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Old 01-19-2006, 08:06 AM   #1
akula-ssh
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Default When would one need to rebuild a caliper?

After seeing these pictures, someone told me the pistons look like they are worn and need replacing. What's your opinion?

<img src="http://pictureposter.audiworld.com/70933/img_0235.jpg">
<img src="http://pictureposter.audiworld.com/70933/img_0237.jpg">

I thought they look just fine myself, but since this somebody supposedly really knows about brakes, I'm now worried...
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List of 3.0 owners on AW compiled by A4AdMan



<big>2002 Audi A4 Avant 3.0 Quattro Tiptronic</big>
Premium package, sport package, xenon headlights


Modifications to date:

Neuspeed Sport springs
Koni shocks (50% all around)
H-Sport anti-roll bars
custom stainless steel rear upper spring seat spacer
Silver OZ Superleggera 18x8
Sumitomo HTR Z III 235/40-18 95Y XL (current summer)
Toyo T1R 235/40-18 95Y (previous summer)
Falken GRB FK-451 235/40-18 91Y (previous summer)
Dunlop SP WinterSport M2 235/45-17 94H (winter)

Supersprint resonator and mufflers (quick video clip here)
BMC CDA intake

Alcon B Type calipers
Coleman Racing 13x1.25" 2-piece rotors
Carbotech XP8 brake pads

aluminum interior trim

black bumper grill
opened driver side foglight grill (from 1.8T)
auto-dimming blind-spot Euro side mirrors
bi-xenon E-code headlights
Ultraleds (ultraleds.co.uk) 1W LED H6W bulbs
Sylvania SilverStar H7 (high beams)
Stealth blinker bulbs 7507 (front and rear)
Hüper Optik Ceramic 60 and Sech (metal) tint

My alignment specs
Writeup on load equalizers mounted inside e-code housing
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Old 01-19-2006, 12:47 PM   #2
ryans4
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Default seals and bleed screws are pretty cheap, might as well replace while the calipers are not installed

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Old 01-19-2006, 01:42 PM   #3
akula-ssh
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Default I was told I need new PISTONS though, which is why I'm so worried. Do they look off to you?

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List of 3.0 owners on AW compiled by A4AdMan



<big>2002 Audi A4 Avant 3.0 Quattro Tiptronic</big>
Premium package, sport package, xenon headlights


Modifications to date:

Neuspeed Sport springs
Koni shocks (50% all around)
H-Sport anti-roll bars
custom stainless steel rear upper spring seat spacer
Silver OZ Superleggera 18x8
Sumitomo HTR Z III 235/40-18 95Y XL (current summer)
Toyo T1R 235/40-18 95Y (previous summer)
Falken GRB FK-451 235/40-18 91Y (previous summer)
Dunlop SP WinterSport M2 235/45-17 94H (winter)

Supersprint resonator and mufflers (quick video clip here)
BMC CDA intake

Alcon B Type calipers
Coleman Racing 13x1.25" 2-piece rotors
Carbotech XP8 brake pads

aluminum interior trim

black bumper grill
opened driver side foglight grill (from 1.8T)
auto-dimming blind-spot Euro side mirrors
bi-xenon E-code headlights
Ultraleds (ultraleds.co.uk) 1W LED H6W bulbs
Sylvania SilverStar H7 (high beams)
Stealth blinker bulbs 7507 (front and rear)
Hüper Optik Ceramic 60 and Sech (metal) tint

My alignment specs
Writeup on load equalizers mounted inside e-code housing
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Old 01-19-2006, 03:24 PM   #4
ryans4
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Default tough to tell if it's rust or dirt or whatever...

...but when they are out for the seal replacement, you can clean them up good and give them a thorough inspection. The critical part of the piston is not the part that touches the pad, it's the part inside the seal. if that has wear or the sides have wear, then I'd consider new pistons. If not, put them back in.
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Old 01-19-2006, 07:19 PM   #5
akula-ssh
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Default Thanks for the response!

__________________
List of 3.0 owners on AW compiled by A4AdMan



<big>2002 Audi A4 Avant 3.0 Quattro Tiptronic</big>
Premium package, sport package, xenon headlights


Modifications to date:

Neuspeed Sport springs
Koni shocks (50% all around)
H-Sport anti-roll bars
custom stainless steel rear upper spring seat spacer
Silver OZ Superleggera 18x8
Sumitomo HTR Z III 235/40-18 95Y XL (current summer)
Toyo T1R 235/40-18 95Y (previous summer)
Falken GRB FK-451 235/40-18 91Y (previous summer)
Dunlop SP WinterSport M2 235/45-17 94H (winter)

Supersprint resonator and mufflers (quick video clip here)
BMC CDA intake

Alcon B Type calipers
Coleman Racing 13x1.25" 2-piece rotors
Carbotech XP8 brake pads

aluminum interior trim

black bumper grill
opened driver side foglight grill (from 1.8T)
auto-dimming blind-spot Euro side mirrors
bi-xenon E-code headlights
Ultraleds (ultraleds.co.uk) 1W LED H6W bulbs
Sylvania SilverStar H7 (high beams)
Stealth blinker bulbs 7507 (front and rear)
Hüper Optik Ceramic 60 and Sech (metal) tint

My alignment specs
Writeup on load equalizers mounted inside e-code housing
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Old 01-20-2006, 08:30 AM   #6
CP
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Default Any tips for dual piston calipers?

I've got to replace my ripped seals this spring. Hopefully they don't rust up before then. I've heard that it's pretty hard to get both pistons back in, because as you push one in, the other wants to come out. Or is this not an issue when the brake line isn't hooked up?
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Old 01-20-2006, 11:21 AM   #7
ryans4
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Default Put a block of wood or something in there to keep the pistons from moving...

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Old 03-01-2006, 09:28 PM   #8
Just Paul
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Default it helps to have the bleeder open too.

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Old 03-01-2006, 09:28 PM
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