slowpoke

can you powder coat a brake calliper with all the internals in it still ie pistong and rubber seals etc IF the seals and delicate bits are masked off ?

why im asking is would the leccy charge damage the seals or anything ?

im thinking it shouldnt do as rubber doesnt conduct leccy

anyone have any more insight into this please ?

matt

jacko

cant be done mate the lecy wauldnt harm it but when thay bake them it waild wreck the seals but you can get them chromed

Anonymous

I do powder coating i do know of people who have left them all intact but personly i would not it might just melt.

Al Bags

Hi mate ...
Just overhauled some Cossie 4WD calipers with a brand-new seal set, bellows, etc. I had those powder-coated. I left the old bore-seal in place, slid the piston fully back, and sealed around the joint with High-temp Silicone. Then fitted a couple of old hose stubs (sealed off, but put some fine drill-holes through them)
The heat of firing expands the air in the cylinder .. Normally this would push the pistons out, but in my case, pressure exhausted out of the tiny holes in the hoses.
I found that the old seals survived fine. Powder coating needs firing at a pretty high temp (cheap sealants will melt and run out) Overspray powder comes off easy with a bit of stripper.
In your case, I would take the seals out carefully, and do as I did, then afterwards, refit the seals (if you HAVE to use the originals) with some red brake grease (for hydraulic systems) and brake fluid, after checking bore and pistons are polished up and any deposits removed.

Hope that helps!

slowpoke

hmmm looks like there being sprayed then

really dont fancy taking the callipers apart i can only just change the pads pmsl

cheers guys ..................matt

Anonymous

U could cure them under a lamp wich might not make the internals of the caliper get that hot ??

Al Bags

Easy job to strip them mate .. It's a big seal. You can pressurise the pistons out with a tyre pump plus adapter. Make sure you have a rag over the area, cos it comes out pretty fierce. Only thing to be careful of is not to damage the piston surface. Having said that, you can polish out small marks OK. It's a big seal, and the piston/bore clearance is not that tight.

Even a Restaurant Servery lamp or a Vivarium Ceramic lamp would not get them hot enough .. Besides, the powder needs the charge to keep it on the base material, til it's stoved on. How you gonna do that in the kitchen?

Anonymous

U can use gas lamps mate like doing bike frames and stuff dont see why it would not work.

Al Bags

OK, yes, but he's still no better off .. Still need that 200C .. (forget the actual temp)

Si B

iTrader: (59)

Al Bags

Good techy answer to a question, unlike my

I think....,
IIRC....
As far as I can remember...

type answers

I was wondering the same thing Matt, you saved me asking it!

Cheers
Simon

ste_gt

Powder coating is generally 'low bake' these days, the powder is stoved at 200 degree's celsius for 15 minutes.

*****I'd strongly advise NOT leaving any rubber in place especially pistons seals for your own safety*****


If you didn't want to remove the seals you could indeed cure the coating with IR although I wouldn't waste my time personally, just strip the caliper and renew the seals.


Any questions, just ask

Al Bags

My local guy is thankfully a car lover .. Has a nice old 911.
His custom-built oven is 15 metres long Massive ... He can handle long railings, staircases .. that sort of thing .. I asked him if he could get my whole van in it!
Great place .. He has a colour chart of about 30-40 choices .. one of them Ford "Essex" blue, thankfully