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#1623803 - 10/08/2018 22:20 Rear brake caliper-shims; between what & what?
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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


Edited by dante giacosa (10/08/2018 22:23)

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#1623806 - 10/08/2018 23:33 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6953
Loc: Lightwater, Surrey, UK
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

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#1623808 - 10/08/2018 23:46 Re: Rear brake caliper-shims; between what & what? [Re: DaveG]
Edinburgh Offline
Club Board member
I AM a Coop

Registered: 04/03/2007
Posts: 10114
Loc: 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.....


Edited by Edinburgh (10/08/2018 23:47)
Edit Reason: idea
_________________________


So there, Photobucket...

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#1623811 - 11/08/2018 08:48 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
french_coupe Offline
Club member 773
Making a profit

Registered: 14/07/2007
Posts: 314
Loc: France
Just done mine. It goes on the bolts as a washer would do. Does that make sense?
_________________________
lost in space

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#1623812 - 11/08/2018 10:03 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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

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#1623814 - 11/08/2018 12:29 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6953
Loc: Lightwater, Surrey, UK
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

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#1623817 - 11/08/2018 13:06 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
french_coupe Offline
Club member 773
Making a profit

Registered: 14/07/2007
Posts: 314
Loc: France
Yes that is correct Dante.
_________________________
lost in space

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#1623896 - 13/08/2018 06:59 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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...

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#1623907 - 13/08/2018 09:42 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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


Edited by dante giacosa (13/08/2018 14:15)

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#1623910 - 13/08/2018 10:09 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
neil_r Offline
Enjoying the ride

Registered: 16/08/2007
Posts: 780
Loc: Germany
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?

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#1623914 - 13/08/2018 12:15 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6953
Loc: Lightwater, Surrey, UK
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

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#1623919 - 13/08/2018 14:20 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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


Edited by dante giacosa (13/08/2018 14:24)

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#1623920 - 13/08/2018 14:34 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
neil_r Offline
Enjoying the ride

Registered: 16/08/2007
Posts: 780
Loc: Germany
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

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#1623921 - 13/08/2018 15:35 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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...

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#1623922 - 13/08/2018 16:10 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
neil_r Offline
Enjoying the ride

Registered: 16/08/2007
Posts: 780
Loc: Germany
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.

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#1623962 - 14/08/2018 09:13 Re: Rear brake caliper-shims; between what & what? [Re: dante giacosa]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9
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


Edited by dante giacosa (14/08/2018 09:13)

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