Front brake callipers carrier bolts

[birdy_z4]

Hi All

So replacing my front brake discs

Anyone know what the bolt size is?

Not 19mm

Is it 18mm ??

Tried all the sockets and spanner’s so unusual size :-(

 

[Umfaan]

Possibly 16mmm

 

[Pondy]

They are a standard metric size, 18mm

And they will (or should) be really tight.

 

[birdy_z4]

They are a standard metric size, 18mm

And they will (or should) be really tight.

Thanks all cheers for the advice

 

[B21]

Torx screw 12 mm?

 

[Pondy]

Thanks all cheers for the advice

There is a trick for popping the disc off the hub if you need it. It involves an M8 bolt and three nuts.

 

[birdy_z4]

Thanks all 18mm socket ordered

Managed to get the old discs off without removing the carrier but new ones won’t go in without removing it

 

[enuff_zed]

Thanks all 18mm socket ordered

Managed to get the old discs off without removing the carrier but new ones won’t go in without removing it

I have to say I'm surprised there's no 18mm in a standard socket set?

 

[bg1]

Thanks all cheers for the advice

There is a trick for popping the disc off the hub if you need it. It involves an M8 bolt and three nuts.

Go on - tell us!

 

[enuff_zed]

Thanks all cheers for the advice

There is a trick for popping the disc off the hub if you need it. It involves an M8 bolt and three nuts.

Go on - tell us!

Take an M8 bolt, any length will do. Select three nuts.
Lay them all neatly in a tray.
Take a large rubber mallet and knock the disc off.

 

[Pondy]

Take an M8 bolt, any length will do. Select three nuts.
Lay them all neatly in a tray.
Take a large rubber mallet and knock the disc off.

That's one way, yes!
There is a youtube video showing how but I can't find it :roll:
You put the bolt(s) through the hole(s) of the calliper carrier against the inside of the disc with nuts to hold it in position. Then using the nuts wind the bolt into the disc face. It works like a reverse puller, so a pusher in effect.
It's hard to explain but is very simple and works really well.

 

[enuff_zed]

Take an M8 bolt, any length will do. Select three nuts.
Lay them all neatly in a tray.
Take a large rubber mallet and knock the disc off.

That's one way, yes!
There is a youtube video showing how but I can't find it :roll:
You put the bolt(s) through the hole(s) of the calliper carrier against the inside of the disc with nuts to hold it in position. Then using the nuts wind the bolt into the disc face. It works like a reverse puller, so a pusher in effect.
It's hard to explain but is very simple and works really well.

I suspect you'd need to rotate the disc a couple of times or it may twist and get stuck?
TBF though, usually once you break the initial resistance it comes away easily.

 

[Pondy]

I suspect you'd need to rotate the disc a couple of times or it may twist and get stuck?

I did the above with all four of mine purely as I was concerned with damaging the centre hub by smacking the very edge of the discs with a hammer. The bolt method puts the pressure nearer the centre of the disc and they 'pop' off. Hardest thing was finding bolts long enough (need at least 70mm IIRC).
I also have an irrational fear of the car falling off the trolley jack if I belt anything too hard

 

[BeeEmm]

I also have an irrational fear of the car falling off the trolley jack if I belt anything too hard

I would say that was completely rational. I feel the same.

 

[enuff_zed]

I also have an irrational fear of the car falling off the trolley jack if I belt anything too hard

I would have a perfectly rational fear of working with you if you leave it just on a trolley jack. :wink:

 

[flybobbie]

Kettle of boiling water over disc and will pull straight off.