wawasonqo Posted Friday at 04:37 AM Share Posted Friday at 04:37 AM Hi Folks, Hoping I don't have to do this but ... Looking at the Parts Fiche diagram doesn't show any differences but the pictures of the Caliper Piston Seals, shown on the Online Stores and page 15-40 of the service manual, indicate they are. Just wish to confirm the difference is correct? https://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_06451MZ2405/ https://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_06431MA3405/ https://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_06431MA3405P/ Is there another way to get the pistons out than the method described at the top of page 15-39 of the service manual? Thanks! Quote Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted Friday at 06:16 AM Member Contributer Share Posted Friday at 06:16 AM Would be helpful if you post "page 15-40 of the service manual," and "the method described at the top of page 15-39 of the service manual" Or do you expect folks to search for it to help you? 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer Skids Posted Friday at 08:09 AM Member Contributer Share Posted Friday at 08:09 AM There are kits available - Honda VFR 800 Fi-1 01 Parts at Wemoto - The UK's No.1 On-Line Motorcycle Parts Retailer - I used these guys for my Fi-1 brake overhaul If yr servicing the brakes, why not replace the brake hoses with braided lines? I'd recommend Galfer! Quote Link to comment Share on other sites More sharing options...
Member Contributer Skids Posted Friday at 08:19 AM Member Contributer Share Posted Friday at 08:19 AM I assume you mean this method below using air pressure. Yes, there are tools you can get like pliers in reverse that you pull the piston out with. I'm sure someone has another method though. Quote Link to comment Share on other sites More sharing options...
VeeEffArah Posted Friday at 09:33 AM Share Posted Friday at 09:33 AM Agree with Skids, but the air pressure method is the most direct and efficient. Some very old school guys use a grease gun, but is way too messy, IMO. Also, what "parts fische" are you using, as all the ones I see shows the piston sizes with the part numbers. So that would be confirmation of sizes for the corresponding seals for each. Quote Link to comment Share on other sites More sharing options...
JimMoore Posted Friday at 12:16 PM Share Posted Friday at 12:16 PM Before using the compressed air you can remove the pads and pump the brakes to get the pistons started. When you use the compressed air, keep your fingers out of the way. The pistons will pop out with an alarming quickness! Quote Link to comment Share on other sites More sharing options...
wawasonqo Posted Friday at 07:20 PM Author Share Posted Friday at 07:20 PM 11 hours ago, Skids said: I assume you mean this method below using air pressure. Yes, there are tools you can get like pliers in reverse that you pull the piston out with. I'm sure someone has another method though. @VeeEffArah Yep. Could a wooden dowel and a rubber headed hammer be used do you think? Quote Link to comment Share on other sites More sharing options...
wawasonqo Posted Friday at 07:39 PM Author Share Posted Friday at 07:39 PM 9 hours ago, VeeEffArah said: Also, what "parts fische" are you using, as all the ones I see shows the piston sizes with the part numbers. So that would be confirmation of sizes for the corresponding seals for each. I was referring to the images shown on the PartZilla website and in the SabMag/VFR List Microfiche & Manuals Electronic Reader Project PDF file (98vfr800partslist.pdf) which I think I downloaded from this forum yonks (long time) ago. The diagrams in the service manual provide a better representation I discovered later. Quote Link to comment Share on other sites More sharing options...
wawasonqo Posted Friday at 08:24 PM Author Share Posted Friday at 08:24 PM 12 hours ago, Skids said: There are kits available - Honda VFR 800 Fi-1 01 Parts at Wemoto - The UK's No.1 On-Line Motorcycle Parts Retailer - I used these guys for my Fi-1 brake overhaul Do you happen to have their email address? Quote Link to comment Share on other sites More sharing options...
