Front and rear back plates

[macafee2]

Are the front and rear back plates for the brakes held on by Allen bolts that require a 7mm Allen key to undo them?
I think it's 7mm
cant see it in Haynes or rave but I think it's 7mm

thanks

macafee2

[trikey]

You think correctly, it is a 7mm Allen key.

[marinabrian]

To replace the front backplates, which are secure with standard M6 bolts, the drive flange must be pressed out of the wheel bearing

Not as easy as it sounds either

Brian

[trikey]

Ahh, backplates! I thought it was the caliper carriers (This is wht you get when reading posts after a few Guinness!!)

The rears are held on with four 6mm headed cap screws.

Cant remember the size of the fronts for sure, im thinking 8mm Hex???

[Jim Jamieson]

Front ones need a 7mm spanner but you can remove them as I have done by clipping a small position away from the front edge which allows removal.

When I fitted my new plates to both my 75’s a few years back I cut away that same section and machined the cut edges before painting them.

On my current project 75 I’ve just removed them and cleaned them up as at almost 16 years old amazingly there still in perfect nick.

[macafee2]

Originally Posted by marinabrian

To replace the front backplates, which are secure with standard M6 bolts, the drive flange must be pressed out of the wheel bearing

Not as easy as it sounds either

Brian

Oh blow, I thought it was going to be easy. Thank you Brian for the pdf file, I appreciate it. I thought hub would be easy to remove and then the back plate would all but fall off.
I'll have to source assistance with pressing the hub apart and reassembly as I don't have a press but I do want to replace my back plates.

This is a bit of a blow.

macafee2

[macafee2]

Originally Posted by Jim Jamieson

Front ones need a 7mm spanner but you can remove them as I have done by clipping a small position away from the front edge which allows removal.

When I fitted my new plates to both my 75’s a few years back I cut away that same section and machined the cut edges before painting them.

On my current project 75 I’ve just removed them and cleaned them up as at almost 16 years old amazingly there still in perfect nick.

There was a thread where someone cut a slot in them but I did not want to do that. Any chance you could do me a diagram of where you removed from the front edge?

thanks

macafee2

[zedhed]

I just chopped off the thin strip of metal,job done.

[suzublu]

Just cut the thinnest piece & slide over the hub.

[kbonney88]

I have replaced 4 fronts in the past month..

and they "should be" 7mm headed hex head.. and if you are lucky and there isnt much corrosion on them a 7mm ring will bite if gently tapped onto the bolt using a small hammer and punch.

If it doesnt I tap a 6mm ring onto it, it only needs to bite enough to "crack it" then it can be undone by hand.

and I also cut the thin piece of metal joining the centre of the backplates to get them round the hub..

hope that helps.

Kev..