Cracked Rear Disc After 4 Weeks?

[M@tt_182]

As title I fitted brand new OEM discs and pads on the rear and today someone noticed a crack all the way down one of them! Main suggestion is a sticky piston which has caused the disc to heat up excessively? When I wound them back in it was a little tight but not bad.

Any ideas?

 

[Bluebeard]

You've answered your own question.

 

[ChrisP_182]

That'll be the reason mate, same thing happened to me

 

[M@tt_182]

Any advise to loosen up the pistons?

 

[ChrisP_182]

Tried to sort mine but just ended up getting another caliper for about 40 quid

 

[GrahamS]

wind them back and forth a few times. Makes sure the caliper is free to move on the sliders as often they get a little stuck and need freeing up.

 

[Sam@NP]

What torque was the nut on the stub axle done up too?

 

[GrahamS]

Whether it was done up tight or slack it shouldn't cause the disc to crack. On the note, you can replace it with the following

http://www.ebay.co.uk/itm/Eicher-Re...rParts_SM&fits=Model:Clio&hash=item51b361c81c

and

http://www.ebay.co.uk/itm/RENAULT-C...arts_Vehicles_CarParts_SM&hash=item2331514137 (these bearings fit the discs despite what it says in the description)

and

http://www.ebay.co.uk/itm/RENAULT-C...arts_Vehicles_CarParts_SM&hash=item1e68a04330

175nm is the figure though

 

[Sam@NP]

The nut controls the preload in the bearing if its done up too tight it will cause the bearing to run hot and that heat will add to the heat in the disk. Not the most likely cause but can still be a contributing fact.

 

[GrahamS]

Are you saying the OP is super matcho. I'm a weed so more than 175nm and my bones would snap

 

[Bluebeard]

Are you saying the OP is super matcho. I'm a weed so more than 175nm and my bones would snap

You don't need to be macho to own a 4ft extension bar. ;-)