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Brake Disc Removal #674740
25/11/20 08:43 PM
25/11/20 08:43 PM
Joined: Apr 2017
Posts: 1,329
Staffordshire
IvorMog Offline OP
Has a lot to Say!
IvorMog  Offline OP
Has a lot to Say!

Joined: Apr 2017
Posts: 1,329
Staffordshire
Sometime in the not too distant future I'm going to be changing my brake discs.

A while back when I had the hubs off I did try a half hearted attempt to separate the hub and the disc but they were seized solid and as I didn't need to get it done for the job I was doing I left them as a job to be done later.

Well later has arrived.

Will penetrant be enough to get the job done and if so what does the team consider to be the best penetrant.

I would prefer to avoid using too much heat so it doesn't damage the grease seals as I changed them a year ago.

Is this an excuse to buy a small bench press as an essential item?

Thoughts please?


Bob

1999 4/4 2 litre Zetec
Re: Brake Disc Removal [Re: IvorMog] #674741
25/11/20 08:54 PM
25/11/20 08:54 PM
Joined: Apr 2008
Posts: 9,562
Gloucestershire, UK
Hamwich Online content
Needs to Get Out More!
Hamwich  Online Content
Needs to Get Out More!

Joined: Apr 2008
Posts: 9,562
Gloucestershire, UK
I would use PlusGas, that's been the best in my experience. Rather than using heat, if you can get the hub secure in a vice you could use a brass drift to apply a bit of shock to free the discs. It's many years since I did mine but I think I might have used an old screwdriver as a wedge to get between disc and mount.

You won't need me to tell you to spend a lot of care to make sure the new discs are truly bedded square with the hub, even a fraction of runout will cause horrible pulsing in the brake pedal.


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: Brake Disc Removal [Re: IvorMog] #674751
25/11/20 11:58 PM
25/11/20 11:58 PM
Joined: May 2010
Posts: 7,590
Llanelli
sospan Offline
Talk Morgan Guru
sospan  Offline
Talk Morgan Guru

Joined: May 2010
Posts: 7,590
Llanelli
I did mine last year. Standard solid discs replacement with HiSpec callipers and stainless flexi hoses. I had discs ready and bought the rest from Mulfab. I didn’t go with vented discs as the standard ones are more than good enough for road use. The new flexi hoses are an improvement.
My discs were stuck solid. Rust. The mating area with the hub. I took the hubs off to split the discs off.
I soaked them with Plusgas, leaving them overnight. If only I had a press! They were persuaded off with repeated tapping with a drift. The hub bearings were protected.
When you do yours clean the mating surfaces before refitting, the hub mainly as the disc will be new. I also put some copper grease on the mating surfaces, very light brushing on. As mentioned, make sure the disc is located on the hun squarely. A final clean with sprayed on brake cleaner.
I finished the job by replacing the brake fluid as well. An Eazibleed made that easier.


Last edited by sospan; 26/11/20 12:01 AM.

Red Plus8
Re: Brake Disc Removal [Re: IvorMog] #684071
19/01/21 05:28 PM
19/01/21 05:28 PM
Joined: Apr 2017
Posts: 1,329
Staffordshire
IvorMog Offline OP
Has a lot to Say!
IvorMog  Offline OP
Has a lot to Say!

Joined: Apr 2017
Posts: 1,329
Staffordshire
Finally got round to replacing the discs.

Good soaking with Plusgas and a little "gentle" help from my trusty brass drift separated the disc and hub reasonably easily.

Cleaned everything thoroughly, especially the mating faces and I'm very pleased to say I only have .03 / .04 mm runout TIR. Or less than 2 thou in old money.

I'm going to try Mintex 1144 pads after a chat with Cain. Hope they're no too dusty.


