My brake upgrade

An area for Alfa Racers to share their experiences and plans, along with technical specs and details (if willing!) of their beloved cars.
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adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

My brake upgrade

Post by adsblacksud »

Further to Tim's query I can describe the changes I have made to my front brakes

1. 239mm disc replaced with 257mm disc from an alfa 164 Twin Spark
brembo.jpg
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adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

The disc needed a slight chamfer machining on the inner edge to clear the hub lugs - I have heard that Punto GT discs may not need this work doing.
Attachments
chamfer_0400.jpg

adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

The calipers used are Wilwood Powerlite four pot with 1.38" pistons.
With both nearly a doubling in piston area and disc radius increased 7.5% the braking effect should be increased over standard. As stated before, this will fit under 13 inch revos with no fouling issues.
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disc.jpg
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Last edited by adsblacksud on Mon Feb 23, 2015 10:04 pm, edited 2 times in total.

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PETROLHEAD
Posts: 3045
Joined: Thu Sep 26, 2013 7:51 pm
Location: Nottingham

Re: My brake upgrade

Post by PETROLHEAD »

err just a tad! :D
SHREW

I AM the Law!


Alfasud 1.7-16v, Charade Turbo SR, & The Dirty Diesels - GT Cloverleaf, 159 Ti Sportwagon, Saab 9-3 Sportwagon

adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

The discs are fitted to the hubs with a custom made adaptor.
I made up a dummy in wood, checked the measurements and clearances (three times..) and then got a local engineering company to cnc a pair out of aluminium. It's probably more chunky than it needs to be but it does the job.
Attachments
caliperplanview.jpg
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Last edited by adsblacksud on Mon Feb 23, 2015 9:52 pm, edited 1 time in total.

adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

calipersideview.jpg
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adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

This photo shows the installation from the driveshaft side
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hubdisccaliper.jpg
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adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

Another bracket photo..
Attachments
bracket.jpg

adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

And another..
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bracket1.jpg

adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

I've checked my calculation and the piston area increase is 7% not double as you have to count a sliding single caliper as if it is two pistons.

So we have a 7% increase in piston area and a 7.5 % increase in radius, which whilst not earth shattering is worth having.

The set up is lighter even with the larger disc and should be more efficient over the single piston slider arrangement.

Veesix75
Posts: 1700
Joined: Mon Jan 27, 2014 8:37 pm

Re: My brake upgrade

Post by Veesix75 »

Thanks for this.

Could I have the measurements or do you think the machine shop would make another pair?

adsblacksud
Posts: 138
Joined: Thu Jan 30, 2014 11:49 pm
Location: Wiltshire

Re: My brake upgrade

Post by adsblacksud »

I'll do both - I probably won't have the info until this time next week as I am on the road this week - is that ok?

Veesix75
Posts: 1700
Joined: Mon Jan 27, 2014 8:37 pm

Re: My brake upgrade

Post by Veesix75 »

Thanks, any info is appreciated as and when you have time, thanks again.

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