Full Version: Rear Caliper Seal
I am in the process of rebuilding my rear brake calipers. I noticed the square “O” ring seal for the outer adjustment screw was not included in the rebuild kit. Is there a replacement for this?
The adjuster O-ring seals may be available in some kits, but not all. I think Part Works of Chicago has these seals available. The advertise on Ebay all the time. It would be better to contact them directly to save time and cost though. The seals themselves are not easy to find. I looked for years without success.
DaveP
DaveP
I've seen these seals. They cost as much as the rebuild kits!
I ordered rebuild kits form pelican. These are complete kits except for the dust boot retainer (which too big) must be trimmed and the adjusting screw O-ring is wrong. This O-ring is too small in cross section and is circular instead of square. I am tempted to remove the square seal and measure the seal groove on the screw. (I have a lot of seal supplier contacts, through work, that will go out of their way to help me). But I’m concerned that if I damage the seal and my resources can’t find a match, I’ll have a worthless caliper!
Does anyone have a spare screw available that can be measured? If so I need the seal groove I.D. and the groove width measured. I may find a cheaper replacement.
I ordered rebuild kits form pelican. These are complete kits except for the dust boot retainer (which too big) must be trimmed and the adjusting screw O-ring is wrong. This O-ring is too small in cross section and is circular instead of square. I am tempted to remove the square seal and measure the seal groove on the screw. (I have a lot of seal supplier contacts, through work, that will go out of their way to help me). But I’m concerned that if I damage the seal and my resources can’t find a match, I’ll have a worthless caliper!
Does anyone have a spare screw available that can be measured? If so I need the seal groove I.D. and the groove width measured. I may find a cheaper replacement.
It would take me a little while to get the info for you. May be as late as Monday to get a set of verniers on a screw. I "think" it may be a 4mm ID x 5mm OD ring. I'll take at least 20 rings if you can find them at a decent price. And yeah, the seal kits are way overpriced.
DaveP
DaveP
That would be great Dave. I need the measurements taken to .XXX in or .XX mm. Thanks.
911/914Gary,
If you can find a replacement I'd be interested in buying a couple of pair. Let us know when and how. Good luck.
Mike
If you can find a replacement I'd be interested in buying a couple of pair. Let us know when and how. Good luck.
Mike
Partwerks advertises them.
I just got the adjuster out of the caliper. The nut was really screwed up. Wrong one also.
The outer adjuster has an O-ring groove and I measured the diameter of the groove as 0.250" . Yeah, not metric at all. Was I surprised! The O-ring split when I tried to remove it, but it measures 0.040" cross-section. The width of the groove is over 0.050" and definitely under 0.062"
DaveP
The outer adjuster has an O-ring groove and I measured the diameter of the groove as 0.250" . Yeah, not metric at all. Was I surprised! The O-ring split when I tried to remove it, but it measures 0.040" cross-section. The width of the groove is over 0.050" and definitely under 0.062"
DaveP
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