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Frp Calipers Still Going Strong

#1 User is offline   eldoodarino 

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Posted 12 March 2007 - 08:57 PM

I thought i'd better do a full caliper inspection this year as it's been nearly two years now... huh.gif

I was most pleased to find that the usual corrosion problems behind the pail retaining rails was almost non existent... and even better, when i cleaned a couple of the pistons up, they were still as new too... biggrin.gif biggrin.gif there was a tiny amount of pitting on the 38mm piston but cetainly not enough to warrant replacing it, as it will be shoved all the way back in when i fit my new pads...

these were the 4 pistons taken out of one caliper.... http://www.pumapeople.com/forum/index.php?automo...i&img=11119

I think the key to success with the Alcons is... strip them down and service them thoroughly... then leave them alone and let them bed.... just blasting them with brake cleaner alone is a waste of time in my opinion...

Enjoy the piccies... biggrin.gif biggrin.gif go to the gallery technical to view the full resolution...





Just though i'd update this post as iv'e finsihed now.... it took a little while longer than planned as i had to split one of the calipers to get at one of the knackered torx screws.... what a pig to remove... comp.gif comp.gif

pictures are in the Technical Gallery....

http://www.pumapeople.com/forum/index.php?automo...i&img=11397

http://www.pumapeople.com/forum/index.php?automo...i&img=11396

http://www.pumapeople.com/forum/index.php?automo...i&img=11398

click on the picture to see the full resolution... wink.gif

Chris
FRP453

This post has been edited by eldoodarino: 01 July 2007 - 11:12 AM

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#2 User is offline   eldoodarino 

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Posted 12 March 2007 - 09:06 PM

I guess i should add these were brand new calipers, when i fitted them... and that i removed 3 out of 4 pad rails and applied some copper grease before fitting to the car....

the 4th one i couldn't remove due to rounding off the torx screw wacko.gif (not by me)... i'm gona try to get this out soon.... will be interesting to note how much corrosion is behind this one..... wacko.gif

smile.gif

This post has been edited by eldoodarino: 12 March 2007 - 09:06 PM

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#3 User is offline   happy-kat 

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Posted 12 March 2007 - 09:07 PM

thanks for the post and pics smile.gif
searching is fruitful | I'm a sponge not a mechanic | please do try that if stuck with a Puma problem whilst waiting for a reply | For the Puma fan this read 'The Inside Story Book' is very nice to own sometimes still seen for sale

#4 User is offline   sikora 

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Posted 12 March 2007 - 10:01 PM

Chris, have you ever thought about writing a full guide on a caliper service?

#5 User is offline   PG12 

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Posted 12 March 2007 - 10:36 PM

QUOTE (sikora @ Mar 12 2007, 10:01 PM) <{POST_SNAPBACK}>
Chris, have you ever thought about writing a full guide on a caliper service?


...or offering a service?
RPJ DAMPENERS - POWERFLEX ALLROUND - JANSPEED SS SYSTEM - SOLD - probably in bits now...

#6 User is offline   eldoodarino 

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Posted 13 March 2007 - 07:41 AM

QUOTE (PG12 @ Mar 12 2007, 10:36 PM) <{POST_SNAPBACK}>
...or offering a service?


yes ... i do that already... on a small scale when i have free time....

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#7 User is offline   FRPtom 

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Posted 16 March 2007 - 01:36 PM

why go to all the effort of servicing them ! ditch them for some brembo's end you never have to worry again!

#8 User is offline   big g 

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Posted 16 March 2007 - 01:51 PM

just stripped mine not really that hard to do
cant be bothered with the extra cost of buying brembos and brakes etc

#9 User is offline   deluded 

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Posted 16 March 2007 - 02:17 PM

I've never pulled the calipers off - do you need to drain the brake fluid first?? And how do you get rid of air locks etc when putting them back on??

Looks like a much better aproach than covering them in cleaner, but I've never changed the brake fluid so am kind of nervous about that.
ex Silver 1.7 / ex FRP #416 / Astra SRi CDTI 150

#10 User is offline   eldoodarino 

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Posted 16 March 2007 - 05:13 PM

QUOTE (FRPtom @ Mar 16 2007, 01:36 PM) <{POST_SNAPBACK}>
why go to all the effort of servicing them ! ditch them for some brembo's end you never have to worry again!



why go to the effort of buying the car and then ruining it... stickpoke.gif

the alcons are custom made with the correct offset etc.... they work quite well too... wink.gif

QUOTE (deluded @ Mar 16 2007, 02:17 PM) <{POST_SNAPBACK}>
I've never pulled the calipers off - do you need to drain the brake fluid first?? And how do you get rid of air locks etc when putting them back on??