Bob

1999 4/4 2 litre Zetec
Re: Brake Disc Removal [Re: IvorMog] #684079
19/01/21 05:55 PM
19/01/21 05:55 PM
Joined: Nov 2015
Posts: 3,215
Yorkshire
CooperMan Offline
Talk Morgan Addict
CooperMan  Offline
Talk Morgan Addict

Joined: Nov 2015
Posts: 3,215
Yorkshire
Bob, whilst on the subject of Mintex their Ceratec anti-seize/squeal grease is better than copper slip


Jon M
Re: Brake Disc Removal [Re: IvorMog] #684100
19/01/21 07:44 PM
19/01/21 07:44 PM
Joined: Feb 2010
Posts: 1,024
SimonH Offline
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SimonH  Offline
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Joined: Feb 2010
Posts: 1,024
Originally Posted by IvorMog
Finally got round to replacing the discs.

Good soaking with Plusgas and a little "gentle" help from my trusty brass drift separated the disc and hub reasonably easily.

Cleaned everything thoroughly, especially the mating faces and I'm very pleased to say I only have .03 / .04 mm runout TIR. Or less than 2 thou in old money.

I'm going to try Mintex 1144 pads after a chat with Cain. Hope they're no too dusty.



I think I’ve got a set on the shelf

Make sure you bed them properly or else they are squeaky as hell at low speed


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: Brake Disc Removal [Re: IvorMog] #684101
19/01/21 07:55 PM
19/01/21 07:55 PM
Joined: Jun 2015
Posts: 735
North Somerset, UK
Deejay Offline
Talk Morgan Regular
Deejay  Offline
Talk Morgan Regular

Joined: Jun 2015
Posts: 735
North Somerset, UK
Originally Posted by IvorMog


I'm going to try Mintex 1144 pads after a chat with Cain. Hope they're no too dusty.


As I may need to change pads later in the year, be really pleased to hear how you get on with these. Although Simon has often recommended them as a good pad, I see also his advice above to avoid the squeaks.


Doug

2011 +4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
Re: Brake Disc Removal [Re: IvorMog] #684104
19/01/21 08:10 PM
19/01/21 08:10 PM
Joined: Aug 2013
Posts: 3,128
Solihull
Spanner Juggler Offline
Talk Morgan Addict
Spanner Juggler  Offline
Talk Morgan Addict

Joined: Aug 2013
Posts: 3,128
Solihull
If it’s a one off light press job you can sometimes use a trolley/bottle/screw jack and a couple of wood blocks, then a length of stout timber in the garage door frame.

It’s only normally a very light load to separate them but if tight a light press and a tap with a brass drift works wonders.

BR
Colin


BR Colin
Who used to be a Spanner Juggler
Re: Brake Disc Removal [Re: IvorMog] #684105
19/01/21 08:12 PM
19/01/21 08:12 PM
Joined: Apr 2017
Posts: 1,329
Staffordshire
IvorMog Offline OP
Has a lot to Say!
IvorMog  Offline OP
Has a lot to Say!

Joined: Apr 2017
Posts: 1,329
Staffordshire
Mintex do seem to be quite specific about bedding in their "racing" pads.

Varies a bit depending on which compound, the 1144 being the least racey and therefore bed in with lighter applications and speeds.

On the 1144 they recommend 3 or 4 light applications from 30 to 0 then 6 or 7 medium applications from 70 to 30.

Must make sure my rear view mirror is well adjusted.


Bob

1999 4/4 2 litre Zetec
Re: Brake Disc Removal [Re: CooperMan] #684142
20/01/21 07:32 AM
20/01/21 07:32 AM
Joined: Feb 2016
Posts: 3,425
East Harling, Norfolk UK
RichardV6 Offline
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RichardV6  Offline
Talk Morgan Addict

Joined: Feb 2016
Posts: 3,425
East Harling, Norfolk UK
Originally Posted by CooperMan
Bob, whilst on the subject of Mintex their Ceratec anti-seize/squeal grease is better than copper slip

I was both surprised and pleased that our local old school village mechanic approaching retirement was aware of the negatives of using Copperslip and used the correct stuff when replacing pads on our Mini recently.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
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