HELP! All brakes locked on!

[billabong]

Yesterday I upgraded the brakes on my 1.9D Mk3 golf to GTI brakes.
I used the GTI wishbones, hubs,driveshafts, carriers, calipers, discs and pads. I also put the GTI master cylinder on.
I did a full bleed and tested, all seemed OK but the pedal was a bit hard.
This morning driving to work, after about 10 miles, all the brakes seized on and now the car is at a standstill and will not move at all!
This doesnt make any sense? :/ Any ideas please??

[Bellend]

Master cylinder damaged in some way or incorrectly fitted if it's definitely all brakes.

[billabong]

Thanks.
What MC should I be using? The GTI one was a car with ABS, will that make a difference?
The original MC was a 20 and the GTI was a 23 I think...
Thanks

[Bellend]

I don't think it would tbh but you can use your old MC no problems, I used my old one which I think was 20 or 19 IIRC when I upgraded and brakes were good and sharp and never had any issues.

[billabong]

Ah ok, Maybe I will put the old one back on and do a full bleed and see how that goes...
I had to bend the pipes to get it to fit the 23 so hopefully they will bend back ok!

[Bellend]

Ah.

How badly bent are they? Not kinked in any way?

Leave the car a while, I wonder if the brakes will release?

Could well be the pipes kinked and you've forced fluid through with help of a servo and it doesn't quite have the pressure to release the other way.

Check the pipes.

[billabong]

Pretty sure none kinked but can check. Going to try again soon to see if it has unstuck. If not I'll get the AA to run me home :/