Caliper seals (tokico 6 pot)

[killa]

I’ve recently had my pads changed on the ZX7R.
The calliper on the back was fucked to put it bluntly. I spend an afternoon refurbishing them, replaced the seals and it’s working good now.

The front is a different story but I’m not sure why.
I think last time this year i had the seals changed, but now my front brake is dragging slightly. I may need to take a look at them over the weekend. My questions is, really i don’t think the seals should be buggered, if i take them apart for a bit of a clean, am i going to be looking at another set of seals. Or could i get away with using the existing??
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Cleverly disguised as a responsible adult.
Bike:- Yamaha TRX850 | Killas Biking History | Killas Gaming History | Killas autmotive history

[Kickstart]

Hi

I would doubt the seals are wrecked, but it is possible (and probably more likely the longer your leave it).

Might be worth wiping the calipers off and checking for any dust seals bulging out just so you can (if required) order some in advance.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Pete.]

As Keith said, the seals should be ok. One thing that many people neglect is the seal grooves. These commonly have a crusty layer of corrosion right in the bottom of the groove which needs to be carefully scraped out to allow the seal to sit low enough. If you don't do it the seal might be pushed quite tight onto the piston.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[killa]

Thanks Pete.
With the rear i stripped the whole thing and not only scrapped and cleaned all the crap out i steam cleaned the barrels. Seemed to work well.

Am i right in saying the only way you’d be getting a bit of drag on the brakes is the calliper themselves, not the master cylinder?
____________________
Cleverly disguised as a responsible adult.
Bike:- Yamaha TRX850 | Killas Biking History | Killas Gaming History | Killas autmotive history

[Kickstart]

Hi

Generally yes. The m/c can cause it but it would likely need to be very gummed up. Possibly very old fluid (and I mean decades old) could block the holes in the banjo bolt. Lever can stick. Some levers can be adjusted so that they will preload the piston. The spring in the m/c could have snapped.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing