XSeries-forum

Hello everyone,

New member here, been browsing the site for a while after the purchase of my 2006 3.0d X5 but this is my first post.

I recently bought a caliper rebuild kit and some new front caliper pistons to sort my binding front brakes.
Upon reassembly I noticed I had been sent new pistons that had 9.6mm piston collars (I ordered the correct 6mm ones)
BMW changed the pistons to 6mm collar versions in Nov 2005 (as well as a different seal & dust cover).
Does anyone know if using the 9.6mm collar versions will cause a problem?
I know BMW must have changed the pistons to smaller collar versions for a reason, and i'm hoping someone can shed some light on why

Any help would be much appreciated, thank you in advance

Rich

Did you ever get an answer to your question about collar size, I just bought a kit with 9.6mm collar & mine are 6mm. I have an August 2005 E53 X5

Mark

I get my brake parts from biggred.co.uk never had a wrong part and good prices quick delivery as well.

By collar do you mean the area between the piston seal groove and the front of the piston?
I have a new set for mine from big red but never got round to fitting them.
I cured my sticking caliper by just pushing the piston in and out a few times.
Maybe I should fit them..