Caliper seals

The manual is a little vague: " In addition, the seal and seal groove are different in section so that when bedded, the seal feels proud to the touch at the edge furthest from the bore."

...?

"... furthest from the bore".

WTF

I'm thinking that the "proud" edge should be closest to the hydraulic pressure, thereby increasing the fluid seal when hydraulic pressure is applied. That is, the O-ring should stick out a bit toward the outside of the caliper. The opposite site orientation would allow pressure/fluid to seep past? So which way does the o ring go into the caliper? High edge in board or out?

(Jolly ole Brits and their what'en-tots and fah fah balder-crap, eh wot!?)

BC

It's written a little funny but it makes sense.

Furthest from the bore means furthest from the opening.

Put the seal in, the back edge of the seal should stick up slightly more than the front.

Does that help?

Just to clarify: its not an o-ring, its a square. With one side outside diameter larger then the other. I think the greater size OD sits toward the outside of the caliper.

I'm also thinking the english language doesn't really fulfill motorbike mechanics.

BC

Stillreel said:

The manual is a little vague: " In addition, the seal and seal groove are different in section so that when bedded, the seal feels proud to the touch at the edge furthest from the bore."

...?

"... furthest from the bore".

WTF

I'm thinking that the "proud" edge should be closest to the hydraulic pressure, thereby increasing the fluid seal when hydraulic pressure is applied. That is, the O-ring should stick out a bit toward the outside of the caliper. The opposite site orientation would allow pressure/fluid to seep past? So which way does the o ring go into the caliper? High edge in board or out?

Click to expand...

It isn't clear because the instructions were not written out correctly in the manual.

The Lockheed service instructions contain a slightly different version:

The fluid seal groove and the seal are not the same in section, thus when bedded the seal feels proud to the touch at the edge furthest away from the mouth of the bore.

Click to expand...

Stillreel said:

.. I think the greater size OD sits toward the outside of the caliper..

Click to expand...

Don't worry ,someone else did all the thinking for you ..

Suppose you where a brake manufacturer , what would be better :
1. cut the bottom of the groove at an angle and use cheap , straight cut seals , or :
2. use expensive tapered seals , with the risk that a candidate for the Darwin Awards installs them backwards ?

I see a Harley in your future

The Lockheed manual confirms my thoughts. Thanks LAB. This is all new to me but a great learning experience. Great post Ludwig (moron).