Changing Polo GTI Front Brake Rotors...

[kaanage]

Well it turns out that the GTi calipers that I was intending to upgrade to have badly corroded pistons due to them sitting unused for a long time

I have done some checking in eBay UK and it seems that the pistons from my stock calipers (the ones for the standard sized 256mm rotors) are the same part as that used for the GTi's (288mm rotor)
(see - VW Polo 1998-2009 FRONT Brake Caliper Piston P5419 | eBay)

Can anyone confirm this?

[brad]

any clues at partsbase.org?

[h100vw]

any clues at partsbase.org?

Greg, get the piston out as the depth is important too. My mate in Adelaide just did this with some calipers. He needed 54 x 54mm which is what those in the link are.

These will be $100 by the time you land them, close to more caliper money?

Are they so bad that you can't recover them with some careful cleaning?

Gavin

[kaanage]

The price of a new set of pistons from VW is over $400!!

The calipers have been unused for over 5 years and are heavily pitted

I have been roaming around parts catalog sites but I have only been able to confirm that the bore diameter for both are 54mm.

Do you think it's safe to just measure the inner depth of the pistons both caliper types?

[h100vw]

The price of a new set of pistons from VW is over $400!!

The calipers have been unused for over 5 years and are heavily pitted

I have been roaming around parts catalog sites but I have only been able to confirm that the bore diameter for both are 54mm.

Do you think it's safe to just measure the inner depth of the pistons both caliper types?

I'd def pull them out Greg. Be a shame if it turned out they were different. You can check the rusty ones easy enough.

Gavin

[kaanage]

The only problem is that I'd have to rebuild my existing caliper and bleed out the system if I do that which I'm not confident I can do properly (especially the bleed)

I may just leave it all with the mechanic and if he finds it's not compatible, then have him rebuild it as is until I can source replacement pistons

[h100vw]

The only problem is that I'd have to rebuild my existing caliper and bleed out the system if I do that which I'm not confident I can do properly (especially the bleed)

I may just leave it all with the mechanic and if he finds it's not compatible, then have him rebuild it as is until I can source replacement pistons

If you plug the line while the caliper is off the car and don't let the reservoir run dry. When you re connect the flexy line to the caliper, the fluid should bleed pretty good. Good enough to drive to someone that can bleed it.

I don't expect you'll find a mech that would rebuild a caliper, they don't work that way these days. They'd want to just chuck the new one on.

Gavin

[kaanage]

My mechanic would like to spend all his time building rally and race cars but fills the gaps servicing normal cars like mine so rebuilding a monobloc caliper isn't a big deal. I'd do it all myself if the bleeding was simple (the ABS unit scares me) and I didn't also need the spindles changed.

[h100vw]

My mechanic would like to spend all his time building rally and race cars but fills the gaps servicing normal cars like mine so rebuilding a monobloc caliper isn't a big deal. I'd do it all myself if the bleeding was simple (the ABS unit scares me) and I didn't also need the spindles changed.

It'll be fine. Even if it ran dry, you can get it back easily.

YOLO

[Jmac]

If you plug the line while the caliper is off the car and don't let the reservoir run dry. When you re connect the flexy line to the caliper, the fluid should bleed pretty good. Good enough to drive to someone that can bleed it.

I don't expect you'll find a mech that would rebuild a caliper, they don't work that way these days. They'd want to just chuck the new one on.

Gavin

Some actually do if we have to. Big can of tar with a big brush there.