every consumer product in the world. They are the longest-established and most widely-used of all GS1 barcodes. The EAN/UPC barcode family has transformed the world of retail.
Maybe that is what is wanted, otherwise I have found a visit to Mr T can provide a printed quotation for a component that contains their OE number which may or may not be an EAN number.

With reference to the Amayama catalogue as Topdownman/ Carolyn 's post
the EAN number is NOT the OE part number.