Cooper Aluminum Calipers

General Chat with an emphasis on BMC Minis & Other iconic cars of the 1960's. Includes information on MK1 Action days.
360gts
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Re: Cooper Aluminum Calipers

Post by 360gts »

Workinprogress wrote: Mon Feb 05, 2024 11:35 pm Trying to Remember but some old fomula fords I think have used the S calipers. So maybe down that rabbit hole.
Bruce
Bruce
I am pretty sure the Crossle FF used the same Girling alloy calipers I have...used them on my 1071 race car. They needed some grinding to fit inside the Miniilte rims.
I remember my Dad suggesting these as he raced a Crossle.
Cheers
D
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Exminiman
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Re: Cooper Aluminum Calipers

Post by Exminiman »

murty wrote: Mon Feb 05, 2024 9:52 pm Hi,

The only alloy caliper that is a direct fit that I know of is the one Minisport sells (27H4656A and 27H4657A), but these are for a Cooper S.
Do you know the model is for the Girling caliper that fits the S (I'm not aware of this one).

Paul.
Are these any good ? Obviously a weight saving, but I wonder if they suffer from flexing or over heating ?

They seem quite cheap for an aluminium caliper

EDIT this the link to the product https://www.minisport.com/27h4656a-righ ... liper.html
Last edited by Exminiman on Sat Feb 10, 2024 1:09 pm, edited 1 time in total.
Polarsilver
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Re: Cooper Aluminum Calipers

Post by Polarsilver »

Minisport sceptic.. However their 4Pot Caliper(dare i say this ) in my experiences are less hassle than the 4pot Minispares version :o
downside is their logo stuff on the caliper.. :oops:
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Exminiman
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Re: Cooper Aluminum Calipers

Post by Exminiman »

…… its just flexible calipers are not a good plan :D they may be ok ?
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Toby
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Re: Cooper Aluminum Calipers

Post by Toby »

Apparently Lockheed also did alloy ones which were a direct swap for the regular ones. I hadn't seen these before until recently when I had these pictures sent over.
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murty
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Re: Cooper Aluminum Calipers

Post by murty »

Exminiman wrote: Sat Feb 10, 2024 10:43 am
murty wrote: Mon Feb 05, 2024 9:52 pm Hi,

The only alloy caliper that is a direct fit that I know of is the one Minisport sells (27H4656A and 27H4657A), but these are for a Cooper S.
Do you know the model is for the Girling caliper that fits the S (I'm not aware of this one).

Paul.
Are these any good ? Obviously a weight saving, but I wonder if they suffer from flexing or over heating ?

They seem quite cheap for an aluminium caliper

EDIT this the link to the product https://www.minisport.com/27h4656a-righ ... liper.html
I've just fitted them, but car is without engine at the moment. Will soon find out if the braking is worse than the original cast iron calipers.
Yes, they seem too cheap, but I hope they are OK. Otherwise the cast iron calipers go back on.

Paul.
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850RS
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Re: Cooper Aluminum Calipers

Post by 850RS »

murty wrote: Tue Feb 13, 2024 1:54 am
Exminiman wrote: Sat Feb 10, 2024 10:43 am
murty wrote: Mon Feb 05, 2024 9:52 pm Hi,

The only alloy caliper that is a direct fit that I know of is the one Minisport sells (27H4656A and 27H4657A), but these are for a Cooper S.
Do you know the model is for the Girling caliper that fits the S (I'm not aware of this one).

Paul.
Are these any good ? Obviously a weight saving, but I wonder if they suffer from flexing or over heating ?

They seem quite cheap for an aluminium caliper

EDIT this the link to the product https://www.minisport.com/27h4656a-righ ... liper.html
I've just fitted them, but car is without engine at the moment. Will soon find out if the braking is worse than the original cast iron calipers.
Yes, they seem too cheap, but I hope they are OK. Otherwise the cast iron calipers go back on.

Paul.
I ran the aluminum cast calipers from Minisport last season on the race mini and I didn’t notice any performance loss from the steel calipers. When I weighed them the aluminum calipers were 3 lbs lighter per caliper than the steel version.
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timmy201
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Re: Cooper Aluminum Calipers

Post by timmy201 »

murty wrote: Tue Feb 06, 2024 3:15 pm
mk1 wrote: Tue Feb 06, 2024 9:21 am Specs of the CP2696

specs.jpg
Thanks Mark.

I see a couple of differences compared to Cooper S calipers.
The piston diameters are smaller (41mm vs 44mm) and the max disc thickness is thinner (6.4mm vs 10mm).
Also, the specs don’t specify the body size to determine if they’ll fit under 10-inch wheels.
Aren't these the specs of the Cooper 997/998 caliper that the thread is about?

1.625" piston is 41.3mm
1/4" or 6.4mm is the thickness of the std 7.0" disc

There are plenty of dimensions to check for fitment:
https://damclassicracing.com.au/cp2696- ... c-caliper/
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murty
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Re: Cooper Aluminum Calipers

Post by murty »

850RS wrote: Tue Feb 13, 2024 3:16 am
murty wrote: Tue Feb 13, 2024 1:54 am
Exminiman wrote: Sat Feb 10, 2024 10:43 am
Are these any good ? Obviously a weight saving, but I wonder if they suffer from flexing or over heating ?

They seem quite cheap for an aluminium caliper

EDIT this the link to the product https://www.minisport.com/27h4656a-righ ... liper.html
I've just fitted them, but car is without engine at the moment. Will soon find out if the braking is worse than the original cast iron calipers.
Yes, they seem too cheap, but I hope they are OK. Otherwise the cast iron calipers go back on.

Paul.
I ran the aluminum cast calipers from Minisport last season on the race mini and I didn’t notice any performance loss from the steel calipers. When I weighed them the aluminum calipers were 3 lbs lighter per caliper than the steel version.
Thanks for the feedback. That's good news.

Paul.
murty
Posts: 30
Joined: Fri Jan 31, 2020 6:34 pm
Location: California, USA

Re: Cooper Aluminum Calipers

Post by murty »

timmy201 wrote: Tue Feb 13, 2024 3:44 am
murty wrote: Tue Feb 06, 2024 3:15 pm
mk1 wrote: Tue Feb 06, 2024 9:21 am Specs of the CP2696

specs.jpg
Thanks Mark.

I see a couple of differences compared to Cooper S calipers.
The piston diameters are smaller (41mm vs 44mm) and the max disc thickness is thinner (6.4mm vs 10mm).
Also, the specs don’t specify the body size to determine if they’ll fit under 10-inch wheels.
Aren't these the specs of the Cooper 997/998 caliper that the thread is about?

1.625" piston is 41.3mm
1/4" or 6.4mm is the thickness of the std 7.0" disc

There are plenty of dimensions to check for fitment:
https://damclassicracing.com.au/cp2696- ... c-caliper/
Hi Timmy,

Yes, you are correct. I was thinking Cooper S for some reason.

Paul.
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