Before embarking on bleeding my brakes, I want to get some new bleed nipples. I couldn’t bleed the brakes yesterday as it could have been too risky looking at the state of the rear ones.
I’ve bought two new rear calipers off eBay (£108.50 delivered for the pair, cheaper than reconditioning!) and I’m considering reconditioning the front ones, but haven’t decided yet (I think the seal kit comes with new bleed nipples, but I might just get one as a spare just in case.)
There are loads on eBay, but I’m not sure of the screw pitch etc.
So does anyone know the size?
Cheers.
metric thread 8mm. diameter, 1.25mm. pitch, I do not know what price you have been quoted, I got mine from Vehicle Wiring Products, www.vehicleproducts.co.uk Ref B671. £0.75 each.
Regards Geoff Peace.
Cheers Geoff 
Front and rear aren’t the same. As I recall, fronts are 8mm thread but rears (and clutch slave) are 7mm.
Hmmm, I’m confused now. I think I might just buy the recon kits for the fronts and be done with it.
The parts book shows them as different
Front=33-691 [B001-33691]
Rear=33-691A [BWOH-26-691]
I’ve just looked at the Autolink page and it doesn’t look like the bleed nipples are part of the kit.
Cack, it looks like they only come with the rear kit
Definitely different sized front and rear on my stock 1.6. Also my front ones were rusted up so that the bleed holes were blocked as the dust caps weren’t fitted. I had to take the nipples out and re-drill them (while fluid dribbled out of the back of the caliper - great fun)
So is this for sure, just before I buy some. Would that make them 7mm x 1.00mm pitch for the fronts on a 1.6?
I’m sure we used a 8mm spanner on the slave cylinder last Saturday, does the head size have nothing to do with the thread?
I have my eyes on these stainless ones on ebay for £2 each posted.
I looked at speedbleeder.com to remind myself what I bought, years ago:
It says the fronts on a Mk.1 are 8mm x 1.0mm and the rears are 7mm x 1.0mm. That sounds right to me. Doesn’t say what the clutch slave needs. I know it’s the same as one or other of the brakes, and I’m pretty sure it’s the rears, though I’m not 100% on that. (I remember discussing it at the time, but that was on either the predecessor to the predecessor of this forum or the predecessor to the email list. Gone now, either way.
By the way, the spanner size isn’t definitive (for example my speedbleeders, being American, are machined from non-metric hexagonal stock, so they actually need a non-metric spanner for a perfect fit). Then again, if you were using an 8mm spanner on the hexagonal section of the clutch bleeder, than presumably the threaded section would have been slightly thinner. That would tend to support the idea it’s 7mm.
Cheers, that means the ones on that eBay link are no good as the pitch is 1.25mm on those 
I’ll pop into the local motor factors and see what they have.