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[P6UL K]

I have!

All 4 calipers and their flexi hoses are dry as a bone with no sign of any fluids inside the rims or on the ground.  AFAIK there aren't any other rubber brake hoses are there?

It doesn't have to be a flexy hose that's failed,steel pipes can and do corrode and burst

TBH I'm not sure anything has burst as there is still 'very' minimal braking at about 5% 

[05omegav6]

Is this the diesel one or the 3.2

The thorn in my side mate - the hearse.

Right, so manual 2.2dti, should have solid rears, but if they've been upgraded at some point, the calipers will be marked with 42, same as the 3.2

[P6UL K]

Why would that be of any relevance chap?

[05omegav6]

Why would that be of any relevance chap?

Solid discs in vented calipers allows the pistons to escape, causing fluid loss, hence Marks post

You're already having vacuum issues with that car, so master cylinder/servo looking likely... and being a diesel, the cause/solution may be different to the V6.

As said, the clutch is fed by the brake reservoir, so fluid loss would soon stop you changing gear, again, if the clutch works, it points to a vacuum/servo problem...

[Nick W]

Sudden fluid loss with no obvious  external leak is classic master-cylinder failure.
The brake fluid has leaked into the servo, which is why you can't see it.

Yet.

Eventually, it will drip down the brake pedal and onto the carpet, so that's probably worth a look.

[P6UL K]

Why would that be of any relevance chap?

Solid discs in vented calipers allows the pistons to escape, causing fluid loss, hence Marks post

You're already having vacuum issues with that car, so master cylinder/servo looking likely... and being a diesel, the cause/solution may be different to the V6.

As said, the clutch is fed by the brake reservoir, so fluid loss would soon stop you changing gear, again, if the clutch works, it points to a vacuum/servo problem...

I'll check that out tomorrow but I doubt anyone would bother with that kinda upgrade on this Omega 

[P6UL K]

Sudden fluid loss with no obvious  external leak is classic master-cylinder failure.
The brake fluid has leaked into the servo, which is why you can't see it.

Yet.

Eventually, it will drip down the brake pedal and onto the carpet, so that's probably worth a look.

This is what I suspect and have been advised, can I just replace the master cylinder or do I need to replace the servo also? I'm guessing I can't leave it with brake fluid in it...? :-/

[Nick W]

You're unlikely to need to replace the servo, just remove all the brakefluid from it. A large syringe works well, or you could soak it up with lots of rag/tissue.

[P6UL K]

You're unlikely to need to replace the servo, just remove all the brakefluid from it. A large syringe works well, or you could soak it up with lots of rag/tissue.

Good stuff, I'll get onto Vauxhalls in the morning then! Hopefully this will sort my boost issues too but I doubt it 

[Andy B]

....
Good stuff, I'll get onto Vauxhalls in the morning then! Hopefully this will sort my boost issues too but I doubt it 

I'd expect the price of A N Other master cylinder to be favourable than that of the main dealers 

[P6UL K]

That's a fair point Andy and one which I will look into but I have trade card so no doubt will save me a fair bit 

[Andy B]

That's a fair point Andy and one which I will look into but I have trade card so no doubt will save me a fair bit 

Trade Club Card is mainly for service items, you might get it at 'Trade' if you're lucky.

An OOF breaker might be your best bet. 

[Nick W]

A secondhand brake mastercylinder?

Count me out.

[P6UL K]

Nah I'll buy new, get good discount on most things from Vx with the trade card, failing that I get trade at a few motor factors. And Halfords 

[Andy B]

A secondhand brake mastercylinder?

Count me out.

Come off it ...... do you need a hand down from your high horse?  ? It comes under the same heading as part worns when you buy your 'new' car ..... we don't change all four tyres (Chris might  ) What's the problem?