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[Andy A]

Very last question.

Is it best to renew all the bleed nipples and what size thread etc are they or is it best to buy from Vauxhall?

Thanks

[Andy B]

Bleed nipples are a couple of quid each. If you're buying one, it kinda makes sense to replace all of them. When I painted all my calipers I used a standard M8 bolt to keep the threads clear, but others have said theirs used something else 

[sjc]

Haynes manual says...

Pre-1998 3-channel ABS: bleed front left ; front right ; rear left ; rear right

Post-1998 4-channel ABS: bleed left rear ; right front ; right rear ; left front

 

[Andy A]

Thank you all for your help and advice. 

[Doctor Gollum]

Very last question.

Is it best to renew all the bleed nipples and what size thread etc are they or is it best to buy from Vauxhall?

Thanks

Have you not done it yet?

Never needed to replace a bleed nipple on an omega yet. Although there's always a first time obvioisly. Look at the nipples and visually check they look ok. Rubber caps present, no vast amounts of rust or corrosion. If looking normal.... Just bleed the brakes.

Most important thing is to insure the reservoir is topped up/doesn't draw air in as you draw the fluid through at the caliper.

[Doctor Gollum]

Haynes manual says...

Pre-1998 3-channel ABS: bleed front left ; front right ; rear left ; rear right

Post-1998 4-channel ABS: bleed left rear ; right front ; right rear ; left front

 

[Andy A]

Very last question.

Is it best to renew all the bleed nipples and what size thread etc are they or is it best to buy from Vauxhall?

Thanks

Have you not done it yet?

Never needed to replace a bleed nipple on an omega yet. Although there's always a first time obvioisly. Look at the nipples and visually check they look ok. Rubber caps present, no vast amounts of rust or corrosion. If looking normal.... Just bleed the brakes.

Most important thing is to insure the reservoir is topped up/doesn't draw air in as you draw the fluid through at the caliper.

Will do Doc. 

Thanks

[Diamond Black Geezer]

Thing is with bleed nipples is they sit there being attacked by salt, road grime, stones etc... and get undone very rarely. They either turn ok, or get stuck and shear part way in the caliper. Mine were a little rounded, but were 'ok' this time, but after another layer of steel corroded off after however many years, the next time they were due for being undone I could imagine it would be mole grips time, so I've replaced mine. I'd say it's an 'each to their own' thing.   

Again, the crucial thing here is not to allow air to be drawn in, as stated, the condition of the nipples is secondary. I've only replaced mine as now's the time to replace them, as the caliper's currently off the car - you can't exactly just change them one day on a whim, not without having to bleed the system again. 

[Andy A]

Thing is with bleed nipples is they sit there being attacked by salt, road grime, stones etc... and get undone very rarely. They either turn ok, or get stuck and shear part way in the caliper. Mine were a little rounded, but were 'ok' this time, but after another layer of steel corroded off after however many years, the next time they were due for being undone I could imagine it would be mole grips time, so I've replaced mine. I'd say it's an 'each to their own' thing.   

Again, the crucial thing here is not to allow air to be drawn in, as stated, the condition of the nipples is secondary. I've only replaced mine as now's the time to replace them, as the caliper's currently off the car - you can't exactly just change them one day on a whim, not without having to bleed the system again. 

I've had a nasty cold ever since so unable to do them yet. Did you get your bleed nipples from Vauxhall and what was the price?

[Diamond Black Geezer]

Ah no, mine were from a mint scrapper, actually. But with clean, sharp edges, no sign of them every being undone before, so worth pocketing when I saw them 

As per a post by the good Mr Marks DTM, from several years ago...

Fronts - M8 x 1.25
Rears - M8 x 1.00

So eg:
http://www.ebay.co.uk/itm/Brake-Caliper-Bleed-Screw-Nipple-M8-x-1-00mm-part-number-BPN22-/261691573516?pt=UK_Motorcycle_Parts_13&hash=item3cee08850c

and...
http://www.ebay.co.uk/itm/Brake-Caliper-Bleed-Screw-Nipple-M8-x-1-25mm-/181570539746?pt=UK_Motorcycle_Parts_13&hash=item2a467290e2

as you can see, cost is minimal as you'd expect, you can even get stainless steel ones. for about the same price.

[Andy A]

Ah no, mine were from a mint scrapper, actually. But with clean, sharp edges, no sign of them every being undone before, so worth pocketing when I saw them 

As per a post by the good Mr Marks DTM, from several years ago...

Fronts - M8 x 1.25
Rears - M8 x 1.00

So eg:
http://www.ebay.co.uk/itm/Brake-Caliper-Bleed-Screw-Nipple-M8-x-1-00mm-part-number-BPN22-/261691573516?pt=UK_Motorcycle_Parts_13&hash=item3cee08850c

and...
http://www.ebay.co.uk/itm/Brake-Caliper-Bleed-Screw-Nipple-M8-x-1-25mm-/181570539746?pt=UK_Motorcycle_Parts_13&hash=item2a467290e2

as you can see, cost is minimal as you'd expect, you can even get stainless steel ones. for about the same price.

Thanks for the links and info. 

[omega2018]

I have this tasked planned but wasn't going to replace the nipples.  doing it with a gunson easi bleed tyre pressure type bleeder, if i fully remove the nipples aren't i going to get a flood of brake fluid?  or do you bleed, disconnect the tyre, remove and replace the nipple, reconnect the tyre, bleed again and tighten?  seems like a faff and a bit of a wet mess.

[omega2018]

this place seem to be the cheapest £2.50 a pair inc del and they include new caps - http://stores.ebay.co.uk/biggredltd/ 

beware, they call them screws not nipples so they don't appear in a search for 'bleed nipples'

next question, does anyone know the total overall length?  I know a long one will always fit but i'd like to get them right and not have to take the  old ones out before ordering.

options are (head size in brackets):

M8 1.25  24.5mm (8mm), 32.5mm (9mm) , 34.7mm (8mm), 35.5mm (9mm), 41.5mm (9mm), 49mm (9mm),

M8 1.0  28mm (8mm), 32mm (8mm), 33.5mm (9mm), 38mm (8mm)

[Andy A]

I have this tasked planned but wasn't going to replace the nipples.  doing it with a gunson easi bleed tyre pressure type bleeder, if i fully remove the nipples aren't i going to get a flood of brake fluid?  or do you bleed, disconnect the tyre, remove and replace the nipple, reconnect the tyre, bleed again and tighten?  seems like a faff and a bit of a wet mess.

Yes. I have ordered a set of these http://www.amazon.co.uk/dp/B000R9ZIUQ/ref=sr_ph?ie=UTF8&qid=1425634856&sr=1&keywords=Sealey-Hose-Pinch-Tool to clamp the rubber brake pipe before each caliper. To stop the fluid escaping. 

[Andy A]

this place seem to be the cheapest £2.50 a pair inc del and they include new caps - http://stores.ebay.co.uk/biggredltd/ 

beware, they call them screws not nipples so they don't appear in a search for 'bleed nipples'

next question, does anyone know the total overall length?  I know a long one will always fit but i'd like to get them right and not have to take the  old ones out before ordering.

options are (head size in brackets):

M8 1.25  24.5mm (8mm), 32.5mm (9mm) , 34.7mm (8mm), 35.5mm (9mm), 41.5mm (9mm), 49mm (9mm),

M8 1.0  28mm (8mm), 32mm (8mm), 33.5mm (9mm), 38mm (8mm)

Good question.

Any one know what diameter plastic tube I need to buy to fit over all 4 nipples to get a nice air tight seal?