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Member 911 Anonymous
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3.2 Rear Brake Caliper PISTONS, Source?
Okay Fellas,
I can't be the only guy looking to replace the rear brake caliper PISTONS? Is this item NLA? Can't find it anywhere. I just recently cleaned and refreshed seals on all four calipers and replaced the front pistons due to severe pitting on 3 out of 4 them. Yes, I had mushy brakes and could never get them OEM hard even after a dozen bleeding sessions. After the front piston replacement and one bleed session, Pedal is Hard as a rock and stops on a dime.  I am just not happy with 1 of 4 rear pistons, no pitting but a groove that is too close to the inner seal is making me insecure. BTW, Syl-Glide is your best friend  TIA, Jim Side Note: rear dust covers trick, remove the barbed ring and squash every other barb and it will pop on nicely and still have proper tension to stay on the caliper.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-03-2015, 11:54 AM
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Member 911 Anonymous
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Okay, dug a little deeper and found on CENTRIC site:
Centric 146.42007 (42MM OD) $25.00 each, ain't bad. Apparently it also fits MBZ 300E  ELECTRONIC CATALOG - LOOKUP BY APPLICATION Huh? they also have the outer ring type dust covers ( OEM ) for these???  #143.35003 $8.00 Not bad at all.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC Last edited by DRACO A5OG; 05-03-2015 at 12:21 PM.. |
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05-03-2015, 12:14 PM
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Project Addicted
Join Date: Jul 2012
Location: Eastern Shore. MD
Posts: 919
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Eric at PMB will have them.
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Jon 1966 912 1976 911 3.4 Backdate Project 1986 944 |
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05-03-2015, 01:20 PM
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Member 911 Anonymous
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Hmm, I checked their website already, it is not listed. Better call him to see if he gots them or not.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-03-2015, 02:14 PM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,020
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I wouldn't flinch at running Centric dust shields but their caliper seals are dangerous. WAY too much seal retraction and they won't "break in" to work correctly.
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. Last edited by Quicksilver; 05-03-2015 at 03:06 PM.. |
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05-03-2015, 02:58 PM
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Member 911 Anonymous
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Good to know.
I have the FTE seal kit in her already. Just wanting to replace the pistons. $8.00 for a proper dust boot design, I can live that.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-03-2015, 03:24 PM
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Registered
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Try Stromski........
I saw at Hershey at their booth stainless brake caliper pistons to replace rusted/pitted OEM pistons. They are available in their catalog too.
Tony |
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05-03-2015, 03:37 PM
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Member 911 Anonymous
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Huh? Rears? I do know they have fronts but I think that is all they have. Website does not have rears listed.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-03-2015, 03:40 PM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,020
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Going to stainless pistons will insure that the pistons don't corrode...
And seeing that the calipers are now more anodic they will corrode instead and at a higher rate! Stainless is .35V up the scale from iron and .45V from aluminum. That is too much of a difference. Porsche (and pretty much any other car company) didn't pick steel pistons by accident. To stop possible corrosion simply bleed the system on a scheduled basis to keep moisture out of it.
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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05-04-2015, 05:16 AM
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Occasional User
Join Date: Sep 2013
Location: Alberta
Posts: 1,023
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I need to fix up the calipers on my 89 track to street project, as seals are toast and caliper pistons have some corrosion. I looked at some pistons on ebay.uk as they seemed to have a better selection. The US exchange rate would make these reasonable.
I also thought about going the PMB route to make sure I got it done right. But in the end, I ordered a set of Porsche classic fronts and backs. I felt the price was very good. (Suncoast) I am less mechanically inclined, so this seemed like a sure thing. I may restore the originals later, or sell them as cores. I would be interested to hear where you end up sourcing the parts
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Vince 2015 Boxster S, Black & Black 1989 Carrera Silver Coupe, Silk Grey - sold 2009 Cayman S White, Full Cocoa - sold 1972 911E Silver Coupe, Pepita & Black - sold |
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05-04-2015, 07:27 AM
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Member 911 Anonymous
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I plan to order the pistons and seal kit by Centric but only use the dust boot not the inner seal. The FTE's are 3 days old and should be fine.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-04-2015, 05:19 PM
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Member 911 Anonymous
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Rear 42MM Pistons FOUND!
Update:
So, it has been awhile since I updated this post. I thought I purchased some rear calipers only to discover they were fronts. Doh! NO biggy, they will be used sooner of later since I have replaced the fronts already. So now to concentrate on the rear 42MM pistons. What I discovered, they are basically NLA. There is a piston with same dimension that 80-89 MBZ 300 series uses but the lip is thinner like our fronts. I really do not think it is a match. Plus the replacement is Steel/Aluminum. We need Stainless Steel/Steel. So I found two very good sources out of the UK: A member here Chris Seven sells a superior Titanium coated piston. Not to sure of the cost as the 38MM was $40 each and shipping to 90275 was $50 ( this was for front and rears ). Not bad for a NLA part and Titanium to boot. Please PM him to confirm.  6AL4V (Grade 5) Titanium with a Black titanium Carbide Coating The other is Bigg Red, ltd. Stainless Steel (item #BRP234201) 16.95 British Pounds plus 12.90 Shipping, so current exchange rate would be $104.97 Shipped to 90275. You need to email them to receive a PayPal invoice. I chose snail mail or the lowest shipping cost possible Bigg Red. Replacement Rear Brake Caliper Piston for BMW,Mercedes,Porsche  Credit for the lead above goes to member Astroman, Thank you brother!
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC Last edited by DRACO A5OG; 08-10-2016 at 10:42 AM.. |
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08-10-2016, 10:40 AM
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Marble Grey
