front brake caliper overhaul
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From: Covington WA, USA
front brake caliper overhaul
Page 19-15 of the 2002 Helm manual:
Shows to grease the pins, pin boots, piston boot, and piston seal. The overhaul kit (014630S2A-000) comes with three packets of grease. An orange one that is labeled "pin moving portion", a red one that is labeled "dust cover of caliper, cup of master cylinder, cosmo rubber grease", and a clear one that appears to be the mystical "shin-etsu chemical".
OK, so the orange one goes on the pins. The red one goes on the dust seal. But which one goes on the pin boots? Which one goes on the piston seal ring? And where does the shin-etsu go?
And WTF is shin-etsu anyway?
Shows to grease the pins, pin boots, piston boot, and piston seal. The overhaul kit (014630S2A-000) comes with three packets of grease. An orange one that is labeled "pin moving portion", a red one that is labeled "dust cover of caliper, cup of master cylinder, cosmo rubber grease", and a clear one that appears to be the mystical "shin-etsu chemical".
OK, so the orange one goes on the pins. The red one goes on the dust seal. But which one goes on the pin boots? Which one goes on the piston seal ring? And where does the shin-etsu go?
And WTF is shin-etsu anyway?
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Joined: Apr 2003
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From: Covington WA, USA
So, shin-etsu on the pin boots. But I'm assuming this red cosmo stuff is used on the piston seal and the piston dust boot -- it out and out says it is used on the piston dust boot.
Edit: just found this thread.
http://forums.s2ki.com/forums/index.php?showtopic=199463
Looks like other people have made the same guess.
Edit: just found this thread.
http://forums.s2ki.com/forums/index.php?showtopic=199463
Looks like other people have made the same guess.
Joined: Mar 2001
Posts: 37,305
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That's the trouble when they try to translate Japanese into English - you just never know what they mean. I'd make sure that the red stuff gets used anywhere near the bits that get really hot, like on or near the piston. The Shin-etsu? Use for any rubber bits that is removed from the really hot bits. Pin boots? Bleed screw cap?
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From: Covington WA, USA
Originally Posted by hecash,Dec 24 2004, 09:57 AM
Use the semi-clear (ShinEtsu) on all of the rubber parts except the main piston seal, the main piston boot and the pin boots. I used the red grease on the main piston seal, main piston boot and the pin boots. I used the orange grease on the floating pins and the floating pin channels.
Don't forget to swap the piston cavity, piston and piston seal grove with a light coating of new, clean brake fluid. You can use a Q-tip to swab the brake fluid to avoid getting it onto your hands, painted parts or your cloths.
If you have a pair of small hemostats, you'll find them very convenient to hold a couple of points on the piston boot to the inside near the caliper body where your fingers will not reach while you are re-installing the piston. It actually makes the re-install very easy.
Install the boot first. You can then clip the hemostats onto the boot lip prior to installing the piston. Even though the boot is greased, you can get a good grip onto the outer lip if you wear surgical latex gloves. Slide the piston into the outer perimeter of the boot first and then pull the inside lip of the boot over the otherwise unreachable back side of the piston using the hemostats.
Don't forget to swap the piston cavity, piston and piston seal grove with a light coating of new, clean brake fluid. You can use a Q-tip to swab the brake fluid to avoid getting it onto your hands, painted parts or your cloths.
If you have a pair of small hemostats, you'll find them very convenient to hold a couple of points on the piston boot to the inside near the caliper body where your fingers will not reach while you are re-installing the piston. It actually makes the re-install very easy.
Install the boot first. You can then clip the hemostats onto the boot lip prior to installing the piston. Even though the boot is greased, you can get a good grip onto the outer lip if you wear surgical latex gloves. Slide the piston into the outer perimeter of the boot first and then pull the inside lip of the boot over the otherwise unreachable back side of the piston using the hemostats.
I assume the brake fluid is to make sure there is no water residue on the surfaces? Or is it just a lubricant?
I don't have any hemostats and I'm not quite picturing what you mean, but I assume it will make more sense when I actually try to do it. Right now everything is disassembled in my living room except I need to find some pressurized air to blow the pistons out of the cylinders. I can't just pull them out like I was expecting to be able to do. Is it worth buying some hemostats?
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From: Covington WA, USA
I used my dad's air compressor to pop the pistons out. Glad I thought ahead! I stuck a piece of wood where the brake pad would be and kept my fingers out of the way. When that piston popped out, it put a serious circular dent into the wood. And I didn't even have a seal on the input line -- I just held the air nozzle up to the hole where the banjo bolt attaches.
I was in the hardware store and did buy a couple hemostats today.
I was in the hardware store and did buy a couple hemostats today.
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