If you need to rebuild the Nissin caliper you can't - its disposable

A Brembo Goldline caliper is available from Biketorque racing (www.biketorqueracing.co.uk) part number 20516143 which is cheaper than the OEM part, comes with pads, is rebuildable and a direct fit (required a 2mm washer between caliper and frame mount to line up with disc centreline) - was cheaper too and was delivered in 24 hours from date of order.

The brake hose routing is now less than ideal but I have plenty of Goodridge hoses etc to sort this out.

My order through my local HD dealer for a Nissin caliper is expectde to take at least three weeks - says it all.

What was wrong with the old caliper? .........specialist companys can soon make the seals if that was the only problem.

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

old caliper had repeated piston siezure and cannot be rebuilt - therefore it goes in the bin since I am quite capable of rebuilding calipers from rebuild kits.

Have a look at how the Nissin is assembled.

Is it a problem caused by corrosion from the exhaust gas?

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08 Specialized Langster

Got the impression from the first post though that rebuild kits weren't available hence why it had to be scrapped

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

exhaust gas has never been near the caliper, as soon as I took delivery of the bike the standard can was dumped for to prevent the possibility of exhaust crap over the caliper, I had seen this when riding one of the first 1125R in the country whilst helping to run in a dealer demo bike

Kevmean, one of the pistons began to become lazy in its operation, I thought I had cured it with brake cleaning spray but the problem reappeared soon thereafter

I am looking at the Nissin Rear caliper on My X1 it isn't going to pass MOT this year without attention. So I have it in bits at the moment.

The piston came out with pliers but is very stiff. Warrs can get me a rebuild kit but in September ( one month away) Part number H0020,FA (googled that number and its the front! that'd be a bastard having waited for it.
The piston measures 34 mm diameter and is 31 mm long.
Motorcycleproducts.co.uk have a repair kit with no branding which includes the two seals and new piston for £21.30.
The piston is only slightly damaged on the extreme edge so maybe I only need new seals.
powerhouse do seals only for 'Suzuki/kawasaki 34mm nissin pistons for only £6.

Does anyone know any better which route to take.

If it was me, I would replace piston and seals. I'd spends time with a dremel and brass chimney brush in the seal recesses and then grease the seals and recesses with Castrol red grease then assemble. The pins that the caliper floats on should be shiny and greased too with the dust seals in good condition.

Experience shows that Buell stuff is normally as cheap or cheaper than other manufacturers using the same part and I wouldn't skimp by buying pattern stuff cos you may not be happy with the result...

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08 Specialized Langster

I recon it is H0030.F which will be under £15. Not sure what is in it though...

However, on the XB range, which I am pretty sure is the same caliper (I would need to check but BlueBird will know off the top of his head) has a repair kit listed as H0030.T 'PISTON SET, rear master cylinder' which is slightly cheaper.

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08 Specialized Langster

XB piston is 34 OD x 31 long
Dust seal 34 ID x 2.1 thk x 2.0 deep
Oil seal 34 ID x 3 thk x 3.3 deep

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08 Specialized Langster