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Please play nicely.  No one wants to listen/read a keyboard warriors rants....

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Author Topic: What's the best way....  (Read 502 times)

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Sir Tigger QC

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What's the best way....
« on: 01 January 2019, 16:54:25 »

.... to remove a welded on brake disc?  ???

I need to change the rear discs and pads on the Mondeo and made a start this afternoon, only to find that the disc is welded on.  ::)

When I did the fronts last year I smacked 7 bells out of them with the sledgey.  One came off whole, the other in pieces....  :D

Given it's New Years Day and some of the neighbours have family and friends round, I refrained being a considerate chap, so squirted lots of WD40 around and gave it some light taps with the hammer.  ::)

Tomorrow however....  ;D

Unless someone comes up with a better solution.  Heat perhaps?  ???  :-\

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Field Marshal Dr. Opti

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Re: What's the best way....
« Reply #1 on: 01 January 2019, 17:04:09 »

Gentle manipulation with 'sledgy the hammer' should see you right.
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BazaJT

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Re: What's the best way....
« Reply #2 on: 01 January 2019, 17:26:18 »

Must admit my first thought was heat,but would that run the risk of damaging the bearing in some way?Best rust buster I've found is a 50/50 mix of atf-u and acetone.Local stealer uses your primary method of "Sammy".
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Migv6

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Re: What's the best way....
« Reply #3 on: 01 January 2019, 18:42:44 »

A puller ?
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STEMO

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Re: What's the best way....
« Reply #4 on: 01 January 2019, 18:48:44 »

A puller ?
Who are you calling a puller?  ;D
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Sir Tigger QC

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Re: What's the best way....
« Reply #5 on: 01 January 2019, 20:56:06 »

A puller ?

No special tools available.  :(

I have a range of hammers in different sizes, a blowtorch and a gurt big iron bar....  :-\   :)
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Re: What's the best way....
« Reply #6 on: 01 January 2019, 21:13:13 »

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Sir Tigger QC

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Re: What's the best way....
« Reply #7 on: 01 January 2019, 21:35:55 »

Thanks BG!  :y

I havn't taken the caliper bracket off yet, but I took off the caliper and took out the disc screw, gave the disc a tap with the hammer and it's rock solid.  ::)
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Andy H

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Re: What's the best way....
« Reply #8 on: 01 January 2019, 21:50:36 »

I had this problem on the MV6 last month.

I tried a little 'light persuasion' but I wasn't prepared to hit it hard enough to make it let go.

Plan B was to take out the retaining screw and wheel bolts - started the engine, stuck it in 'drive' and applied the brake repeatedly until the disc released it's grip on the hub.  :y

The disc can't go anywhere because the caliper is holding it in place.

Edit - the drag in the gearbox is enough to turn the wheels so no need to apply lots of throttle - just press the brake each time the disc starts turning at about walking pace until it eventually lets go.
« Last Edit: 01 January 2019, 21:54:52 by Andy H »
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Re: What's the best way....
« Reply #9 on: 01 January 2019, 22:01:45 »

I had this problem on the MV6 last month.

I tried a little 'light persuasion' but I wasn't prepared to hit it hard enough to make it let go.

Plan B was to take out the retaining screw and wheel bolts - started the engine, stuck it in 'drive' and applied the brake repeatedly until the disc released it's grip on the hub.  :y

The disc can't go anywhere because the caliper is holding it in place.

Edit - the drag in the gearbox is enough to turn the wheels so no need to apply lots of throttle - just press the brake each time the disc starts turning at about walking pace until it eventually lets go.
.

Old school, workshop practice,, before the elf's. :y
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Webby the Bear

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Re: What's the best way....
« Reply #10 on: 01 January 2019, 22:07:13 »

For whatever reason the mundane-o discs take quite a bit to knock off.
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Sir Tigger QC

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Re: What's the best way....
« Reply #11 on: 01 January 2019, 22:37:28 »

For whatever reason the mundane-o discs take quite a bit to knock off.

