Pumapeople: I Am A Brake God! - Pumapeople

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I Am A Brake God! just fixed a lhd caliper!!!!! proper chuffed!&

#1 Guest_jacko_*


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Posted 13 December 2007 - 07:41 PM

bought some good condition alcons off ebay, just been serviced by pb too, stripped the rhd one for a full on proper service (found some small corrosion, proper paint up & refit) no probs, tried the lhd one - stuck!!!!!

the lower bolt had seized - properly seized!!!! the head was soft from trying etc

(is this why theres no spare lhd alcons available - does it kill them?)

INFO REMOVED!

IF ANYONE IS CONTEMPLATING THROWING AWAY AN ALCON CALIPER I WILL HAVE IT!!!!!!

i aint paying a lot for it tho cos this little lot took the best part of 2 months to sort out!!!! but i might just be able to save some otherwise 'scrap' calipers

im certainly not offering a 'fix' service...!!!!

This post has been edited by jacko: 07 May 2008 - 06:46 PM


#2 User is offline   BenF 

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Posted 13 December 2007 - 08:34 PM

is this what our resources are being used for?

is this what your lesson time is spent doing?

I have heard of some of your exploits.... wink.gif


Someone stole my Thunder...

#3 User is offline   pumarv6 

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Posted 14 December 2007 - 09:12 AM

So what now does the job of the bolt you had the trouble removing?


#4 Guest_jacko_*


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Posted 14 December 2007 - 04:13 PM

stainless steel bolts.......

the caliper is as new.......

thats what took so long!!!! could have easily drilled the whole thing out & slapped a nut on the other side.....but thatd be cr*p!

#5 Guest_Tiggr_*


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Posted 14 December 2007 - 04:22 PM

Perfect - when i buy my next Spitfire, I'll bring you the rear hubs to strip wink.gif

This post has been edited by Tiggr: 14 December 2007 - 04:23 PM


#6 Guest_jacko_*


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Posted 14 December 2007 - 08:06 PM

.

This post has been edited by jacko: 07 May 2008 - 06:47 PM


#7 User is offline   Midnight Blue 

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Posted 14 December 2007 - 08:29 PM

Is there nothing you can't turn your hand to, Jacko?

Talking of school, you might be able to help Ben finish his mod - he started it in August and is only quarter of way through laugh.gif
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I stole BenF's Thunder ...

Pat

#8 User is offline   BenF 

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Posted 14 December 2007 - 08:45 PM

you can go off people you know!


Someone stole my Thunder...

#9 User is offline   Midnight Blue 

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Posted 14 December 2007 - 09:18 PM

Go back to sleep, Ben laugh.gif
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I stole BenF's Thunder ...

Pat

#10 Guest_jacko_*


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Posted 15 December 2007 - 01:38 PM

what mod is this??????!!!!!!

ben id love to reduce your car to its major components; its had that little use i reckon i wouldnt even get my hands dirty!!!!!!!!!!!!!!!!!!!!!!!!!!!

#11 User is offline   happy-kat 

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Posted 15 December 2007 - 01:52 PM

the seized bolt on my LHD one was eventually removed with over night spark errossion!
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

#12 User is offline   BenF 

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Posted 15 December 2007 - 02:01 PM

QUOTE (Midnight Blue @ Dec 14 2007, 08:29 PM) <{POST_SNAPBACK}>
you might be able to help Ben finish his mod - he started it in August and is only quarter of way through laugh.gif



QUOTE (Midnight Blue @ Dec 14 2007, 09:18 PM) <{POST_SNAPBACK}>
Go back to sleep, Ben laugh.gif



QUOTE (jacko @ Dec 15 2007, 01:38 PM) <{POST_SNAPBACK}>
what mod is this??????!!!!!!

ben id love to reduce your car to its major components; its had that little use i reckon i wouldnt even get my hands dirty!!!!!!!!!!!!!!!!!!!!!!!!!!!



stop picking on me!

I thought I would see whether I liked what bit of my mod I have done before I did any more..


Someone stole my Thunder...

#13 User is offline   happy-kat 

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Posted 15 December 2007 - 02:05 PM

make sense of your signature now 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   BenF 

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Posted 15 December 2007 - 02:12 PM

I don't rush into anything, Kate wink.gif


Someone stole my Thunder...

#15 User is offline   Dogsbody 

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Posted 15 December 2007 - 02:47 PM

QUOTE (jacko @ Dec 14 2007, 04:13 PM) <{POST_SNAPBACK}>
stainless steel bolts.......

the caliper is as new.......

thats what took so long!!!! could have easily drilled the whole thing out & slapped a nut on the other side.....but thatd be cr*p!


