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Old 08-21-2012, 01:24 PM   #136
craydds OP
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Originally Posted by gasolinePony View Post
I'm looking at some of that surface rust in the piston bore (piston itself I've already ordered). Would you recommend wax metallic finish to remove it?
It is easy to clean the piston bore with a good scrubbing; scotchbrite, as you mentioned, with detergent should work well. A bit of phosphoric rust remover couldn't hurt, but don't leave it in contact with the surface for too long. Thorough rinsing and drying should do the trick. Any product/cleaner/etc. must be completely rinsed away so as not to interfere with the brake fluid. Good luck!
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Old 02-05-2013, 02:57 PM   #137
sigpe57
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Are there after-market dust boot and seal kit or just by from the BMW Dealer?

Where is the best place to buy?
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Old 02-05-2013, 04:25 PM   #138
craydds OP
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Originally Posted by sigpe57 View Post
Are there after-market dust boot and seal kit or just by from the BMW Dealer?

Where is the best place to buy?
No aftermarket seal/dust boot kit that I know of, but several of the parts suppliers carry these items. Where are you located - have a local shop in your area? You might give Ted Porter a call, http://beemershop.com/Merchant5/merc...BS&Screen=PLST . Do you have 40 mm or 38 mm ATE's?
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Old 02-05-2013, 05:38 PM   #139
sigpe57
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Originally Posted by craydds View Post
No aftermarket seal/dust boot kit that I know of, but several of the parts suppliers carry these items. Where are you located - have a local shop in your area? You might give Ted Porter a call, http://beemershop.com/Merchant5/merc...BS&Screen=PLST . Do you have 40 mm or 38 mm ATE's?
Good question, I don't know it's 38 or 40mm. How do I check?

I'm in Los Angeles. Few BMW dealers here.
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Old 02-05-2013, 06:28 PM   #140
Kai Ju
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Originally Posted by sigpe57 View Post
Good question, I don't know it's 38 or 40mm. How do I check?

I'm in Los Angeles. Few BMW dealers here.
The number is stamped on the outside of the caliper.

Re dealers in LA, there is Long Beach BMW, Irv Seavers ( my choice since they usually have what I need in stock ), BMW of Hollywood, BMW of Ventura County, BMW of Riverside, or let google be your friend: http://tinyurl.com/ao53k85
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Old 02-05-2013, 06:30 PM   #141
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I ordered a kit from motobins:http://www.motobins.co.uk/displayfin...search=1&go=GO

and an extra piston seal: http://www.motobins.co.uk/displayfin...search=1&go=GO

The extra piston seal is for my current ATE caliper with the kit for converting to dual ATE's. Provided you have a couple (+) weeks to wait for the parts, motobins has parts difficult to find elsewhere. I can recommend doing business with them. They don't use the BMW part number system, so some of the parts needed to be hunted down, but they seem to have most all the parts for all the models.
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Old 02-06-2013, 01:11 AM   #142
chasbmw
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Originally Posted by Kai Ju View Post
The number is stamped on the outside of the caliper.

Re dealers in LA, there is Long Beach BMW, Irv Seavers ( my choice since they usually have what I need in stock ), BMW of Hollywood, BMW of Ventura County, BMW of Riverside, or let google be your friend: http://tinyurl.com/ao53k85
I have a feeling that the 38s are stamped with 38, but the 40s are not stamped.

If you put your engine no into realoem you will get build date for your bike. I think that 40 s were introduced from 09/75, but I'm not 100% sure. My bike is dated 06/75 and has a bit of a mixture of 75 and 76 model year parts. BMW model year starts from September, when the factory after the summer holidays starts building the bikes for the next calender years selling season, so a 10/75 build date means that you have a 76 model year bike. During the changeover period, bikes could be built with a mixture of parts as the 'old' parts are used up.
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Old 02-06-2013, 01:33 AM   #143
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The 40's are stamped with a number 40 most of the time. The 38's do not have a number stamped. I have heard there are some 40's not stamped, maybe late production but I've never seen one.

If it is stamped the number is on the large round area visible when the caliper is mounted on the bike.
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Old 02-06-2013, 05:46 AM   #144
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Originally Posted by sigpe57 View Post
Good question, I don't know it's 38 or 40mm. How do I check?
This is a 40 mm caliper off my '76 R90S. It is clearly stamped with 40:


This is the caliper on my '75 R90S. It is in fact a 38 mm. No stamp:


If you are going to remove the pistons anyway, just pop 'em out and measure with a caliper. Then order your parts needed. Best of luck! Let us know how it's going.
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