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+4 brake disc removal #692161
07/03/21 08:11 AM
07/03/21 08:11 AM
Joined: Oct 2017
Posts: 3
G
g2gsoon Offline OP
New to Talk Morgan
g2gsoon  Offline OP
New to Talk Morgan
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Joined: Oct 2017
Posts: 3
Can anyone tell me how to remove the front brake discs on a +4. I want to remove and refurbish or replace my front discs but am not sure how to remove them. Does the hub need removed and if so how.

Re: +4 brake disc removal [Re: g2gsoon] #692164
07/03/21 08:26 AM
07/03/21 08:26 AM
Joined: Nov 2018
Posts: 502
Germany, Rhein-Main Area
X
xc68anc Offline
Talk Morgan Regular
xc68anc  Offline
Talk Morgan Regular
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Joined: Nov 2018
Posts: 502
Germany, Rhein-Main Area
May be this would help:

http://www.talkmorgan.com/ubbthreads.php/ubb/showflat/Number/559373/Searchpage/4/Main/35523/Words/%2BBrake+%2Bdisc/Search/true/workshop-note-s1-roadster-mulfab-brake-upgrade#Post559373

Greets René


2018 plus4
Re: +4 brake disc removal [Re: g2gsoon] #692168
07/03/21 08:59 AM
07/03/21 08:59 AM
Joined: Apr 2008
Posts: 9,735
Gloucestershire, UK
Hamwich Offline
Needs to Get Out More!
Hamwich  Offline
Needs to Get Out More!

Joined: Apr 2008
Posts: 9,735
Gloucestershire, UK
From memory the sequence is:

  • Jack up car
  • Remove road wheel
  • Remove brake caliper, hang it out of the way so the lines aren't under stress. The caliper bolts may be lockwired, mine are.
  • Remove split pin from castellated nut I break off the bent ends and use a pair of long-nosed pliers to wind the pin out
  • Undo castellated nut, withdraw hub and disc
  • Undo the 4 bolts holding the disc to the carrier on the hub
  • Tap the disc free with a rubber/hide/wooden mallet


But don't blame me if there's something I've forgotten smile


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: +4 brake disc removal [Re: g2gsoon] #692170
07/03/21 09:02 AM
07/03/21 09:02 AM
Joined: Feb 2016
Posts: 3,666
East Harling, Norfolk UK
RichardV6 Offline
Talk Morgan Addict
RichardV6  Offline
Talk Morgan Addict

Joined: Feb 2016
Posts: 3,666
East Harling, Norfolk UK
Hi g2gsoon.

This parts book image should help.

[Linked Image]

The brake caliper would need to be unbolted from the stub axle and tied out of the way so as not to strain brake hose. Straightforward disassembly after removing hub nut to allow hubs to be slid off and so gain access to remove disc nuts and bolts from same. After cleaning all parts re-fitting discs and re-greasing bearings, re-assemble with castellated hub nut adjusted to put no pre-load on bearings and no play either before inserting split pin.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: +4 brake disc removal [Re: g2gsoon] #692177
07/03/21 09:50 AM
07/03/21 09:50 AM
Joined: Aug 2015
Posts: 1,007
A
Arwyn Williams Offline
Has a lot to Say!
Arwyn Williams  Offline
Has a lot to Say!
A

Joined: Aug 2015
Posts: 1,007
Once you have removed the calipers, you could probably take the disc off the hub in situ.

Then again might be worth pulling the hubs just to have a check on the wheel bearings.

Also budget on new bolts and nuts to secure the disc to hub. Depending on your year of manufacture, the factory bolted everything together then clouted the end of the bolt over to stop the nut coming off! A disgusting practice!

In terms of reconditioning, assuming you have plain (I.e) non vented discs, I think minimum/replacement thickness us about 8mm. However you don't say what year/model you have so I can't be definite!

Arwyn

Re: +4 brake disc removal [Re: Arwyn Williams] #692182
07/03/21 09:58 AM
07/03/21 09:58 AM
Joined: Feb 2010
Posts: 1,078
SimonH Offline
Has a lot to Say!
SimonH  Offline
Has a lot to Say!

