Piston Cup Set

[wan3417]

How important is the rubber covering at the lever end of the front master cylinder assmby?
I'll be replacing the piston cup assmbly and am missing this part. thanks for input guys.

[ILoveThumpers]

Without that boot, when you depress the piston (by squeezing the lever) you're exposing a portion of the cylinder bore to the elements. Over time, moisture will make its way in there.

Another risk is something jamming itself between the piston end stop and the circlip that holds the whole mess in. In that case the piston can't fully retract, preventing the seal from resting in the right place.

If you can get your hands on one, you should definitely replace it.

-Deek

[eil]

Moisture yes, but moreso dirt and sand which will scratch the bore and tear up the seals. Get a new one, they're not that expensive.

[wan3417]

Thanks guys. Will get replacement set asap.
BTW they don't sell them seperately do they?

[eil]

Did you buy a new OEM piston and cup assembly? If so, it should have come with one and you can badger the dealer about it.

You might have some luck on eBay or in the parts wanted forum if that's the only bit you need.

[wan3417]

Thks Charles. It did come with the kit I bought but somehow got misplaced.