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Anish Varsani
DieHard
QLD
V8 UZZ30

Posts: 524
Reg: 07-2005

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Wednesday, July 18, 2007 - 11:38 am, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I was talking to a few brake places about overhauling calipers. They said that they strip down the calipers and acid dip them to clean them, then they paint.

Anyone know what type of acid they use? Will it pit the caliper bore and piston?
Jeff Bedsor
TryHard
QLD
TT

Posts: 102
Reg: 10-2006

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Wednesday, July 18, 2007 - 11:50 am, by:  Jeff Bedsor (Jeff_bedsor) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

The guy I took mine to used a mini sandblaster to strip all the crud off, I'd be a bit wary of acid though.
Simon Triantafillou
Goo Roo
NSW
Soarer Turbo

Posts: 1130
Reg: 07-2005

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Wednesday, July 18, 2007 - 12:05 pm, by:  Simon Triantafillou (Soarer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Don't take it to the place that did this...

http://www.toymods.net/forums/showpost.php?p=337548&postcount=14
Anish Varsani
DieHard
QLD
V8 UZZ30

Posts: 525
Reg: 07-2005

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Wednesday, July 18, 2007 - 12:13 pm, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I can't open the link as I'm not a member.

I'll probably clean the calipers myself with a wire brush and use rust converter if there is any rust before painting.
Darryn Dewar
DieHard
Gisborne
UZZ30 Soarer

Posts: 793
Reg: 09-2005

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Wednesday, July 18, 2007 - 01:04 pm, by:  Darryn Dewar (Mrphreak) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Upload

Upload

Upload

Upload
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 2771
Reg: 10-2005

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Wednesday, July 18, 2007 - 01:09 pm, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Oh nice, quality work that!
Brian Timms
DieHard
New South Wales
TT Soarer Goodness.

Posts: 507
Reg: 12-2006

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Wednesday, July 18, 2007 - 01:24 pm, by:  Brian Timms (Turbo_brian) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Acid dip is usually a 0.1 molar Hydro-chloric acid wash, shouldn't hurt the callipers, as long as they are washed off properly, and not left in the bath for an extended period of time.

It's done with complete car bodies as well, and they leave them in overnight to eat out rust and other nasty imperfections, leaving perfect metal.

For painting callipers, I either use a sandblaster, or just sit there for a while with sandpaper, 120 grit wet and dry, to clean the callipers up, then 400grit to prep the surface for painting. (always off the car of course).

B.
Marc Vipond
TryHard
Queensland
JZZ30 GT35R

Posts: 384
Reg: 05-2006

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Wednesday, July 18, 2007 - 05:30 pm, by:  Marc Vipond (04awe) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Nice!
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1067
Reg: 07-2005

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Monday, July 30, 2007 - 08:58 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

To do it properly it should be a inhibited hydrochloric acid which means it only gets rid of the rust and will not eat the steel.

Its either Inhibited or Unhibited i forget.
Anish Varsani
DieHard
QLD
V8 UZZ30

Posts: 534
Reg: 07-2005

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Tuesday, July 31, 2007 - 05:09 am, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Phosphoric acid works.

Most rust converters you get at the hardware store are just phosphoric acid.

Some aluminium are phosphoric acid as well but others also have Amonia bifluride and hydrofluoric acid which will eat almost anything, glass included. It leave a yellow stain, much like the calipers above.
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1069
Reg: 07-2005

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Wednesday, August 01, 2007 - 06:12 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

hahah Anish. Hydrofluoric Acid has to be one of the nastiest Acids to deal with. (Safety Wise very nasty if you get it on you)

I wouldnt recommend anyone to use this, i absolutly hate having to work with this at work which isnt very often at all.

Plus im pretty sure Hydrofluoric Acid doesnt eat through rust as well as Hydrochloric Acid or Phosphoric Acid. Hydrofluoric Acid is great along with Ammonium Bifluoride to eat through Glass as you mentioned (generally used in Glass Etching not for eating rust)


If anyones keen on Acid Dipping the brake callipers i would be using a Inhibited HCL dip that way you are 100% guranted not to have any of the brake calliper eaten away.
Anish Varsani
DieHard
QLD
V8 UZZ30

Posts: 537
Reg: 07-2005

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Wednesday, August 01, 2007 - 07:16 pm, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Septone Alibrite was quoted as having hydrofluoric acid and amonia bifluoride.

Wasn't game enough to try it.
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1070
Reg: 07-2005

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Wednesday, August 01, 2007 - 08:13 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Never heard of it, But please dont try it.

Hydrofluoric Acid does not burn your skin. But actually seeps into your skin and eats your bone away. Im told its VERY VERY Painful. Its defiantly a chemical you have to have 110% respect for.

So you can see why i dont like it. If it only was corrosive to your skin like Hydrochloric Acid i would say give it a try. But to clean brake callipers isnt worth the risk.
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1071
Reg: 07-2005

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Wednesday, August 01, 2007 - 08:20 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I just looked up Septone Alibrite and you can see that it tells you in the MSDS that you have to immediatley apply Calcium Gluconate Gel That helps neaturlize the Hydrofluoric Acid from attacking your bones, But you have to be very quick to apply it.

On another note, what exactley are the callipers made out off?
Tom Kneebone
TryHard
WA
93 factory 5 spd TT : 91 Auto TT

Posts: 412
Reg: 10-2005

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Thursday, August 02, 2007 - 06:03 pm, by:  Tom Kneebone (Tomk) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I just used a dremel and wire brush then painted with high temperature paint.
Maurice Diggler
Goo Roo
Victoria
Twin Turbo

Posts: 1418
Reg: 06-2006

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Friday, August 17, 2007 - 08:08 am, by:  Maurice Diggler (Mau_rice) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Shane McInnes wrote on Monday, July 30, 2007 - 08:58 pm:

To do it properly it should be a inhibited hydrochloric acid which means it only gets rid of the rust and will not eat the steel.


Haha, you chemical nerd!
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1080
Reg: 07-2005

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Saturday, August 18, 2007 - 07:04 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

lol ill remember that. When you need something.
Maurice Diggler
Goo Roo
Victoria
Twin Turbo

Posts: 1422
Reg: 06-2006

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Sunday, August 19, 2007 - 10:55 am, by:  Maurice Diggler (Mau_rice) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

You love me, I'll be JUST fine. :-)

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