You have bleed nipples on your caliper as distinct from the simple screws which are often fitted.
The bleed nipples have a conical end which seats against a machined taper in the caliper body, no gasket.
If you go to www.kartstore.co.uk you will find an illustration of the nipple under SKM brakes.They say it has a 6mm. thread.
If you raise the back of the kart so that the bleed nipple is at the highest point you can take it out and replace on your system without losing fluid.
Since one nipple has already sheared off you need to be careful to avoid shearing the good one.
Getting the broken one out is likely to be difficult. Heat should help but will really involve splitting the caliper and removing the rubber seals.
If you have a good firm pedal you may choose to ‘live with it’
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