Well this 5 min job hasn't gone as planned!

[GE90]

I'm sure others have been there too! Quick job turning turning into a bit of a disaster.

Front discs and pad changes, on putting back together noticed a calliper piston seal weeping. Wasn't expecting that on a 2018 20k mile Cayman!

Typically, 5 mins after nearby Porsche garage closed for the long weekend, so cannot get new seals!

Managed to borrow an air line at local tyre place and popped the piston out.

Any tips for getting the piston back in when I have a new seal and dust seal?

Thanks!

Edited by GE90 on Saturday 29th April 17:52

[GreenV8S]

GE90 said:

calliper position seal weeping

Piston seal?

Check the condition of the bore in case the seal was damaged by something that got past the dust seal. Use brake fluid as a lubricant on reassembly. Make sure the piston goes back in square. A piston push-back tool is a convenient way to press the piston back in while keeping it square.

Edited by GreenV8S on Saturday 29th April 21:10

[Wheatsheaf]

In my experience if everything is clean and assembled correctly and you offer the piston up square to the bore then it will simply push in with hand pressure.

Not sure about yours but some seals are profiled such that they need to be inserted a certain way round (so that the piston is "pulled back in" when pressure is released).

[GE90]

Thanks for the replies.

The tip regarding the seals perhaps being profiled is appreciated!

[stevieturbo]

Wheatsheaf said:

In my experience if everything is clean and assembled correctly and you offer the piston up square to the bore then it will simply push in with hand pressure.

Not sure about yours but some seals are profiled such that they need to be inserted a certain way round (so that the piston is "pulled back in" when pressure is released).

All true, pistons should push in quite easily. Also use a little red/rubber grease on the seals and piston.

And absolutely, almost always the seals will have an orientation

[GE90]

Thanks. Red/rubber grease rather than some clean brake fluid?

Assuming a very minor profile difference, possibly hard to detect, any ideas on how to determine direction of the seal?

[LivLL]

Have a look on Bigg Red too, if you can wait it’s probably worth doing all the seals now they’re out and in bits.