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Post by noakira on Aug 14, 2011 9:55:34 GMT 1
Hello Fellow Revere Lovers....... "the VW camper of the bike world !" Was struggling to get out 2 very seized pistons out of a rusty front brake caliper thats been static for 5 years (under a bush). Tried my usual Bike Stirrup pump in the open bleed nipple trick, no joy. Connected a spare reservoir / brake handle and re-bleed. Pulling the brake handle made a few bubbles appear and still no joy. These pistons were well and truly stuck. What I needed was a Piston Extractor tool ? Had a quick rummage through my nut & bolts box at the back of the garage and found a 12mm expander type wall plug bolt, plus a 2.5" M12 bolt and a M12 nut. In another box I found a 2" x 1" backing plate. Within 5 minutes i'd cobbled together a Caliper Piston extractor tool ! Within the next 30 minutes I'd removed 6 pistons from 3 front brake calipers, which hadn't been touched in years. dl.dropbox.com/u/17863650/Caliper_ext/caliper_ext_01.JPGdl.dropbox.com/u/17863650/Caliper_ext/caliper_ext_03.JPGPicture of M12 crossed expander bolt dl.dropbox.com/u/17863650/Caliper_ext/caliper_ext_04.JPGNOTE: The calipers are off the bike and placed in a vice. You need a vice for caliper overhaul work if you want an easy time of it. I've got 4 more of these M12 expander bolts if anybody is interested in building their own extractor tool ? You will need to source M12 bolt / nut / backing plate / washer. email: n o _ a k i r a @ntlworld.com (delete spaces). First 4 people to contact me gets them, gratis. Must be bonafide Revere lover, need to see the tattoo !
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Post by noakira on Aug 14, 2011 10:53:31 GMT 1
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Post by rj2para (Bisto) on Aug 14, 2011 14:01:12 GMT 1
Hi noakira,
Handy tip, if you still have the parts handy a shot of it in the vice would be interesting. I am yet to see my calliper in parts, so I can't quite picture if you are pushing them out with your new tool or pulling.
I plan to buy a replacement set of callipers over the next few months to give myself the time to study how they work.
I borrowed a rear shock of Mcf a couple of years back and it saved me overhauling mine when I could clearly see what the various adjustments were for.
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Post by noakira on Aug 14, 2011 14:25:35 GMT 1
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Post by rj2para (Bisto) on Aug 14, 2011 15:29:45 GMT 1
Words from ebay; thanks for the link noakira. " Tap the anchor tube into the piston, turn the upper bolt a few turns to lock the piston onto the tool. Start turning the lowermost nut against its backing plate to slowly and easily remove the piston. This has been tested on completely seized calipers (basically a rusty blob) and has pulled the pistons with ease. This even works when the piston is completely flushed within the caliper body However this tool only works on Honda models with internally lipped caliper pistons with a 12mm opening. This is NTV / Revere / VFR Honda's from the early to mid 90's. " image Parts 12mm expander type wall plug bolt 2.5" M12 bolt M12 nut 2" x 1" backing plate
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Post by noakira on Aug 14, 2011 16:02:05 GMT 1
Hello Bisto seen your gallery project and your red revere ? That is a fantastic restoration, good as new or even better !
I don't know if that is your pictures of the electric bike project ?
Hopefully it is because i've got a "cunning plan" project myself envolving motor windings that I wouldn't mind discussing with somebody knowledgeble.
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Post by rj2para (Bisto) on Aug 14, 2011 17:49:40 GMT 1
They say the camera never lies, " Hello Bisto seen your gallery project and your red revere ? That is a fantastic restoration, good as new or even better ! " She does not look as good close up. But I thank you for your comments. Like many other bikes on here though she is much loved. Re: "I don't know if that is your pictures of the electric bike project ?" ED-CASE is the man you need for lecy bike projects. Details and pm potential below. ED's project has since made it to the track. Feel free to ad your project to the electrical section. www.ntvhonda.proboards.com/index.cgi?board=electrictwowheelers&action=display&thread=1570
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Post by noakira on Aug 27, 2011 11:20:23 GMT 1
Well I've got the website up for this tool, its still under development as is the tool. www.ex-caliper.co.uk - the "Easily Xtract Caliper" pistons tool (play on Excalibur as in Arthur & Sword-stuck-in-stone !) Still on the look out for a machinist to make the Aluminium collar for the rear piston ?
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Post by rj2para (Bisto) on Aug 27, 2011 12:29:06 GMT 1
Your site is looking good so far.
Let me know when you want to go live and I will add a link to my site.
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slow
Ahh! Just passed their bike test
Posts: 43
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Post by slow on Jan 1, 2012 22:22:53 GMT 1
good tool (i´m using pneumatic (or brake pump) pressure and wooden block)
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Post by noakira on Jan 3, 2012 7:36:41 GMT 1
I'm still trying to find someone with a lathe to produce the split collars so I can sell the tool as a complete kit. I've got a hundred kits just waiting to be assembled with the matching collars. Basically a split collar for the rear caliper. 28mm with a 15mm hole then split for slight expansion. Been looking into Conquest lathes over at Chester tools. Anybody know of one going second hand? Perhaps an Arduino CNC project in the making. Save me milling me own fingers ! www.chesteruk.net/products/Product.aspx?productID=2
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Post by ilegalalien on Jun 4, 2012 16:08:40 GMT 1
nice tool, am gonna try n make myself one, one for the back i want as well if you manage to get this collar sorted...
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Post by noakira on Jun 5, 2012 13:49:25 GMT 1
You don't need a collar for the front brake caliper on the revere as there is a washer welded inside the piston with a 15mm (ID = inner diameter) hole in which the anchor fits snuggly. Still trying to find a retired machinist with a lathe either Aluminium or mild steel bar will do the rear collar.
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Post by ilegalalien on Jun 5, 2012 14:07:15 GMT 1
Some front calipers i've got on the pistons they have no washer welded inside, am thinking they might be patent pistons.. they measure 22.5mm inside...
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Post by ilegalalien on Jun 6, 2012 19:53:54 GMT 1
mystery solved... pulled a pair of Revere and NTV pistons out today with a bolt 2 washers and 2 nuts... the NTV pistons were knakkered so i welded a nut inside the 22.5mm inside, worked a treat... so to clarify the differences in calipers... Revere (NTV) model J, K, M, P piston is 30mm.. these am guessing have the washer inside NTV model S and T model piston is 27mm these am guessing have no washer inside (well mine) It pays to know which caliper you have before puchasing the new seals
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