ned
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| posted on 11/9/03 at 10:12 AM |
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help with rebuilding m16 calipers please!
Last night I strippd one of my m16 cortina calipers right down (pads out, spilt caliper, took off all bleed nipples + brake lines + seals).
I intend fitting capri 2.8i vented discs which is why i split the calipers (will be getting the spacer kit from rally design)
I have the seals off the pistons, only problem is i'm not sure what to do now! How can I tell if the pistons are ok? I can't move them as
they're pushed right back into the caliper.
Should I remove the piston? if so how (haven't got a cortina manual!) I'll get the rebuild kits from gts and know he does pistons as well
if necessary.
Is anyone with a cortina manual with any detail on rebuilding m16 calipers willing to scan any relevant pages in or offer advise?!
Thanks,
Ned.
beware, I've got yellow skin
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timf
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| posted on 11/9/03 at 10:29 AM |
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tools required pair of screw drivers.
on the pistons there is a lip that the two screw drivers are used to pry against to ease the pistons out. then check for corrosion pitting etc of ok
replace seals and reassemble.
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locoboy
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| posted on 11/9/03 at 11:04 AM |
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woooh steady there, before you go lunging in with the screwdrivers.
The easiest way is to re-assemble the caliper and attach it to the brake line and use the pedal to move the pistons out.
at least you will know for next time!
I damaged the lip on one of my pistons and the seal will not be water/dirt tight now.
These take some effort to remove with screwdrivers and skinned knuckles aplenty.
IMHO i would refit and use the more controlled method of the pedal.
I just fitted the vented disks and caliper spacers from rally design.
Make sure the spacers they supply you with (to move tha caliper assy over into the center of the new disk) are big enough to allow the 2 upright bolts
to go through, mine were not. Had to get the girlfriends dad to turn me some at work.
This kit doesnt look very pretty at all, the spacers you put inbetween the 2 halfs of the caliper are about 2-4mm oversize and poke out of the middle
of the caliper. Some carful and accurate grinding is required to make a neat job of it.
Col
ATB
Locoboy
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ned
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| posted on 11/9/03 at 11:10 AM |
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thanks for the info so far...
trouble is col, i never had the brakes on the car, neither do i have a spare brake system to attach the calipers to to try and ease the pistons
out!
will bear in mind the comments about the spacer kit though!
I guess it'll be the largest, flatest screwdriver i can find, used with carefully applied pressure to ease the piston out. I'm not exactly
sure what amount of pitting/wear is acceptable so i'll probably post a pic once i've got em out!
thanks,
Ned.
[Edited on 11/9/03 by ned]
beware, I've got yellow skin
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Chris Leonard
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| posted on 11/9/03 at 11:16 AM |
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To get the pistons out use an air line and a compressor. One will pop out (or fly out so be carefull). You then need to push this one back in and
clamp it - put the air line on again and the other one will come out. by doing this a couple of time you will free it up enough to get them both out
fairly easily
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locoboy
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| posted on 11/9/03 at 11:38 AM |
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Ned,
Didnt realise they were stand alone so to speak.
If anything like mine i would definately try an alternative method of removing them, it took me hours to get them out, levering them out a bit then
knocking them back in, out again in again and so on, also they are not too easy to clamp in the vice due to their shape.
I really need to get new pistons for mine, they are corroded at the base and need taking out and cleaning twice a year so stop them siezing. £15 a
piston and 20 quid for the seals £80 to recon the brakes, i will stick with taking them apart every 6 months, more fun anyway!
col
ATB
Locoboy
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suparuss
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| posted on 11/9/03 at 02:59 PM |
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i took mine apart a couple of weeks ago and used compressed air, had already split them tho so had to put a rubber seal on me air gun and press it
against the hole in the joint. its a good idea to wrap a rag or something around it so you dont damage anything. (or send a piston flying across the
workshop at warp factor 12 like me  )
Russ.
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ned
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| posted on 11/9/03 at 03:14 PM |
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its looking like i won't have any time to have another go until next week, may well give the compressor thing a go..
beware, I've got yellow skin
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Dick Axtell
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| posted on 11/9/03 at 04:51 PM |
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Caliper Strip Manual
quote:
Originally posted by ned
Is anyone with a cortina manual with any detail on rebuilding m16 calipers willing to scan any relevant pages in or offer advise?!
Ned, from experience, this type of info creates a huge file when scanned in. Adobe pdf files are usually the biggest, but jpg's can also exceed
1mb, because each character is a pic!
Let me know if you still want this info; it might be easier to simply photocopy and mail the pages.
ATB
Dick
Work-in-Progress: Changed to Zetec + T9. Still trying!!
