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Old 2 Weeks Ago   #16
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Re: Disc Brake Mod??

Haha! My car has front and rear discs , braided hoses and an upgraded master cylinder! On its nose indeed!
I have not investigated pad materials / makes yet - but am aware of the huge differences to braking they can bring.
My calipers are all Fiat - so should be able to choose later
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Old 2 Weeks Ago   #17
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Re: Disc Brake Mod??

Been burning the midnight oil of late, with plenty of research into Disc pad materials and applications. All I can now say is that it's a damn nightmare After a considerable amount of time I can quote from an initial ten differing pad makers with a range of OEM replacement, fast road and race applications But, it does seem that with a little patience and logic one can arrive at some sort of initial conclusion prior to actual testing of individual pads on the car
For the most part, OEM brake pads are equipped with a .3 or .4 friction coefficient while performance brake pads are equipped with a .4 or .5 friction coefficient. More modern ceramic brakes on an F1 car might have an even higher level depending on the requirement at the time. I have found a small example on the web that relates to the lotus elise (see chart)

Friction Levels
Mintex M1144 Mintex F6R Pagid RS14 Pagid RS 15
Cold 0.44 0.28 0.44 0.50
At 100C 0.45 0.28 0.47 0.57
At 300C 0.46 0.28 0.49 0.54
Max 0.46 0.40 0.54 0.62
Constant working temperature
100–500C 100-800C 400–800C 400–800C
Max temperature for short period only
500C 800C 800C 900C

You can see that the Mintex M1144 from cold maintains almost a constant coefficient to 500C but above the max temp they will start to break up. It should be noted that the Lotus is a heavier car at some 725kg against the 500 at some 560kg (max) and the 126 at 580kg the breaking effort and thus the temperature required to maintain high braking levels with some pads can only come with a racing application. There are many pads that will not be road legal and meet the ECE R90 certification, but it seems that for a fast road application with good cold 'bite' and constant friction levels (in a lightweight car) that the Mintex 1144, Pagid RS14 and Ferodo DS2500 are worth testing. Other factors can and will effect braking efficiency - Caliper, Rotor and brake fluid boiling point. While noise and dust debris will be secondary they matter too. Before I get to the thorny issue of my choice I need to determine how my brakes will operate with standard OEM pads fitted and the replacement of the rubber pipes with good quality braided items (Bfgoodridge) this may tip the balance toward a slightly more aggressive OEM replacement rather than a fast road choice. Also, I must consider that my front brakes came from a Fiat application (131) that weighed 950kg - not far off double that of the 500 and that my Rotors have been reduced in size to 200mm. I'll service the callipers and once I've tested the new pipes I'll get back.

Ian.
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Last edited by Bleeding Knuckles; 2 Weeks Ago at 21:43.
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Old 2 Weeks Ago   #18
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Re: Disc Brake Mod??

New braided pipes are on - a bit of a faff on the rear left I had to remove both short metal pipes and the flexi pipe from the three way block as the union was starting to round off a bit of application with the vice helped!!!! Have noted that the front pads are GALFER 139 FF ???? Anyone heard of this company, they seem to be Spanish with quite a large catalogue???? Produce a lot of sintered pads, but I don't seem to be able to identify my number??? back later.

Ian.
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Old 2 Weeks Ago   #19
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Re: Disc Brake Mod??

What calipers are you running Ian?
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Old 2 Weeks Ago   #20
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Re: Disc Brake Mod??

Quote Originally Posted by AndrewHarvey View Post
What calipers are you running Ian?
Hi Andrew, mine are from the X1/9, 128, 131 series using a Bendix 48mm piston, the body of the caliper has been reduced for wheel clearance, (see pic earlier) but with my wheels there is plenty of room so maybe it was done for 10" wheels?????

Ian.
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Old 2 Weeks Ago   #21
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Re: Disc Brake Mod??

I run very dished Borranni steel wheels that run incredibly close to my calipers - so maybe this is why "adjustments" have been made to your calipers?
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Old 1 Week Ago   #22
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Re: Disc Brake Mod??

I'm trying to fit discs to my 500.
I don't want to buy a kit as I prefer to do my own work even if it does cause a number of headaches!

Finding a caliper which will fit under the 12" wheels is proving tricky. I understand a mk1 / mk2 fiesta caliper will fit, but they're a bit tricky t get a hold of. I'm looking towards small pre 2000 Japanese vehicles for some inspiration. I'm hoping to find a set from a suzuki alto to see if they will fit.

I've also been looking into motorbike calipers. Fixed calipers with opposed pistons are too wide. I've found few types of floating calipers which may work. One advantage is twin pistons. 2 x small pistons is shorter than 1 x large piston. Motorbike discs are generally too thin but there are a few exceptions. I have a set on their way to me which I'm hoping will fit into the wheel.

If anyone has any caliper suggestions I will happily take any advice!
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Old 1 Week Ago   #23
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Re: Disc Brake Mod??

Fiat cinquecento calipers are used along with Fiat punto ones...
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Old 1 Week Ago   #24
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Re: Disc Brake Mod??

Quote Originally Posted by MOD500 View Post
I'm trying to fit discs to my 500.
I don't want to buy a kit as I prefer to do my own work even if it does cause a number of headaches!

Finding a caliper which will fit under the 12" wheels is proving tricky. I understand a mk1 / mk2 fiesta caliper will fit, but they're a bit tricky t get a hold of. I'm looking towards small pre 2000 Japanese vehicles for some inspiration. I'm hoping to find a set from a suzuki alto to see if they will fit.

I've also been looking into motorbike calipers. Fixed calipers with opposed pistons are too wide. I've found few types of floating calipers which may work. One advantage is twin pistons. 2 x small pistons is shorter than 1 x large piston. Motorbike discs are generally too thin but there are a few exceptions. I have a set on their way to me which I'm hoping will fit into the wheel.

If anyone has any caliper suggestions I will happily take any advice!
Hi Mod, If you check back through this thread it will show you what I have fitted and give you the details, all parts are available.
Ian.
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Old 1 Week Ago   #25
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Hi Ian,
I read through a few times before posting. Your calipers are fiat X19 family but I understand they have been modified to fit. I would like to find a caliper that doesn't need to be modified. (I guess I'm looking for the moon on a stick!)

I've managed to find some brake disc catalogues which allowed me to narrow my search down to a few caliper types, but so far I've been unable to find a catalogue of calipers to compare dimensions.

Cheers,

Michael
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