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[Enceladus]

Have you removed the leaking caliper? Seals for 42mm are available, so if the bores aren't scratched and the pistons are undamaged it should be possible to overhaul your unit.

You might even be able to get seals at a local motor factors as 42mm ATE are used on numerous Mercs and other makes. The seals for the piston are the same albeit the caliper might be different. The GM Vauxhall seal kit part # is 9095057 but I doubt if they are available. Maybe on a special order from Germany.

[tango]

Could i be lucky and push the pistons back in
Fit new vented discs and good to go
Or is the calliper damaged and seals have to be changed

[Enceladus]

Could i be lucky and push the pistons back in
Fit new vented discs and good to go
Or is the calliper damaged and seals have to be changed

I don't know, but I suppose you could be lucky, if you are careful about how you retract the pistons. They only real way to tell is to remove the caliper, push out the pistons carefully with compressed air and inspect for damage. If the bores are scratched then it's scrap. If not, then new seals should fix it. Since the pistons are out you might as well replace the seals. You're going to have to unbolt the calipers in any event to replace the discs. Completely removing the caliper from the car is not much extra work. And you were also going to have to top-up and bleed the brakes no matter what you do.

Whatever you do don't drive the car as it's in a dangerous condition.

[Doctor Gollum]

Could i be lucky and push the pistons back in
Fit new vented discs and good to go
Or is the calliper damaged and seals have to be changed

Visual inspection will soon confirm, but that's about the size of it

Just be sure to push the piston in square

And definitely don't drive it until you have fixed it one way or tother.

[biggriffin]

Don't panic...

Repair kits available from http://biggred.co.uk/

Then buy a pair of vented rear discs.

[Enceladus]

Have you removed the leaking caliper? Seals for 42mm are available, so if the bores aren't scratched and the pistons are undamaged it should be possible to overhaul your unit.

You might even be able to get seals at a local motor factors as 42mm ATE are used on numerous Mercs and other makes. The seals for the piston are the same albeit the caliper might be different. The GM Vauxhall seal kit part # is 9095057 but I doubt if they are available. Maybe on a special order from Germany.

Apologies for the typo in my earlier post. GM seal kit for 42mm ATE is # 9195057. So you're looking for that or a third party equivalent.

And I really don't understand how anybody could remove a pair of 20mm vented discs and then not notice that the replacements he was installing are 12mm thick and solid. Shouldn't be allowed near brakes.

[Doctor Gollum]

Solid discs are literally half the price

Not the first time this has happened, and unfortunately it won't be the last.

[Andy B]

.....
And I really don't understand how anybody could remove a pair of 20mm vented discs and then not notice that the replacements he was installing are 12mm thick and solid. Shouldn't be allowed near brakes.

Likewise but so called professional garages have done it too ...

[YZ250]

On the plus side, the OP has found out before anyone got hurt.    A new pair of vented rear discs and pads and hopefully you're sorted, so it was definitely worth mentioning it on here.   

[tango]

Thanks everyone
I’ll inspect the calliper and will Change the discs and pads on both sides while im at it