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Brake Caliper Seal question

Joe Nardy

Joe Nardy

Forum Sage
Past Site Supporter
TGSR Superstar
I know this has been covered here before but I couldn't find the information. I'm going to rebuild my front calipers on the GS1100 and have a question regarding the seal orientation. The piston seal is not flat on the inner edge, it is angled. I can't remember what the orientation should be. I think it should be oriented with the shorter end toward the brake rotor so it helps hold the piston near the rotor so there's no wasted lever travel moving the pads against the rotor.

Is this correct? Please inform......

Thanks,
Joe
 
chuck hahn said:
When you remove one, look to see how its oriented Replace the same way.
Click to expand...

Chuck,

That's the issue. I replaced them a few years ago and I think I installed them backwards........:o

I believe the way it works is that the rotors push the pads and pistons away from the rotors when the brake pressure is released. If the piston seals are oriented incorrectly they will pull the piston further away from the rotor and additional lever travel is required to push the pads back against the rotors. If they are correctly oriented they will push the pads lightly against the rotors so the lever is firmer and needs less travel.

Thoughts?
 
Angled? You sure? No mention of that in the service manual.
 
Nessism said:
Angled? You sure? No mention of that in the service manual.
Click to expand...

Ed,

Yes, I'm sure. I also checked the manual when I rebuilt them and found no mention of it either. I've been doing some searching and have found a couple other mentions of an angled seal. Here's one from an EX500 forum. It doesn't have a definite answer but it seems the angle is there to help pull the piston and pads AWAY from the rotor. I have also found a lot of info mentioning that the caliper seal groove is angled at the bottom. See this article and diagram.

seals.gif


From this diagram it appears the angles edge of the seal should be down and the flat edge up. It's hard to tell from the diagram but it looks like the short edge of the seal should go away from the rotor? I guess it would be easy enough to determine by measuring the depth of the groove.

Thanks,
Joe
 
Last edited:
Here's another thread about his form a TL Forum. It shows the below pic very clearly showing the angle. I would assume the angle would match the angle of the groove in the caliper??

P1010189.jpg


Thanks,
Joe
 
Last edited:
Here's another thread about his from a TL Forum. It shows the below pic very clearly showing the angle.

P1010189.jpg


Thanks,
Joe
 
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