kjclark7 Posted May 12, 2008 Share Posted May 12, 2008 the other day when i was changing my brake and clutch fluid i took out my brake pads to check them. when i took the bolt/pin out to check the pads, the small 0 ring on the end was shot (it was elongated). what purpose does it serve? i put the bolt back in for now since the honda dealership wasn't open today or yesterday. i am also still on my first set of pads at 21,000 miles, seems like good life out of the stock pads. there was a good amount of pad left so i kept them on. i have new ebc's when they eventually wear out. Quote Link to comment Share on other sites More sharing options...
kjclark7 Posted May 12, 2008 Author Share Posted May 12, 2008 nothing yet...i guess its not an important part Quote Link to comment Share on other sites More sharing options...
Mikey Posted May 12, 2008 Share Posted May 12, 2008 Nah, people would post even if it wasn't important. It might be a slow day on the board. Can you snap a pick of the pin and the o ring placement? Quote Link to comment Share on other sites More sharing options...
kjclark7 Posted May 13, 2008 Author Share Posted May 13, 2008 i won't be able to today but if you were to take the bolt out, the O ring is on the opposite side of the threaded end. i just ordered some from honda but the parts guy i spoke with didn't know what it was for. Quote Link to comment Share on other sites More sharing options...
jon haney Posted May 13, 2008 Share Posted May 13, 2008 My guess is that it helps prevent vibrations from the pads being transfered into the caliper or from loosening the pin. Anybody else? Come on Stan. Surely you have some input on this. Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted May 13, 2008 Share Posted May 13, 2008 So transparent am I ? I don't use those brakes... Its to keep dirt out of the threads...Maybe/??? Quote Link to comment Share on other sites More sharing options...
pcinpdx Posted May 13, 2008 Share Posted May 13, 2008 I noticed the same when I changed my brakes this weekend. Since the dealership didn't have them in stock, I put everything back together without them. I've ordered the new ones. For my '02 the description and part number are: O-RING (2.5X1.5) 45111-MAJ-G41 Cost is $2.73 per ring. I figure it's just as well to spend <$10 for something to do with my brakes. I don't care how mundane the part is. Quote Link to comment Share on other sites More sharing options...
ironmike Posted May 13, 2008 Share Posted May 13, 2008 The GL1800 has the same o-ring (damn near identical brakes, too). As I understand it, the o-ring in the end of the pin has several purposes, but primarily to center the pin in the inner caliper housing and to isolate the pin from vibrations generated or manifest from that side of the caliper. FWIW, I never knew there even was any vibration to speak of, but an engineer explained that there were several types; normal unsprung road undulations, primary and secondary engine vibrations transmitted through the frame/drive train, and brake pad vibrations (both loose and when applied). The last thing he mentioned was that all disc brake calipers have a small, yet inherent, degree of flex when hydraulic pressure is applied. If the pin didn't have the o-ring to compensate, it would have to flex or bow - that could potentially mitigate the effectiveness of the pad/rotor interface, and manifest itself by an audible high frequency sound (brake squeal). Of course, he acknowledged that there can be other causes of squeal as well... I guess I learned something... I've made sure to reinstall the o-ring. BTW, you can buy assortments of multiple sizes of o-rings at places like Harbor Freight (about ten bucks for several hundred) - that's where I found perfect replacement o-rings. Quote Link to comment Share on other sites More sharing options...
Para045 Posted May 16, 2008 Share Posted May 16, 2008 the other day when i was changing my brake and clutch fluid i took out my brake pads to check them. when i took the bolt/pin out to check the pads, the small 0 ring on the end was shot (it was elongated). what purpose does it serve? Spare cock ring for Dave Quote Link to comment Share on other sites More sharing options...
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