Yes it was a hell of a job when I did the fronts last year.  ::)

Ended up smashing one up...  :o
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Andy H

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Re: What's the best way....
« Reply #12 on: 01 January 2019, 22:50:44 »

Oops - my reply isn't going to help in getting the rear discs off a wrong wheel drive car ::)
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Re: What's the best way....
« Reply #13 on: 01 January 2019, 23:20:19 »

Is the hub bolted to the trailing arm?

If yes, unbolt it and place the disc face up on a couple of blocks and smash ten bells of shit out of the centre of it to knock the hub off the disc ::)
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78bex

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Re: What's the best way....
« Reply #14 on: 01 January 2019, 23:35:08 »

.... to remove a welded on brake disc?  ???

I need to change the rear discs and pads on the Mondeo and made a start this afternoon, only to find that the disc is welded on.  ::)

When I did the fronts last year I smacked 7 bells out of them with the sledgey.  One came off whole, the other in pieces....  :D

Given it's New Years Day and some of the neighbours have family and friends round, I refrained being a considerate chap, so squirted lots of WD40 around and gave it some light taps with the hammer.  ::)

Tomorrow however....  ;D


Unless someone comes up with a better solution.  Heat perhaps?  ???  :-\

OK are they deep sleepers  ??? good, won`t take you more then 30 minutes to get the job done if you start it now  ;D
I never hammer from the rear of the disc, there`s always a risk of hitting & deforming the caliper bracket  mounting points. hammer it diagonally across the front face.
The folks next door will just think you`re ringing in the new year......again  :-X
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Shackeng

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Re: What's the best way....
« Reply #15 on: 02 January 2019, 13:12:42 »

When they do come off, refit with some copper slip for ease of removal next time. :y
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Nick W

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Re: What's the best way....
« Reply #16 on: 02 January 2019, 13:43:22 »

When they do come off, refit with some copper slip for ease of removal next time. :y


Wire brush the hubs first - something you should do for any hub face mounted disc. This is a perfect job for a cordless angle-grinder with a cup wire brush.
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Sir Tigger QC

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Re: What's the best way....
« Reply #17 on: 02 January 2019, 16:38:37 »

Well it came off in the end with much hammering, bashing and bad language!  ;D
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Webby the Bear

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Re: What's the best way....
« Reply #18 on: 02 January 2019, 19:46:00 »

For whatever reason the mundane-o discs take quite a bit to knock off.

Yes it was a hell of a job when I did the fronts last year.  ::)

Ended up smashing one up...  :o

Itís almost like the hub and disc hat are an interference fit  Iíve had wheel bearings pop out easier 😂😂😂

I saw one of our guys hit one repeatedly so hard until the hat separated from the disc 😧😧😧😧😧😧😂😂😂

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78bex

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Re: What's the best way....
« Reply #19 on: 02 January 2019, 22:27:34 »

For whatever reason the mundane-o discs take quite a bit to knock off.

Yes it was a hell of a job when I did the fronts last year.  ::)

Ended up smashing one up...  :o

Itís almost like the hub and disc hat are an interference fit  Iíve had wheel bearings pop out easier 😂😂😂

I saw one of our guys hit one repeatedly so hard until the hat separated from the disc 😧😧😧😧😧😧😂😂😂

 The fleet repair co. who serviced the vehicles for the company I last worked for used a really quick & easy method. But of course they had all the kit  8)
The technician first assembled  a 3 legged  puller on the disc & got some tension on the device & sprayed a lot brake cleaner fluid up behind the disc
He swopped the windy gun for an air hammer & hammered on the front face of the disc where it sits on the hub. I`d say after about 2 minutes of this deafening treatment & with his mate increasing the tension on the puller the disc popped off.  ;D
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Re: What's the best way....
« Reply #20 on: 03 January 2019, 08:51:49 »

That's pretty much how I got the rear discs off the Jaguar hubs when I broke it, too.. although replace "air hammer" with "lump hammer" and "popped off" with "came off with such a bang I thought a bomb had gone off" ;D
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Kevin Wood

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Re: What's the best way....
« Reply #21 on: 03 January 2019, 16:43:19 »

That's pretty much how I got the rear discs off the Jaguar hubs when I broke it, too.. although replace "air hammer" with "lump hammer" and "popped off" with "came off with such a bang I thought a bomb had gone off" ;D

The boot came off much easier. As did the engine! ;D
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