Joined: Feb 2010
Posts: 1,078
Originally Posted by Arwyn Williams
Once you have removed the calipers, you could probably take the disc off the hub in situ.

Then again might be worth pulling the hubs just to have a check on the wheel bearings.

Also budget on new bolts and nuts to secure the disc to hub. Depending on your year of manufacture, the factory bolted everything together then clouted the end of the bolt over to stop the nut coming off! A disgusting practice!

In terms of reconditioning, assuming you have plain (I.e) non vented discs, I think minimum/replacement thickness us about 8mm. However you don't say what year/model you have so I can't be definite!

Arwyn


Arwyn, the disc comes off the back of the hub, it can’t be removed without removing the hub from the stub axle

With regards to disc thickness, depending on the cars vintage it will either be fitted with 3/8” or 1/2” thick discs (9.35mm or 12.7mm), maximum wear limit is 40thou or 1mm less than these values

You will always need to replace the disc to hub bolts as the lead thread is peened over by the factory to lock them in place. The peening destroys the thread as they are removed


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: +4 brake disc removal [Re: g2gsoon] #692190
07/03/21 10:56 AM
07/03/21 10:56 AM
Joined: May 2010
Posts: 7,850
Llanelli
sospan Online happy
Talk Morgan Guru
sospan  Online Happy
Talk Morgan Guru

Joined: May 2010
Posts: 7,850
Llanelli
Also be prepared for the disc to be stuck on the hub. Possible on older cars. Soak the area where the hub meets the disc with release fluid. Leave it to do its job. Try pulling the disc off but you may need more rust release fluid, a bench press would make this easier but careful drifting should do it. Keep the hub bearing areas sealed off.
Two years ago I upgraded with new solid discs and Mulfab callipers with braided pipes. The old discs were QUITE tight so used careful drifting to ease them apart. Hubs off and soaked the mating joints overnight on the bench. I put a VERY small smear of copper grease on the hub/calliper mating surfaces before bolting back on. Clean everything thoroughly before refitting callipers.


Red Plus8
Re: +4 brake disc removal [Re: g2gsoon] #693373
13/03/21 05:30 PM
13/03/21 05:30 PM
Joined: Oct 2017
Posts: 3
G
g2gsoon Offline OP
New to Talk Morgan
g2gsoon  Offline OP
New to Talk Morgan
G

Joined: Oct 2017
Posts: 3
Thanks guys. I now have the confidence to tackle the job. Mine is a 1999 car and the threads on the disc to hub bolts are well and truly peened so I will angle grind the ends of the bolts to remove the peened material and replace, possibly with stainless nuts and bolts (peened of course).

Re: +4 brake disc removal [Re: g2gsoon] #693379
13/03/21 06:01 PM
13/03/21 06:01 PM
Joined: Aug 2010
Posts: 3,605
Costock, South Nottinghamshire...
Paul F Offline
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Paul F  Offline
Talk Morgan Addict

Joined: Aug 2010
Posts: 3,605
Costock, South Nottinghamshire...
I am not sure I would use stainless in that application. Better to stick with the high tensile bolts as original. Someone who knows more than me about metal will be along in a moment I suspect but I was under the impression that stainless fastenings are not as strong,


Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 4
Teddy - 17h1 Irish Draught cross
Re: +4 brake disc removal [Re: g2gsoon] #693381
13/03/21 06:03 PM
13/03/21 06:03 PM
Joined: Oct 2019
Posts: 1,819
Aberdeenshire
Image Offline
Talk Morgan Enthusiast
Image  Offline
Talk Morgan Enthusiast

Joined: Oct 2019
Posts: 1,819
Aberdeenshire
g2gsoon ..... I wouldn't use stainless for a safety critical part .... it's banned from suspension areas etc for racing ..... of course this might just be a personal bee in my bonnet, in which case no doubt someone will correct me.


K

Paul F ...... snap .... our posts crossed in the ether

Last edited by Image; 13/03/21 06:04 PM.
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