Member Contributer Skids Posted Saturday at 06:18 AM Member Contributer Share Posted Saturday at 06:18 AM 9 hours ago, wawasonqo said: Do you happen to have their email address? Contact is in the link Quote Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted Saturday at 03:53 PM Member Contributer Share Posted Saturday at 03:53 PM If you have a little tyre air pump, you can use it to pop the pistons out. As previously stated remove the pads & then place them both loose in the caliper. Then use brake M/C to pump pistons most of the way out. Then remove the pads & hose & drain the fluid. If you don't have a piston puller, clean & wrap the exposed piston ends with tape. Use small mole grips on the taped areas to wiggle them out the last bit. If you are replacing the pistons then you can forgo the tape. If they can't be wiggled out from there then move to next phase. Most pumps have a plastic tapered filler with a s schrader valve end, for what I don't know, but if you shorten it, it can be threaded into the banjo hole. Connect your pump & use something to keep the loosest piston from popping out. The pressure will then be applied to the tight one. Job jobbed. Quote Link to comment Share on other sites More sharing options...
wawasonqo Posted Saturday at 03:58 PM Author Share Posted Saturday at 03:58 PM 3 hours ago, Mohawk said: If you have a little tyre air pump, you can use it to pop the pistons out. As previously stated remove the pads & then place them booth loose in the caliper. Then use brake M/C to pump pistons most of the way out. Then remove the pads & hose & drain the fluid. If you don't have piston puller, clean & wrap the exposed piston ends with tapeI. Use small mole grips on the taped areas to wiggle them the last bit out. If you are replacing the pistons then you can forgo the tape. If they can't be wiggled out from there then move to next phase. Most pumps have a plastic tapered filler for what I don't know, but if you shorten it, it can be threaded into the banjo hole. Connect your pump & use something to keep the loosest piston from popping out. The pressure will then be applied to the tight one. Job jobbed. Thanks. I have a bicycle pump. What is tapel? As per the following post, how do I debug what is happening at the Master Cylinder end? https://www.vfrdiscussion.com/index.php?/forums/topic/108993-rear-brake-bleed-delinkedde-linked-caliper-mounting/&do=findComment&comment=1149516 Quote Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted Saturday at 06:26 PM Member Contributer Share Posted Saturday at 06:26 PM What's wrong with using brake-fluid pressure to push piston out rest of way? As soon as piston clears end of bore, all pressure is released and it stops moving. Because fluid isn't compressed and there's little difference in volume between compressed and uncompressed fluid. Air-pressure on other hand, can build up quite high pressure depending upon how stuck piston is. It will continue to expand and push on piston even after it's out from caliper because compressed volume is so much smaller. Quite explosive and dangerous! 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer bmart Posted Saturday at 07:06 PM Member Contributer Share Posted Saturday at 07:06 PM How much do you enjoy being covered by brake fluid? Ask the other things nearby the same. 1 1 Quote Link to comment Share on other sites More sharing options...
wawasonqo Posted Saturday at 07:15 PM Author Share Posted Saturday at 07:15 PM 7 minutes ago, bmart said: How much do you enjoy being covered by brake fluid? Ask the other things nearby the same. As per the following post, how do I debug what is happening at the Master Cylinder end? https://www.vfrdiscussion.com/index.php?/forums/topic/108993-rear-brake-bleed-delinkedde-linked-caliper-mounting/&do=findComment&comment=1149516 Quote Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted Sunday at 01:34 AM Member Contributer Share Posted Sunday at 01:34 AM 7 hours ago, bmart said: How much do you enjoy being covered by brake fluid? Ask the other things nearby the same. Brake fluid doesn't come gushing out with explosive force! Watch the piston as you squeeze. As soon as piston leaves, you stop squeezing and get a tiny dribble, 1-2cc and that's it! Quote Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted Sunday at 07:53 AM Member Contributer Share Posted Sunday at 07:53 AM 6 hours ago, DannoXYZ said: Brake fluid doesn't come gushing out with explosive force! Watch the piston as you squeeze. As soon as piston leaves, you stop squeezing and get a tiny dribble, 1-2cc and that's it! correct! Pay attention that both pistons come out equally. One may have to "block" one (with 2 pads packed together) to allow the other one to "catch up" 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted Sunday at 10:38 AM Member Contributer Share Posted Sunday at 10:38 AM 8 hours ago, DannoXYZ said: Brake fluid doesn't come gushing out with explosive force! Watch the piston as you squeeze. As soon as piston leaves, you stop squeezing and get a tiny dribble, 1-2cc and that's it! Not using your method (which is what I do now), but if someone is using compressed air, it sure does! As I once sadly discovered, tiny droplets of brake fluid got everywhere in my garage--including on my other bikes' paintwork and windscreens. Some of those spots are still there to this day... Ciao, JZH 1 Quote Link to comment Share on other sites More sharing options...
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