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Larger rear brakes #1604563
16/07/2017 14:31
16/07/2017 14:31
Joined: Nov 2016
Posts: 74
Durham
pvig73 Offline OP
Reaping the fruits
pvig73  Offline OP
Reaping the fruits

Joined: Nov 2016
Posts: 74
Durham
Afternoon all. Hope everyone is having a good weekend?

I am thinking of getting larger rear discs for my 20VT and I wanted to know if anyone has done this on a road car and if so is it worth it? If so which discs/calipers/pads did you use?

I find that the rears are so small compared to the fronts and can only assume it's due to the rear of the car being much lighter than the front that this is the reason for the small discs?!

I am hoping to go for Compbrake front two piece discs (not sure of which pads to use yet) and braided lines. The lines I've heard to give the pedal a better, tighter bite.

Thanks in advance,
Paolo.

Re: Larger rear brakes [Re: pvig73] #1605379
31/07/2017 08:34
31/07/2017 08:34
Joined: Nov 2016
Posts: 74
Durham
pvig73 Offline OP
Reaping the fruits
pvig73  Offline OP
Reaping the fruits

Joined: Nov 2016
Posts: 74
Durham
Anyone??

Re: Larger rear brakes [Re: pvig73] #1605386
31/07/2017 10:53
31/07/2017 10:53
Joined: Oct 2013
Posts: 1,290
Staffs
Dazvr6 Offline
My job on the forum
Dazvr6  Offline
My job on the forum

Joined: Oct 2013
Posts: 1,290
Staffs
It's probably not worth it for a road car unless you just want them to fill the wheels more.
You need to be careful that you don't go too big for the back, as it can give some interesting handling braking hard into a fast corner!

Last edited by Dazvr6; 31/07/2017 10:54.
Re: Larger rear brakes [Re: Dazvr6] #1605388
31/07/2017 11:22
31/07/2017 11:22
Joined: Feb 2006
Posts: 5,390
Essex
Trappy Offline
Forum is my life
Trappy  Offline
Forum is my life

Joined: Feb 2006
Posts: 5,390
Essex
Wouldn't increasing the size of rear discs make no difference to the brake bias? You'd just be spreading the same force over a larger area, right?

I'm probably horribly wrong here but the front / rear brake bias will surely be fixed...


F****** b****** thing...
Re: Larger rear brakes [Re: Trappy] #1605389
31/07/2017 11:43
31/07/2017 11:43
Joined: Feb 2006
Posts: 5,390
Essex
Trappy Offline
Forum is my life
Trappy  Offline
Forum is my life

Joined: Feb 2006
Posts: 5,390
Essex
This is a good read on he subject thumb

Brake Bias and Performance


F****** b****** thing...
Re: Larger rear brakes [Re: pvig73] #1605398
31/07/2017 15:00
31/07/2017 15:00
Joined: Dec 2005
Posts: 17,366
Staffordshire
Nigel Offline
Forum veteran
Nigel  Offline
Forum veteran

Joined: Dec 2005
Posts: 17,366
Staffordshire
Firstly, I would suggest you do a Google search for "compbrake problems"

Secondly, two-piece floating discs are already available off-the-shelf for the Coupe. You need Fiat 500 695 discs (also available as options for the 595). The price is steep - around £600 the pair, maybe more. The performance is a significant step up from standard cast discs and the weight saving is a bonus too.

Thirdly, there's no point upgrading the rear discs. They are already more than capable of locking up the rear wheels under heavy braking (assuming you have half-decent pads fitted). All you need to do is make sure the load apportioning valve is working and adjusted properly and that you have a decent set of pads installed. Any more is overkill and a waste of money

All the above IMHO, of course....


[Linked Image]
Re: Larger rear brakes [Re: pvig73] #1605420
01/08/2017 06:36
01/08/2017 06:36
Joined: Nov 2016
Posts: 74
Durham
pvig73 Offline OP
Reaping the fruits
pvig73  Offline OP
Reaping the fruits

Joined: Nov 2016
Posts: 74
Durham
Thanks all.

Admittedly, I forgot I posted this until yesterday :-)

Ok, definitely won't go Compbrakes after reading about various (many) issues. I will look into the 500A 695 discs and may even get a discount from the Fiat/Abarth dealer I worked at many moons ago.

As for the rears, I was thinking of going drilled with decent pads as I do think the reason I wanted bigger rear discs was to fill out the wheels more. I just think they look tiny in comparison to the fronts.

Again, thanks for the info guys.
Paolo.

Re: Larger rear brakes [Re: Trappy] #1605437
01/08/2017 09:05
01/08/2017 09:05
Joined: Aug 2007
Posts: 869
Germany
neil_r Offline
Enjoying the ride
neil_r  Offline
Enjoying the ride

Joined: Aug 2007
Posts: 869
Germany
Originally Posted By Trappy
This is a good read on he subject thumb

Brake Bias and Performance


Interesting read - thanks!

Like I always say, the cheapest and most effective upgrade (after a strut brace for a wobbly coupe) are the best modern tyres you can find.


1997 20V
2000 V6 manual S-Type and 2011 5.0 XKR
2016 Tucson 1.6T AWD
2018 Mazda2 GT

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