romer
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| posted on 13/1/07 at 04:11 PM |
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URGENT TIN-TOP QUESTION PLEASE
Hi Guys,
I'm stuck in the middle of a job and am desperate for a bit of information please.
I'm renewing the back brake pads and maybe disks (haven't got the other side off yet), but can't get the caliper piston to return
inside the caliper.
The car is a "54" plate VW Bora with non-vented rear disks with handbrake incorporated into the caliper (ie no seperate shoes) - I'm
told it's the same set-up as the mk4 Golf.
I've removed the reservoir lid to allow fluid expansion and have tried (but not too hard in case I brake anything) to force the piston back in
using a G clamp across the piston face and the rear part of the piston housing.
The two bolts have been removed to split the sliding part of the caliper so the sliding part is seperate and being held by the handbrake cable and
fluid line.
Any suggestions please as I'm about pulling out what is left of my hair.
I'm fairly convinced I've missed something simple . . . but sometimes you can't see the wood for the trees.
Heres hoping 
Romer
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David Jenkins
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| posted on 13/1/07 at 04:15 PM |
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Is the brake pedal fully back to its normal position? Only then will it allow fluid back into the reservoir.
HTH
David
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Jon Ison
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| posted on 13/1/07 at 04:21 PM |
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Have a look round the caliper for some sort of "wind back" mechanism I remember on the Gti golf you had too wind the pistons back in, its
some sort of self adjusting your looking for, just a guess but i think that is what it will be, maybe even the piston its self will wind in.
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scottc
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| posted on 13/1/07 at 04:21 PM |
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I think you have to turn it back in. Don't think you can just push it in.
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Simon
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| posted on 13/1/07 at 04:21 PM |
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Is it a screw in piston - may not be smooth but "castelated" sort of thing.
Screw in is for the handbrake self adjustment.
ATB
Simon
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asn163
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| posted on 13/1/07 at 04:21 PM |
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Just a suggestion.
Don't. know if the golf is the same as a focus, but IIRK on the ford you also have to screw the piston into the caliper as you apply
pressure.
Great minds obviously think alike!
Simon
[Edited on 13/1/07 by asn163]
[Edited on 13/1/07 by asn163]
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PAUL FISHER
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| posted on 13/1/07 at 04:24 PM |
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Never done a bora rear brake reline,but other rear brake calipers I've come across,have a self ajusting mechanism built in,which you have to
turned the piston,to ensure it returns to its original position,to when the pads were new,for example on the ford sierra rear caliper,there is a
special tool for doing this,but you can do it with a pair of long no pliers,so see if you can screw the caliper piston back in some how,good luck
don't you just hate it when everyone can type faster than you
[Edited on 19/05/04 by PAUL FISHER]
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romer
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| posted on 13/1/07 at 04:25 PM |
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Thanks for those comments guys, will check them right now.
The pedal should be at the top as the spring should be holding it there, but will check that as well.
I did notice some cross (semi castleation (sp) on the piston) will check and see if I can turn it.
Any ideas if that thread would be different depending on which side of the car it was, ir will it just be a standard thread??
Cheers
Romer
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romer
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| posted on 13/1/07 at 04:27 PM |
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I'm going to try those things now - will report back.
If anyone has any other comments I'd appreciate them.
Romer
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Jon Ison
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| posted on 13/1/07 at 04:28 PM |
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Pretty sure that will be it, you asked the audience and got a 100% screw it back in answer........... locostbuilders at its best.
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Simon
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| posted on 13/1/07 at 04:39 PM |
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I would have been first but wasn't logged in when I sent my reply, and got the "no anonymous posting" message!
ATB
Simon
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meany
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| posted on 13/1/07 at 05:21 PM |
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a quick search on google, came up with this...its for a golf i know.
http://www.autoblog.com/2006/07/06/autoblog-maintenance-201-brake-pad-replacement-part-ii/
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romer
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| posted on 13/1/07 at 06:14 PM |
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quote:
Originally posted by meany
a quick search on google, came up with this...its for a golf i know.
http://www.autoblog.com/2006/07/06/autoblog-maintenance-201-brake-pad-replacement-part-ii/
Thanks for tha "Meany" - I had googled to try to find something, but couldn't. The calipers in those pictures look just like
mine.
I still can't get the b#&&*@ back in   .
Will have to see if halfords sell those tools tomorrow
Thanks again everyone for your promt and helpfull suggestions.
Romer
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ned
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| posted on 13/1/07 at 06:15 PM |
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my dad's octavia is the same car and they need screwing in using a tool, bought or fabricated to rind the caselation in on the piston.
Ned.
beware, I've got yellow skin
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andybod
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| posted on 13/1/07 at 06:36 PM |
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probably a bit late now but after you have wound the calipers in and put your new brakes in and refitted the calipers DONT touch the hand brake till
you have pumped the brakes out otherwise you will unwind the hand brake mechanism off the piston at best strip and rebuild caliper at worst replace
caliper
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romer
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| posted on 13/1/07 at 07:49 PM |
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quote:
Originally posted by andybod
probably a bit late now but after you have wound the calipers in and put your new brakes in and refitted the calipers DONT touch the hand brake till
you have pumped the brakes out otherwise you will unwind the hand brake mechanism off the piston at best strip and rebuild caliper at worst replace
caliper
GOOD point.
No, it's not too late. Other matters have taken over and I've had to leave it now.
Will try to get a special tool tomorrow if halfords have one.
Just couldn't get that piston back in at all - damn, beaten by a tin-top!!
Thanks again folks - going home now and probably log on again later.
Romer
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DIY Si
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| posted on 13/1/07 at 08:00 PM |
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I've used am angry grinder key to screw them in before. Not sure if it'll fit your calipers though.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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raccoonradar
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| posted on 13/1/07 at 09:35 PM |
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If you do get the piston back, make sure when you fit the pads get the peg on the pads lined up with the notch in the piston when fitting them
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romer
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| posted on 15/1/07 at 10:06 AM |
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Finally got them sorted on sunday - bought the caliper piston tool from halfords - £19.99 - not too bad I don't suppose.
Trouble is the packaging didn't list it as being suitable for VW's though. As it happened, it was bang on.
Thanks again for all the helpfull suggestions.
Romer
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Simon
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| posted on 15/1/07 at 08:43 PM |
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quote:
Originally posted by romer
Finally got them sorted on sunday - bought the caliper piston tool from halfords - £19.99 - not too bad I don't suppose.
Trouble is the packaging didn't list it as being suitable for VW's though. As it happened, it was bang on.
Thanks again for all the helpfull suggestions.
Romer
Cool, you can put the plans up now, so we can all make one
ATB
Simon
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