Probably a stupid question, but here goes...

Brembo 4 pot,
Bolthole centres 90mm
Piston diameter 30mm
Designed for 30mm thick & 305 diameter discs

Fit a 2wd cossie on 17's (BK's) ?

Would there be much benefit over standard calipers ?

 

if there same as these there is a big difference. And you can you use 325mm disc's with them or 335 with right discs.

 

Do you happen to know the bolthole centre measurement for yours ?
Were they a straight fit, or did you need adaptors made up ?

 

Sorry no it was a kit from Godspeed Brakes and comes with all brackets etc.

 

what benefits are you looking for greg?

feel, resistance to fade, etc?

personally, i see no advantage from the caliper change. i have the original 4 pots on mine on 330mm discs and there is a huge improvement in terms of resistance against fade over std size discs whilst keeping a good pedal feel.

 

Better braking really, but I don't want to spend £1000's. Saw those calipers up for sale at a keen price, and it got me wondering...

Are you saying you can change disc size whilst retaining the original calipers ? Will this increase the pad/disc contact area, or merely reduce fade ?
Now I am interested...

PS: I know safety has no price, but I can't afford the best kits out there, so any improvement for a relatively small outlay would be great.

 

what do you mean by better braking though?

what is the problem with your current brakes, that makes you think that you need different / bigger ones?

it may not be brake related at all, or could be easily solved with a change of fluid or pads for example.

to answer your question, yes of course you can use the same calipers on a bigger disc, as i have on my 330's. the pad area may not be perfectly matched to the inner and outer radii of the larger disc, but generally the whole pad area will be covered. the advantage is that as the disc has a larger surface area, it can dissipate the heat quicker and resist fade. my 330's are also much thicker than std discs, which also helps.

to do so, you need to space the caliper further out, and make sure that it will clear the wheels. the std calipers are quite large compared to brembo, AP etc, so there is a bit of a disadvantage there. i made up my brackets myself as they needed to go further out from the strut, and further out from the centre of the car (depending on the rotor bells). I also made thicker spacers between the 2 caliper halfs for the thicker discs.

as the pistons in the caliper are matched to the master cylinder, you keep the same pedal feel. if you went to a caliper with a smaller overall piston area, your brake pedal would need to travel less to get the same clamping force, and vice versa with ones with a larger overall piston area (maybe 6 or 8 pots or whatever).

 

I want it to stop quicker

No problem as such, it's just that the standard setup is allegedly ok for stg 3 power, but I'd like to know I have a little headroom rather than being "borderline".

Running Ferrodo DS2500's already