mick600 Posted February 1, 2012 Posted February 1, 2012 Im doing a full overhaul on the front brakes of my '95 Foxeye, during which Ive split the calipers. Does anyone know where I can get replacements for the small 'o' rings that seal the 2 caliper halves? Ive looked everywhere I can think of online but come up with nothing. I really dont want to put the old o rings back in as they are likely to be as old as the bike and I wouldnt trust them. They are the original 4 pot Sumitomo calipers if that helps. Thanks in advance to anyone that can help.
Moderator drewpy Posted February 1, 2012 Moderator Posted February 1, 2012 they have some here http://www.cmsnl.com/yamaha-fzr600-rhc-1996_model10287/partslist/E-06.html
YPVS TONE Posted February 1, 2012 Posted February 1, 2012 Hi mick600 I've got a Yamaha Technical bulletin about these O rings fitted to Sumitomo callipers and it gives part numbers depending on what caliper is fiitted. You say they are 4 pot calipers. If the 4 pistons in the caliper are all the same size it gives the part number as # 90891-85001-00 x 2 per caliper. If the 4 pistons are two different sizes it gives the part number as # 90891-82715-00 x 2 per caliper. You can give a Yamaha dealer a call to see if they are still available. The bulletin also give a torque setting for the bolts that hold the two halves together for the 4 pot calipers as 2.5 - 3.3 kgf-m. It also say's : 1. DO NOT clean internal parts with a solvent as this may damage rubber parts. Use fresh brake fluid. 2. Ensure you use the correct " O " ring for each caliper type. 3. Apply a small amount of silicon G40 grease part number # 90890-SG40M to the "O rings" 4. Upon assembly apply new brake fluid to the first 2 or 3 threads of the calper bolts which hold the two halves together. 5. Locate the "O" ring in the groove which is in one half of the caliper. 6. Make sure that the "O" rings are properly seated before the 2 halves of the caliper are fitted together. 7. Tighten cailpers to the correct torque. IMPORTANT The above information only applies to machines fitted with SUMITOMO brake calipers and DOES NOT relate to any other makes of calipers. Hope this helps .Tony
mick600 Posted February 1, 2012 Author Posted February 1, 2012 Thats fantastic help lads thank you. Like I said Ive pulled everything apart. Cleaned the bores and everything with brake cleaner (If that counts as a solvent then hopefully it wont matter as Im changing all the seals anyway) and blown thru with an airline so that everything is looking shiney and new. The new piston seals came today. The silicone G40 grease you refer to. Is that the red rubber grease? If so should I apply that to the piston seals as well as the o rings? Ive read that some people smear them in fresh brake fluid instead so Im a little unsure which method to use. Thanks again for all the help so far.
Moderator drewpy Posted February 1, 2012 Moderator Posted February 1, 2012 brake fluid will swell the rubber, I wouldn't do it!
YPVS TONE Posted February 2, 2012 Posted February 2, 2012 I know some people use the red grease to lube the seals but you only need a very fine smear as if you use too much it sits in the seal grooves in the caliper and stops the seals from sitting in the grooves properly. I don't think brake fluid will be a problem as it is in fact what is recommended in the Genuine Yamaha Service manuals to clean and lubricate internal parts of the caliper using new brake fluid and when you think about it the seals will be in contact with it anyway.
mick600 Posted February 27, 2012 Author Posted February 27, 2012 A quick update to this in case anyone else is having the same trouble I was finding these caliper joint seals. The only place I could find that sells them is a company called Powerhouse who are brake specialists and trade on Ebay. I ordered 4 at about £3 each and they arrived a couple of days later. They do them in a few sizes so you should be able to get what you need from them. Hope that info could help someone in the same boat as I was in.
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