Can't get a brake disc off

[Homer]

I'm getting really fed up with seized parts now...

 

I have a hub and disc assembly off a salvage car that has been stood for something like 2 years. The brake shoes are not seized (they are wound fully in) on as the disc and driveshaft spin freely in the hub, but the disc refused to come off. There doesn't appear to be any type of grub screw holding it in place either. I've tried hitting it with a mallet, hammer, then a bigger hammer, but it refused to come away from the hub.

 

Am I missing something obvious here? Any tips/tricks to seperate the two?

[RobSheffield]

Have you tried a bolt in the 2 threaded holes at 2 o clock and 8 o clock?

[Lee P]

Bigger hammer!

[JustGav]

Have you tried a bolt in the 2 threaded holes at 2 o clock and 8 o clock?

 

That is indeed the correct answer

[Homer]

Have you tried a bolt in the 2 threaded holes at 2 o clock and 8 o clock?

Threaded holes you say...? Didn’t spot those...

 

Cheers Rob, once again you've pointed what would be blindingly obvious to any competent person!

[RobSheffield]

Put little circles round them for you mate:)

[Homer]

Put little circles round them for you mate:)

 

Thanks mate, to be honest they were so full of crud even after a really good clean I still didn't notice any thread on them. Will give it another shot tomorrow

[Tricky-Ricky]

You may be able to clean them out enough with a tap, failing that get some heat on it;)

[Homer]

You may be able to clean them out enough with a tap, failing that get some heat on it;)

 

Oooh goodie, finally get to use the tap and die set bought 3 years ago! Failing that I'll get the bonfire started

[dangerous brain]

First thing I thought was get the heat gun on it. Bit of blow torch should start to shift it and a tad more violence with a dead-blow hammer, If you don't have a dead blow go with a copper drift and a lump hammer.

 

PS whack it on the surface that the studs stick out of not in the natural direction ie on the opposite side on the disc face.

 

PPS you won't get a tap in that hole as they are heavily tapered and won't have any bite at that depth.

 

PPPS if it still doesn't give try hitting the disc on the housing in 90 degrees to the studs with a dead blow/ copper drift/hammer combo

 

 

Oh and if that doesn't work get it on a hydraulic bearing press

Edited May 14, 2008 by dangerous brain (see edit history)

[Tricky-Ricky]

Oooh goodie, finally get to use the tap and die set bought 3 years ago! Failing that I'll get the bonfire started

 

I would get the barbecue out at least you can have a bite to eat and a few cans if all else fails;)

[SUPRASUZUKI]

Have a look at the discs I dropped off with you. You'll see the tapped holes clear enough, as I used them to get the discs off my car. Wind the bolts in alternately, half a turn at a time, to pull the disc off squarely.

 

I managed to go straight in with the bolt rather than have to clean the threads with a tap.

 

Use a flat bottomed tap, as a tappered tap might bottom out before engaging fully with the thread.

[Chris Wilson]

8mm normal metric thread (1.25) bolts go in the tapped holes, unless you have 8mm bottoming taps you won't clear the threads with a tap, the taper will bottom on the hub before the tap starts cutting. Heat will help. If the discs are scrap then a big hammer used like a mad man will break them. Use safety goggles and don't do it near anything you don't want hitting with shards of cast iron.

[Homer]

All sorted

 

Had to clean the thread out with a tap, screwed in a couple of bolts and it popped straight off.

 

Thanks again for you help fella's!