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[Brikhead]

p.s. I do this sort of stuff for a living 

I'll bow to your superior knowledge then, to be honest I've probably picked up my information from either the Haynes book of lies, or possibly, the instructions that come with the 'Eazi-Bleed' pressure bleeding systems...

I have always bled brakes starting with the calliper furthest from the master cylinder (usually passenger rear) and then doing the opposite side on the front...

[Kevin Wood]

...
looking at the Omega, most cars have a master cylinder with two different bore sizes, 25 and 20mm. The 25mm part feeds both front wheels, whilst the 20mm part feeds both rear wheels.
...

Hmm. I'd never realised the two circuits had different master cylinder bore diameters. You learn something every day.

Kevin

[Broomies Mate]

I'll hold my hands up and thank Woody for teaching me something which, I guess, we should all have basic knowledge of.

As mentioned earlier, I too bleed brakes 'furthest' then the opposite, etc etc.  I've been doing it wrong 

Oh well, you live and learn!

So, back to my problem...... I'll get the alignment checked, and see what goes!

[Andy B]

....

As mentioned earlier, I too bleed brakes 'furthest' then the opposite, etc etc.  I've been doing it wrong  ......

Mr Haynes gives two different techniques depending on the age of the car

[Mr Skrunts]

I'll hold my hands up and thank Woody for teaching me something which, I guess, we should all have basic knowledge of.

As mentioned earlier, I too bleed brakes 'furthest' then the opposite, etc etc.  I've been doing it wrong 

Oh well, you live and learn!

So, back to my problem...... I'll get the alignment checked, and see what goes!

Why spend money on the alighnment

You need need to sort your brakes out 1st.  Fluid may pass though all the pipes when bleeding, but you dont bleed brakes at the operatinh pressure when running.  You said a load of crap came out of the pipes.

Check for damaged/corroded pipes, look for crushed pipes where you can.

Rebleed the system.

Take it to an MOT station and ask them yo check it on the rollers, you could simply be losing all your power in an ecpanding flexi pipr to the wheels under hard braking.

[2woody]

actually, the best way to bleed is to do the lowest circuit first. Not easy, as it involves examining the car and working out which are the highest brake lines.

reason being - if there's any residual air in the system, it'll rise to the highest part, allowing you do bleed that last of all.

[2woody]

...
looking at the Omega, most cars have a master cylinder with two different bore sizes, 25 and 20mm. The 25mm part feeds both front wheels, whilst the 20mm part feeds both rear wheels.
...

Hmm. I'd never realised the two circuits had different master cylinder bore diameters. You learn something every day.

Kevin

I think yours will have equal 25mm brake master cylinder. As far as I can tell, they changed sometime after facelift, but before 2.6/3.2.

the size is cast into the body of the master cylinder on the top, below the reservoir.

there's also names on the BAS block for the circuits, but they're in German. HR, for example is Hinten (rear) rechts (right).

just looked it up from Bosch - HR = hinten rechts (rear right), HL = hinten links (rear left), VR = vier rechts (front right) and VL = vier links (front left)

mind you, if there's any German speakers on here, I'll be embarrased, 'cos the German above is a complete guess.

[Kevin Wood]

Sounds about right. Vor = before, Vorderseite = front
Hinter = behind. 

I wonder if they changed when the vented rear disks came in? Just a thought. Rear caliper might have changed piston diameter then.

Worth bearing in mind that the MCs are not interchangeable without affecting the brake balance.

Kevin

[Sixstring]

...
looking at the Omega, most cars have a master cylinder with two different bore sizes, 25 and 20mm. The 25mm part feeds both front wheels, whilst the 20mm part feeds both rear wheels.
...

Hmm. I'd never realised the two circuits had different master cylinder bore diameters. You learn something every day.

Kevin

I think yours will have equal 25mm brake master cylinder. As far as I can tell, they changed sometime after facelift, but before 2.6/3.2.

the size is cast into the body of the master cylinder on the top, below the reservoir.

there's also names on the BAS block for the circuits, but they're in German. HR, for example is Hinten (rear) rechts (right).

just looked it up from Bosch - HR = hinten rechts (rear right), HL = hinten links (rear left), VR = vier rechts (front right) and VL = vier links (front left)

mind you, if there's any German speakers on here, I'll be embarrased, 'cos the German above is a complete guess.

Sehr gut, mein herr!!

if that was a guess, it was a good one.

Du ist nicht ein dummkopf!!

[2woody]

Yes, the rear piston size changed when vented was introduced.

My "best guess" would be that the 25-25 master cylinder was introduced at the same time as EBD ( electronic brake force distribution )

maybe a rough survey required.