Roomster front brake upgrade

[kaanage]

Apart from cost and higher unpsrung weight, this is a conversion with no downsides and very clear positives.

If you've increased the unsprung mass with the larger discs and wheels, then you've also increased he rotational inertia. Do you notice overall inertia increase (rotational and basic mass) reducing acceleration and mileage?

I'm wondering how much of the benefit comes solely from the pad material rather than the leverage increase with the larger discs.

For towing and racetrack use the larger/slotted discs will certainly give more power and fade resistance but I wonder if it is any benefit for normal road usage (if not driving like a maniac/hooligan on mountain switchbacks)

[Julian Edgar]

If you've increased the unsprung mass with the larger discs and wheels, then you've also increased he rotational inertia. Do you notice overall inertia increase (rotational and basic mass) reducing acceleration and mileage?

No difference noticed. What I noticed was the change in ride quality (already had the larger wheels and lower profile tyres fitted, so it was just the change in unsprung mass from the brake swap that I am commenting on).

I'm wondering how much of the benefit comes solely from the pad material rather than the leverage increase with the larger discs.

I would expect that EBC 'Reds' would result in a higher pedal effort, not lower - so I think the extra diameter and leverage is helping here.

[kaanage]

so it was just the change in unsprung mass from the brake swap that I am commenting on.

Sure, but the larger rotors would make up most of this increase so this also increases the rotational inertia (granted, it's far smaller in diameter than the wheel rims and tyres so the increase is less for the same amount of mass added compared with these other items) and I was interested if this had any effect on non-braking performance, in retrospect.

I would expect that EBC 'Reds' would result in a higher pedal effort, not lower - so I think the extra diameter and leverage is helping here.

The EBC site says that their 'Red Ceramic' pads will

brake like an alligator right from cold (as good as Original pads or better) and just get better as they heat up

as well as

has been proven to stop a passenger car/sedan/sport compact/hot hatch 13 metres quicker than OEM pads from 100mph/160kph

so it would be interesting to compare the pads with the OE calipers/rotors IF the size was available