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Dec 21, 2022 17:41:39 GMT
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So the fiat 850t brakes are beyond rubbish. The standard set up consists of a single circuit matser cylinder feeding drums all round with non adjustable bonded aluminium shoes. They are notoriously awkward to adjust and are prone to slave cylinder leaks. The cylinders are at the top so this leak then means new shoes, which are done on an exchange basis as they don't make the bodies any more. My plan is to upgrade to a dual circuit master with discs on the front. I had also planned on fitting modern back plates and drum set up on the rear however i'm now wondering if I should just go discs all round. For those with experience of such matters will modern discs be ok taking into consideration the lack of servo and the slightly odd weight balance of a rear engined fiat? I don't plan on racing it but there could be an engine upgrade on the cards. Pic of said 850t just for interest  |
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Dec 21, 2022 21:40:36 GMT
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I would definitely go for an allround disc conversion. But i really dislike drums 😅
I would start by looking at what discs you could use. Pcd, height of the disc and center hole diameter are the first to determine. Size and thickness are also important, determine if they fit inside the wheels.. the less you need to modify on the discs the better it is since these are wearing parts.
After fitting the discs i would look at the callipers. Ideally you would use the complete set of discs and callipers from 1 car. That's a lot easier if you need wear parts in the future. If your donor is faster and/or heavier then your current car you can expect the brakes to be sufficient for your car.
If there's room i would fit a booster. make sure the pedal ratio is correct then. An adjustable brake pressure limiter for the rear brakes would help with balancing things out.
Engine swap sounds good😎
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Dec 22, 2022 17:49:30 GMT
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If it helps I've put together a bit of a brake disc catalogue in excel that you can search for things like stud pattern, depth and OD. |
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Dec 22, 2022 18:15:31 GMT
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I can't remember if X/19s are discs all round. Should be the same stud pattern. Worth looking.
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'57 Austin Cambridge A55 1800 Overdrive
'50 MG Y-type (In build)
'56 Standard Super 10 (In build)
'03 Fiat Stilo Abarth (Wet weather runabout)
'03 Citroen Berlingo HDi (Parts hauler)
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Dec 22, 2022 18:16:49 GMT
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Good call - being mid engined, will have closer weight (& brake) balance than if using the brakes from a front engined car.
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Dec 22, 2022 18:17:25 GMT
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If it helps I've put together a bit of a brake disc catalogue in excel that you can search for things like stud pattern, depth and OD. Google for Brembo aftermarket catalogue. There is a lot of info in it. And you can search on some dimensions as well. 😉 |
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Dec 22, 2022 20:28:55 GMT
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There are plenty modern fiats with rear discs these days so getting discs shouldn't be a problem.
I'll have to make the mounting plates anyway so i guess most small car rear calipers will work.
My main concerns are the lack of servo and whether or not it would be overkill on a small van.
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grumpybadger will brakes from a Fiat 850 Coupe fit.
They are disc/drum and as the Coupe had a wee bit more performance than the T they might be an easy solution.
These vans are not heavy or fast so maybe rear discs are overkill.
Adrian
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Vitesse 6 Saloon
Vitesse Mk2 Convertible
BMW R1150GS
VW Amarok
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grumpybadger will brakes from a Fiat 850 Coupe fit. They are disc/drum and as the Coupe had a wee bit more performance than the T they might be an easy solution. These vans are not heavy or fast so maybe rear discs are overkill. Adrian Discs and calipers should fit despite the different front axle set ups. Those parts can be rare and expensive though Rear brakes are the same as the 850t. |
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Dec 23, 2022 10:33:33 GMT
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If it helps I've put together a bit of a brake disc catalogue in excel that you can search for things like stud pattern, depth and OD. Google for Brembo aftermarket catalogue. There is a lot of info in it. And you can search on some dimensions as well. 😉 Yeah the brembo catalogue is useful, but what made me spend forever copying the information into excel is you're limited on the dimensions you can search for (primarily PCD, but also centrebore or vented/solid). Most of my information has been painstakingly copied from the brembo catalogue! |
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Dec 23, 2022 10:43:29 GMT
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I can't remember if X/19s are discs all round. Should be the same stud pattern. Worth looking. I've poked about with brakes a little on my X1/9. It's quite front-biased as mid-engined brake setups go (about 67% front), but that's probably not a bad thing with your car. The rear calipers are shared with the Fiat 132/Beta Montecarlo and the Lancia Beta, so if you need to change that bias rearward a little then either of those would help. Lancia Beta gives 65% front and Fiat 132/Monte gives 63%. It's a common upgrade on X1/9s to fit Uno Turbo front calipers and discs as they're a little bigger and vented. The rears have an in-built handbrake mechanism in the caliper. It's not an amazing design to be honest, but it does function and cuts out the need to faff about with a drum in the hub. Bore of the X1/9 master is 0.75" and the pedal ratio is about 4.8:1. |
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Last Edit: Dec 23, 2022 10:45:51 GMT by biturbo228
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Dec 27, 2022 19:41:29 GMT
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I have all round discs and no servo on my elan +2, initially it had some regular pads and the initial bite was very poor, greenstuff pads transformed it and it's great now.
You could also fit an in-line servo on the front circuit, I have this on our minor and it works a treat.
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