Those running uprated front brakes......

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Re: Those running uprated front brakes......

Postby RonR » Wed 18.03.2020, 18:56

It's time to replace my front disks!

My car's wearing Hi-Spec calipers and 285mm Hi-Spec disks at the moment with 16" BBS S2 wheels and there's around 1mm pad overhang.

AFAIK there are 3 disc options:

1. 283mm Discs from PNM: Possibly from 2WD Sierra RS500 re-drilled? - with the mounting bracket machined down by 2mm (1mm overhang + 1mm radius reduction).
2. 285mm Discs from Hi-Spec: Unknown origin - with the mounting bracket machined down by 1mm (1mm overhang).
3. 295mm MTEC964 Discs: Subaru Forester re-drilled - with 4mm spacers between caliper and mounting bracket or new larger brackets (5mm radius increase - 1mm overhang).

I'd just like to check if anyone's fitted the 295mm discs with with Hi-Spec calipers and S2 wheels, and if there were any problems doing it.

Cheers,
Ron
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Re: Those running uprated front brakes......

Postby RonR » Fri 20.03.2020, 15:11

Of course that could also be PNM calipers, 295mm discs and S2 wheels.....
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Re: Those running uprated front brakes......

Postby MPx » Fri 20.03.2020, 18:26

Managed to find my upgrade spreadsheet from BobBs original kit - front and rear. Dating from May 2009, it says I have Hispec Calipers and grooved 294mm discs on the front but there's no mention of whose discs they are and I think part of the sales pitch was that "[m]any" could be used. I've had no probs at the front and they work really well. Kit cost £1362.48 which was a bit eye watering looking back! The rears long since replaced (again!) with the (Golf based?) PNM kit so that the handbrake actually works as well - although I never had the leaky seal issue that so many other Hispec kit users suffered.
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but no longer Carlton no 808 nor Sunbeam S1 :(
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Re: Those running uprated front brakes......

Postby lotusflasherman » Tue 24.03.2020, 11:03

RonR wrote:It's time to replace my front disks!

My car's wearing Hi-Spec calipers and 285mm Hi-Spec disks at the moment with 16" BBS S2 wheels and there's around 1mm pad overhang.

AFAIK there are 3 disc options:

1. 283mm Discs from PNM: Possibly from 2WD Sierra RS500 re-drilled? - with the mounting bracket machined down by 2mm (1mm overhang + 1mm radius reduction).
2. 285mm Discs from Hi-Spec: Unknown origin - with the mounting bracket machined down by 1mm (1mm overhang).
3. 295mm MTEC964 Discs: Subaru Forester re-drilled - with 4mm spacers between caliper and mounting bracket or new larger brackets (5mm radius increase - 1mm overhang).

I'd just like to check if anyone's fitted the 295mm discs with with Hi-Spec calipers and S2 wheels, and if there were any problems doing it.

Cheers,
Ron

Yes. I use MTEC964 discs (Subaru 295mm) with their 4 hole conversion, HiSpec Billet4 calipers spaced out with alloy blocks and longer setscrews. I run 17" wheels so have plenty of clearance but reckon S2 16" would be OK. I have a refurbed S2 wheel that I can use to check if you want.
Phil

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Cars: Subaru Forester 2.5XTN, Eclat Riviera, brace of Pacific Blue SE's, Collapso SE, Elan+S.... and now an Evora
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Re: Those running uprated front brakes......

Postby lotusflasherman » Tue 24.03.2020, 11:35

20180415_191218 768.jpg


clearance to 17" BBS is so much I'm sure S2 wheels will be fine..
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Leave me alone, I think I know what I'm doing.
Cars: Subaru Forester 2.5XTN, Eclat Riviera, brace of Pacific Blue SE's, Collapso SE, Elan+S.... and now an Evora
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Re: Those running uprated front brakes......

Postby RonR » Wed 25.03.2020, 17:32

Thanks for that guys,

Looking at my Disc / Caliper / Wheel combination there's enough room radius-wise to move the caliper out by 4mm but the inward curve of the spokes of the S2 wheels takes them to around 3mm from the caliper:
Wheel+Caliper-285mm-disc.jpg

At the point where the caliper and wheel are nearest there's about a 25-30 degree angle on the spoke, so moving the caliper out radially by 4mm would give about 2.3mm less clearance (tan(30)*4=2.31), close enough for the larger discs to be a marginal fit.
However, if the HiSpec and MTEC disks have different offsets then all bets are off as the calipers would have to be moved in or out laterally to centre them on the discs!

I'm beginning to get one of my Headaches...... :banghead:
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