Hi Jacko,
Be careful with stainless bolts ohmy.gif They are not always as strong as their mild steel counterparts.

Think of the pressures on the caliper bolts stretching them apart when you hit the brakes.
I usually use 8.8 bolts which are one down on aircraft quality.
I have seen stainless ones snap at work unsure.gif

Personally I would not use stainless to hold my calipers together. rolleyes.gif
They look good though mellow.gif
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#16 User is offline   happy-kat 

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Posted 15 December 2007 - 02:49 PM

I got replacement bolts as oroginal from PB and also the engineer shop got me a replacement bolt the same as the one they eroded. (thankfully not SS after reading the above)
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

#17 User is offline   eldoodarino 

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Posted 15 December 2007 - 03:54 PM

QUOTE (Dogsbody @ Dec 15 2007, 02:47 PM) <{POST_SNAPBACK}>
Hi Jacko,
Be careful with stainless bolts ohmy.gif They are not always as strong as their mild steel counterparts.

Think of the pressures on the caliper bolts stretching them apart when you hit the brakes.
I usually use 8.8 bolts which are one down on aircraft quality.
I have seen stainless ones snap at work unsure.gif

Personally I would not use stainless to hold my calipers together. rolleyes.gif
They look good though mellow.gif



6 bolts holding 2 caliper halfs together is very 'over kill'... the standard bolts are only bog standard steel bolts... not high tensile.... I'm using stainless bolts on mine.... there's no way they will fail with 6 of them in there...

you just have to be careful to add a little copper grease to the threads of the new bolts, as the 'virgin' thread can be a little harsh as it screws in for the first time......

they look quite nice too....





biggrin.gif

This post has been edited by eldoodarino: 15 December 2007 - 03:57 PM

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Posted 16 December 2007 - 12:59 PM

as above.....

always dubious of stainless bolts for doing 'proper' jobs due to their brittle nature but el-dood has pioneered the way & had no probs......

if i can get away with it i use stainless everywhere - lasts so much longer than everything else (well...titanium would be nice... but..£!!!!!!)

#19 User is offline   Dogsbody 

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Posted 16 December 2007 - 01:23 PM

They do look good and I know most motor bike calipers have stainless bolts on Alloy calipers.
But bikes are a lot lighter.

Standard good quality cap heads will be 8.8 tensile rated and I (work) have a endless supply rolleyes.gif
Image the stress and heat generated when you stamp on the brakes from say 70 mph, slowing a 1000Kg car down.
Trying to snap those six bolts on each caliper ohmy.gif

But thats just my opinion, but I have seen them snap where used under stress situations.
Plus I painted my calipers.



We only use Stainless at work where they are in a not stress / weight bearing use. Normally in a high corrosion area like a water bath.
I will use them on Wugsy, to hold his new mudflaps on wink.gif as we do have a good selection in stock.

This post has been edited by Dogsbody: 16 December 2007 - 01:25 PM

MK4 XR3i
Mk3 XR3i
R Reg 1.7 Puma
T Reg 1.7 Lux Puma
Now its Racing Puma 072

Graham

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#20 User is offline   maineman1963 

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Posted 16 December 2007 - 02:12 PM

Hia folks... good thread and what PP is all about !

Right folks a few things !

Stainless steel is actually a wide range of differing steels, dependent on what alloying elements is in it. More common stainless grades used are 304 and 316 which have Ni and Cr added which makes them "stainless" ... not an accurate name. more oxidation resistant as they will stain.... if for example salt is present in a moist environment eg sea spray. When stainless steel is stressed, as say a bolt is and salt is present it can corrode.

But .... 304/316 are not high strength steels, they are typically only as strong as a mild steel no more ! But they are not brittle just not very strong. They are used as they resist corroding so much better than mild steel.

Also stainless steel bolts have to have grease applied as they will be tricky to remove later because the steel "galls" .. means it sticks as you tighten it up as does titanium for example as some of the surface of the steel adheres to the body of what you are putting it in and is then hard to get back out.

Sorry for the lecture guys but stainless steel is not a solution to all problems and have their own problems. And yes I am a metallurgist in case you didn't guess !


ex-owner of FRP 347 believe it is now R.I.P ! ...... now driving ....................... yes.... a Mondeo diesel. so per my daughter I am now Mondeo man, after Scoobies, BMW M5 etc etc .... ex-wife probably thinks how the not so mighty have fallen !!!


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