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Rear brake caliper-shims; between what & what? #1623803
10/08/2018 20:20
10/08/2018 20:20
Joined: May 2012
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Going North on the A9
dante giacosa Offline OP
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dante giacosa  Offline OP
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Help me out here, team- I'm having a senior moment

We are just about to refit the back brakes on our project car, and I'm damned if I can work out where the caliper-shims go.

The bolts for the calipers pass clean through the brake disc backing plates & hub-carriers from the rear, to thread into the calipers themselves from behind.
Do the caliper-shims fit between these two parts ?

I had it in my mind that they were under bolt heads- but that's not right is it??

click to enlarge

click to enlarge

Last edited by dante giacosa; 10/08/2018 20:23.
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623806
10/08/2018 21:33
10/08/2018 21:33
Joined: Dec 2005
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Lightwater, Surrey, UK
DaveG Offline
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It tells you which way in the workshop manual IIRC. If not, just pull Simon's rear brakes apart and have a look wink


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Rear brake caliper-shims; between what & what? [Re: DaveG] #1623808
10/08/2018 21:46
10/08/2018 21:46
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Auld Reekie
Edinburgh Offline
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Auld Reekie
Originally Posted By DaveG
If not, just pull Simon's rear brakes apart and have a look wink


Splutter....er well, "what a good idea" laugh


idea Or Paul's.....

Last edited by Edinburgh; 10/08/2018 21:47. Reason: idea

[Linked Image]

So there, Photobucket...
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623811
11/08/2018 06:48
11/08/2018 06:48
Joined: Jul 2007
Posts: 316
France
french_coupe Offline
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France
Just done mine. It goes on the bolts as a washer would do. Does that make sense?


lost in space
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623812
11/08/2018 08:03
11/08/2018 08:03
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Going North on the A9
dante giacosa Offline OP
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Hey French-

So; it’s like a combination washer for both bolts (obviously) which fits under the bolt heads..? (Behind the hub carrier)

I had in mind that it might be a spacer, between the caliper and hub.

I went through the manual but it wasn’t massively helpful

Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623814
11/08/2018 10:29
11/08/2018 10:29
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Lightwater, Surrey, UK
DaveG Offline
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The manual say "During re-fitting, remember to fit the shim between the bolts and mounting bracket"


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623817
11/08/2018 11:06
11/08/2018 11:06
Joined: Jul 2007
Posts: 316
France
french_coupe Offline
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France
Yes that is correct Dante.


lost in space
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623896
13/08/2018 04:59
13/08/2018 04:59
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Going North on the A9
dante giacosa Offline OP
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Thanks team-

As improbable as it seemed at the time; you are of course exactly right.

Interestingly, there was a subtle clash in the most obvious alternative orientation.

They are on now- Thankyou for your help...

Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623907
13/08/2018 07:42
13/08/2018 07:42
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dante giacosa Offline OP
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yep-

it was a bit sticky there for a few minutes, I can tell you- we further were confused by these brake pads, which didn't seem to fit 'so well' in the rear callipers...

It all went together though...

click to enlarge

click to enlarge

Last edited by dante giacosa; 13/08/2018 12:15.
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623910
13/08/2018 08:09
13/08/2018 08:09
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Germany
neil_r Offline
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Why did they not fit well?

Are the pad springs placed in the hole in the caliper? Should they not be within the caliper to take up the play?


1997 20V
2000 V6 manual S-Type and 2011 5.0 XKR
2016 Tucson 1.6T AWD
2018 Mazda2 GT
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623914
13/08/2018 10:15
13/08/2018 10:15
Joined: Dec 2005
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Lightwater, Surrey, UK
DaveG Offline
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Yes the "tips" of those spring things on the pads are supposed to push up against the inside of the caliper, either side of the "hole" so that the pads are pushed in towards the centre. It looks likely that you've bent one or more or of the "tips" to fit through the hole?


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623919
13/08/2018 12:20
13/08/2018 12:20
Joined: May 2012
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Going North on the A9
dante giacosa Offline OP
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oh crap

yes- that's exactly what we did.

so they are just supposed to push back from either side of the slot; rather than bite into the slot..?

what a fool.

after everything else we've overcome!

We'll correct that tonight...

it didn't look to me like the pads would sit in position with those springs just 'sat on'. they're didn't seem to be a 'right' place for them to go..
will they not just fall-out; against the centre of the brake disc..?

what would hold them in, then..?

thanks for your feedback

Last edited by dante giacosa; 13/08/2018 12:24.
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623920
13/08/2018 12:34
13/08/2018 12:34
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neil_r Offline
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The profile of the backing plates (the steps for a better description) hold them radially in the caliper bracket. As you push the caliper over the pad springs, this secures the pads on the bracket. The caliper and piston hold the pads either side of the disc.

The only other thing you have to remember is to get the little post on the inner pad to sit between the piston indentations so that the handbrake ratchet is locked. Otherwise, even if the piston does not rotate, the pressure on the pad is very uneven and brake force is reduced. Don't ask me how I know smile


1997 20V
2000 V6 manual S-Type and 2011 5.0 XKR
2016 Tucson 1.6T AWD
2018 Mazda2 GT
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623921
13/08/2018 13:35
13/08/2018 13:35
Joined: May 2012
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Going North on the A9
dante giacosa Offline OP
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I think I'm going to have to see this in situ later on-

yes; we matched the little post into an indentation on the piston; thank you

I could see it wouldn't turn with action of the handbrake- but will it turn with convention hydraulic actuation..?

Thanks for that Neil...

Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623922
13/08/2018 14:10
13/08/2018 14:10
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Germany
neil_r Offline
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As soon as you take the caliper off, you will see how the pad cannot move any closer to the disc hub now that you are looking for it smile

The hydraulic side is independent of the pistons rotational position. They just need to go in and out. Front pistons don't need to be lock smile

The rachet mechanism of the handbrake needs the piston to stay put so that the ratchet can screw against the the piston as the pad wears.


1997 20V
2000 V6 manual S-Type and 2011 5.0 XKR
2016 Tucson 1.6T AWD
2018 Mazda2 GT
Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa] #1623962
14/08/2018 07:13
14/08/2018 07:13
Joined: May 2012
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Going North on the A9
dante giacosa Offline OP
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thanks Neil & Dave;

we nailed it last night; one of our team is an ambidextrous virtuoso, who was able to produce a result, when all others had failed...

afterwards; we got the arch-liner back in again...

click to enlarge

click to enlarge

click to enlarge

Last edited by dante giacosa; 14/08/2018 07:13.

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