The standard brakes on the M Series cars were Triumph TR6, Discs on the front with Twin Pot calipers, and Drums on the back. The brakes are ok for standard engines, but any significant increase in power and an upgrade would be a good idea. There are various options for front brake upgrades, and various price implications. The most common of these historically have been vented discs, with caliper options such as Toyota 4 Pot (cheapest option), and Wilwood Billet 4 pot calipers. Some owners have done some extra work by fitting their own desired options. Anyone wishing to submit their brake setup just drop me an email & info you want to include. 

The rear drums are pretty good as they are. In fact at MOT time I've seen the rear brakes measure almost the same perfromance as the front discs. This may not be totally normal, as there can be a few reasons for this. The two main ones being the brake bias setup, and also the rear brake cylinder bore size. There are two (correct me if i'm wrong) bore sizes available, and fitting the wrong size will in turn affect the brake bias. People have gone down their own route again for modifying the rear brakes to discs/calipers - for lightness and improved response, although some would argue this is not required except for track use or similar. 

I will cover the Wilwood brake conversion in more detail soon, as this is the setup I've used. The benefit being 4 pot lightweight calipers, that fit without fouling the standard 14" T Slot alloy wheels. Pretty sure the Toyota 4 Pots also fit under these rims as well. As for the Wolfrace (and other wheels) - let me know if you have any data on these for suitable clearance etc. 

The master cylinder is TR6 on some cars, and there have been later mods where a Ford master cylinder has been used. Haven't been through my old notes on this yet - pretty sure I have some data & info on this.