thepest
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| posted on 25/3/08 at 11:32 AM |
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Rebuilding calipers
I am rebuilding a set of front calipers of my ford escort Mk2, should I need to hone the piston socket? I have taken them apart and given them a
complete cleaning. Any advice before I reassemble with the new rubbers?
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Mr Whippy
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| posted on 25/3/08 at 11:35 AM |
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I thought the piston bore was chromed?
what kind of damage is there
[Edited on 25/3/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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itiejim
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| posted on 25/3/08 at 12:44 PM |
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I've only ever seen chromed pistons and "bare" bores. I don't think I'd hone them though, just make sure they're
super clean.
If you think they actually need honing then they're probably kn@ckered!
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RazMan
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| posted on 25/3/08 at 02:23 PM |
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A wipe with some Scotchbrite to remove any oxidation is all I would do - you don't need to hone them and if it looks as though you do ....
they're probably knackered 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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thepest
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| posted on 25/3/08 at 03:14 PM |
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There is no damage inside the piston bore, and the pistons all have some light pitting just under the dust cap. I cleaned them properly and used a
light 500grit sandpaper and parafin on the pitted part.
I'll get a photo taken of the worst piston and I will post it.
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Bluemoon
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| posted on 25/3/08 at 04:38 PM |
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If the chrome coating is pitted on the piston on the part that slips past the seal they are fit for the bin... The corrosion will only get worse. You
can't really fix them better to get new pistons (bigRed can supply stainless steel ones, these shouldn't pit and if they did you might get
away with you method on them as they are not chrome plated)..
If the pitting is between the dust seal and the seal you might get away with it, but the rust will get worse with time..
Photos will help...
Dan
[Edited on 25/3/08 by Bluemoon]
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dmac
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| posted on 25/3/08 at 07:40 PM |
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I've just rebuilt my M16 calipers and can confirm that the bores should just be cleaned. You can rebuild with slight rust to the pistons if you
gently smooth the surfaces down but it will seriously reduce the life of the seals and is only a temporary solution (I did this because I needed the
car running for a test day the following weekend). If you can get hold of some new pistons then that is much better.
Duncan
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