Which way round?

ROZZER · #1 PostAuthor: **ROZZER** » Wed Oct 24, 2007 6:04 pm

Stripped brake caliper on my Z1B for powder coating (piston seal leaking has stripped paint). Which way round does the new piston seal go, it appears to have a taper on the I/D to seal against the piston which I think lip should face the piston, but taking old one out it had lip facing pad side?

#2 PostAuthor: **Jerry** » Thu Oct 25, 2007 9:39 am

I'm fairly sure that despite the look of the seal, they are made parallel. The movement of the piston against the seal when you apply the brake "tilts" the seal to hold the pressure. I've just done my caliper and I know where you're coming from - my new seal seemed to be a bit biased to one side, so I fitted what looked to be the smaller diameter side facing inwards (towards the fluid) as you would fit a lip-type oil seal.
The little O rings fit in the two centre grooves of the slide bolts.

ROZZER · #3 PostAuthor: **ROZZER** » Thu Oct 25, 2007 10:27 am

Thanks Jerry, havn't got new seal yet but will check it when it arrives and fit as you suggest.

Pigford · #4 PostAuthor: **Pigford** » Thu Oct 25, 2007 6:13 pm

Sorry to break up the party, but surely, I'd be tempted to fit the wedge, tighter bit againts piston, on fluid side

Hard to describe, but if it was a door wedge, the bit stuck under the door would be exposed to the air. :shock:

Unless thats wot u meant :wink:

#5 PostAuthor: **Jerry** » Fri Oct 26, 2007 9:49 pm

You Wally!! That's what I just said!

Rich · #6 PostAuthor: **Rich** » Sat Oct 27, 2007 2:38 pm

You have to excuse him! He gets a little confused when you use big words like diameter :roll:

#7 PostAuthor: **Jerry** » Sat Oct 27, 2007 4:12 pm

I was going to suggest just leaving the caliper off, but thought that might sound a little harsh!

DogsbolloxofZ1B · #8 PostAuthor: **DogsbolloxofZ1B** » Sat Oct 27, 2007 5:20 pm

That's Ok,the rear brake is better than the front anyway

Pigford · #9 PostAuthor: **Pigford** » Sat Oct 27, 2007 5:22 pm

OK lads, I've got the message :evil:

It's back to the drawing board (or is it ironing board) for me :cry:

ROZZER · #10 PostAuthor: **ROZZER** » Sat Oct 27, 2007 5:23 pm

A reply worthy of our Mr Doran Jerry- LOL.
Ordered seal from Z power and Dave Marsden reckons they are parallel so don't matter which way round it goes. Pigfrod, I think you are saying the opposite to Jerry i.e larger dia on piston side is that true or am I picking it up wrong?

Pigford · #11 PostAuthor: **Pigford** » Sat Oct 27, 2007 6:21 pm

Just taken the old seal of my caliper, and it does seem to be angled :?:

The new one also seems to have a slight angle on the inner face :shock:

Common sense would dictate that the thicker edge needs to be nearest the hydraulic fluid, if there is actually an angle :??

Rich · #12 PostAuthor: **Rich** » Sun Oct 28, 2007 9:30 am

The main thing to remember John is to clean out the groove the seal sits in, if there is a build up of crud in there it will stop the piston returning properly.

Which way round?

Which way round?

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