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[philiggy]

I think I may need a brake master cylinder for my car but non of my local motor factors stock it and its £175 fom the dealer.

Does anyone know of anywhere I could try for one :-?

Phil

[Andy B]

I think I may need a brake master cylinder for my car but non of my local motor factors stock it and its £175 fom the dealer.

Does anyone know of anywhere I could try for one :-?

Phil

What makes you think that?
There's always various cars being broken here ..... I've no idea whether a 2.0's is the same as a 2.2's or a 3.0's etc

[philiggy]

The brakes pump up, the last 2 cars that have done this it was because the master cylinder seals had been flipped when the brake pads were changed
I'm not sure if they are all the same, just that no motor factors listed them, not sure I'd want to use 2nd hand brake parts tho

Phil

[Andy B]

..... just that no motor factors listed them, not sure I'd want to use 2nd hand brake parts tho

Phil

Looks like you might be parting with £175!  
Are you sure they don't need a good bleeding? I can pump mine up very slightly, but I've found in the past that bleeding them has sharpened up the pedal.  

[philiggy]

..... just that no motor factors listed them, not sure I'd want to use 2nd hand brake parts tho

Phil

Looks like you might be parting with £175!  
Are you sure they don't need a good bleeding? I can pump mine up very slightly, but I've found in the past that bleeding them has sharpened up the pedal.  

Thanks I'll try that first see if it helps, if not at £175 I might be thinking 2nd hand

Phil

[Andy B]

.....

Thanks I'll try that first see if it helps, if not at £175 I might be thinking 2nd hand

Phil

Be carefull if you do replace it. I believe it can be very difficult to get air out of the ABS modulator, especially without a TechII to manually operate the pump.

[Seth]

The brakes pump up, the last 2 cars that have done this it was because the master cylinder seals had been flipped when the brake pads were changed
I'm not sure if they are all the same, just that no motor factors listed them, not sure I'd want to use 2nd hand brake parts tho

Phil

Never heard of the seals flipping on Omegas, though I do know it's common on Astras and Vectras.

Are you getting bubbles in the reservoir when you pump the brake pedal? The seals are certainly shot if this happens. Get an assistant to pump the pedal and take a look at the fluid.

Other than this, give it a damn good bleeding before shelling-out the dosh.

[feeutfo]

if by pumping up you mean, standing hard on the pedal repeatedly then getting a firmer feel, both my migs have done that, as have a couple of other cars and bikes with original equipment. Only my brembo master cylinder on my track bike does not do it, that ive noticed, anyway.

I always put it down to mass produced machine tolerances allowing fluid to blow by the piston in the m. cylinder.(if thats how a cars works) So i wonder if a new item will be any different?

If there is a cure for it i would be interested but i fancy an aftermarket item from the likes of ap or brembo will be the only answer. And that i presume will be alot more than 175 sobs.

But one question, do you notice any differenc before and after pumping the pedal when actually braking when driveing the car? Cant say  i noticed but i will try it today and see.   :-?

[philiggy]

Yes, the pedal travels down farther than it should because it compresses the air first, giving it a couple of sharp dabs works and the pedal comes up, as it then works on the fluid only.

The more common cause is the master cylinder seals have been flipped by over enthusiastic forcing back of caliper pistons when changing brake pads.

I think Hydraulic systems either work properly or not , and there is no middle ground, if the brakes pump up at all I think you have a potentialy dangerous fault.

Phil

[TheBoy]

I've seen - an experienced - this when air is in system, be it ABS modulator, or down at a wheel cylinder/piston (in my case).

Tech2 unit can normally quickly identify if it is in line from ABS to caliper, and which wheel its on.  It can also help get air from ABS modulator.


I would be inclined to do a full flush and bleed (£2.50 worth of fluid) before committing £175.......