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ned
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| posted on 12/9/03 at 08:27 AM |
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Dick,
thanks for the offer, i think i'll see how i get on at the moment, but may well get back to you if i get stuck!
thanks again,
Ned.
beware, I've got yellow skin
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DaveH
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| posted on 16/9/03 at 08:12 PM |
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Ned,
you have U2U
Dave
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harryman
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| posted on 16/9/03 at 08:23 PM |
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ned is serously nutty is he from nutty land
[Edited on 16/9/03 by harryman]
[Edited on 16/9/03 by harryman]
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ned
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| posted on 30/9/03 at 10:01 AM |
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Right, got the pistons out of the calipers last week using the screwdriver technique. very straight forward, came out quite easily. one piston is
spotless, another has a slight mark on one side (see pic below). though with the seals removed they both move up and down in the calipers easily.
should i try a bit of very fine wet+dry to remove the mark or leave well alone?
Apart from that it all went quite smoothly on the brakes front...
thanks all,
Ned.
beware, I've got yellow skin
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Mix
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| posted on 1/10/03 at 09:15 AM |
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If the mark is corrosion then the best course of action is to bin the piston, (it will never heal itself).
If its muck, (engineering term for sh!te) you should be able to scrape it off with a fingernail or soft scraper in which case you can then polish away
the residue with Autosol or T-cut
Mick
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Chazzy
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| posted on 1/10/03 at 04:17 PM |
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Libraries have loads if old car manuals usually stashed away in a back room, got all my cortina info from there.
Recon M16 callipers are not really expensive about 40 quid, but not locost i suppose
Also see thuis months Kitcar, big article on reconning brakes.
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ned
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| posted on 1/10/03 at 04:24 PM |
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should have a cortina manual coming my way soon. oh and i wanted to recon hte brakes for the exercise/experience and to see the insides of the
calipers...
Ned.
beware, I've got yellow skin
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Hornet
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| posted on 2/10/03 at 08:51 AM |
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For info..... Calipers for Cortina and mk2 Escort appear to be identical.
Same part numbers for spares /pads etc.
i have both and can not see any visable diff that would matter?
Anyone know if this is correct?
Cheers
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ned
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| posted on 2/10/03 at 08:58 AM |
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i *believe* the ford m16 caliper was quite popular and used on several models, so if they look the same they probably are!
all IMHO of course...
Ned.
ps check my website if you want to see more pics of the calipers..
beware, I've got yellow skin
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suparuss
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| posted on 2/10/03 at 09:17 PM |
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yep, i got some moprod seals, and on the box there is a long list of cars they fit. i would assume they are the same calliper if the seals go on them,
but there are the cortinas, capri, a rover something or other and several triumphs. ill post the whole list tommorrow if you like.
Russ.
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Sheepy
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| posted on 8/10/03 at 12:08 PM |
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M16 stripping
I'm jsut about to start doing the same M16 strip down and have some more questions: could somebody give me an example of car, model and year
that will get me into the middle of M16 territory. Are there any seals between the two halves of the caliper..a bike calliper i had not long ago had
rubber o-rings to clamp together. Do the halves have to come apart?, will the pistons slide out sideways when loose from the bore? Oh and the disks
that go with these calipers, are they as common as the caliper? Thanks Sheepy
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locoboy
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| posted on 8/10/03 at 12:29 PM |
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Sheepy,
Dont know what years they were available on but most Cortinas and old escorts had them.
There are rubber o rings between the 2 halfs, only one per calliper, apparently there can be v hard to replace.
The disks are easily come by too, new solid ones will be less than £15 each, or go for the vented disk with the calliper spacer kit which included new
o rings and calliper bolts from rally design £20 odd for the kit and £20 odd each for the disks (IIRC)
ATB
Locoboy
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ned
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| posted on 8/10/03 at 01:01 PM |
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m16's: cortina mk4/5 (not estates as some had different brakes) 1976-82ish
my capri 2.8i vented discs, £41pair from rally design and spacer kit £23.50ish
yep, rubber o-rings between caliper halves as col says. only reason i split them was to put the spacer kit in. You might get away with leaving them in
one piece if you can get the pistons out to do the seals.
Ned.
[Edited on 8/10/03 by ned]
beware, I've got yellow skin
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eddymcclements
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| posted on 8/10/03 at 03:52 PM |
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Cooncidentally there's a 2 page article in this month's Kit Car magazine about refurbishing calipers, and the model they seem to have used
as an example is Ford's M16.
Judging by the accompanying photos it might be a re-print of an old article but it's still relevant.
Eddy
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