Looks like a much better aproach than covering them in cleaner, but I've never changed the brake fluid so am kind of nervous about that.



yeah, you do need a brake bleed kit... i use the Clarke one which attaches to the compressor...

i have done a seperate list of parts needed... i think Happy Kat made it 'sticky' too.... so to speak... smile.gif

This post has been edited by eldoodarino: 16 March 2007 - 05:11 PM

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#11 User is offline   happy-kat 

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Posted 16 March 2007 - 07:40 PM

yes it is in the Brake, Wheels and Suspension section smile.gif
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#12 User is offline   PG12 

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Posted 16 March 2007 - 08:09 PM

I've just had my calipers done at GK - I complained about some rubbing noise

They apparently (according to the receipt)...

"removed front pads and calipers remove slides clean off corrosion and rebuilt using silicone grease"

They seem ok though...

This post has been edited by PG12: 16 March 2007 - 08:09 PM

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#13 User is offline   happy-kat 

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Posted 16 March 2007 - 08:11 PM

I know now it's corrosion bleh.gif no need to bold it wink.gif
searching is fruitful | I'm a sponge not a mechanic | please do try that if stuck with a Puma problem whilst waiting for a reply | For the Puma fan this read 'The Inside Story Book' is very nice to own sometimes still seen for sale

#14 User is offline   PG12 

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Posted 16 March 2007 - 08:12 PM

QUOTE (happy-kat @ Mar 16 2007, 08:11 PM) <{POST_SNAPBACK}>
I know now it's corrosion bleh.gif no need to bold it wink.gif


Hmm, if it is corrosion - wonder why my sliders haven't bent?

Perhaps there are degrees of corrosion?

This post has been edited by PG12: 16 March 2007 - 08:15 PM

RPJ DAMPENERS - POWERFLEX ALLROUND - JANSPEED SS SYSTEM - SOLD - probably in bits now...

#15 User is offline   happy-kat 

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Posted 16 March 2007 - 08:27 PM

I had thought it was harmless oxidation not actual eating corrosion.

Chris from you other post when would I use the sand paper please?
Garnet Paper 100 grit (as recommended by stoptec) for pad re-finishing/surfacing.... (Don't use aluminium oxide paper)
http://www.axminster.co.uk/product.asp?pf_...le=1&jump=0

I am having my calipers cleaned by my local mechanic but will do it with him so to speak to see what's up. also getting the piston retraction tool from your parts list smile.gif
searching is fruitful | I'm a sponge not a mechanic | please do try that if stuck with a Puma problem whilst waiting for a reply | For the Puma fan this read 'The Inside Story Book' is very nice to own sometimes still seen for sale

#16 User is offline   eldoodarino 

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Posted 16 March 2007 - 08:41 PM

Lie the paper flat down and scrub the pads over it vigourously... this should bring the pad surface up to a nice new looking even texture....

and the brakes should feel good after re-bedding..... you can use sandpaper but this stuff is apperntly better for the discs, i seems to have worked well for me in the past...

smile.gif

QUOTE (PG12 @ Mar 16 2007, 08:12 PM) <{POST_SNAPBACK}>
Hmm, if it is corrosion - wonder why my sliders haven't bent?

Perhaps there are degrees of corrosion?



they probably will have bent a little at the bottom where there is nothing to hold them flat... mine have a bit, a little bit shouldn't matter

wink.gif
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#17 User is offline   happy-kat 

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Posted 16 March 2007 - 08:47 PM

thank you Chris smile.gif looks about a job I could manage wink.gif
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#18 User is offline   sikora 

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Posted 17 March 2007 - 12:10 AM

How easy are the seals to replace? Do you just give them a thin coating all round with the silicon grease?

#19 User is offline   eldoodarino 

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Posted 17 March 2007 - 08:41 AM

just hook them out with tweaser or tiny screwdriver.... clean up and thin coat of silicone grease all round as you say...

smile.gif
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#20 User is offline   eldoodarino 

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Posted 24 March 2007 - 07:02 PM

Just though i'd update this post as iv'e finsihed now.... it took a little while longer than planned as i had to split one of the calipers to get at one of the knackered torx screws.... what a pig to remove... comp.gif comp.gif

pictures are in the Technical Gallery....

http://www.pumapeople.com/forum/index.php?automo...i&img=11397

http://www.pumapeople.com/forum/index.php?automo...i&img=11396

http://www.pumapeople.com/forum/index.php?automo...i&img=11398

click on the picture to see the full resolution... wink.gif

Chris
FRP453

This post has been edited by eldoodarino: 03 May 2007 - 09:34 PM

Wizards Of Nos 60hp progressive delivery.... yeah baby yeah :-o
Denso Iridium Plugs
Helix Clutch
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