[rdorman]

I have a pair of four pot Girling/Jag calipers with EBC greenstuff pads that are for sale so yes, they are available.

Can you ever lock all four wheels and if so which lock first? Look up the other recent thread where I was trying to help Clois with some of his issues.

Before you go and buy new front brakes you are going to have to work through some items. It sounds to me as though you can not generate enough braking power to stop the car. Aside from changing thing that you really don't want to mess with, your options to increase brake torque include:
- for mechanical advantage you have larger rotors or higher ratio peddles
- Smaller master cylinder bore, higher CF pads, larger caliper pistons (and or more of them)

Things to keep in mind:
- you don't want to mess up the balance. sounds as though you do not have a balance bar set up so you need to be able to lock all four wheels, with no proportioning valve the rears need to lock right after the fronts. otherwise you will need to add a proportioning valve.
- if you increase the CF of your current pads, once again you may have a balance issue if each end is not increased similarly
- if you go to a smaller bore master cylinder then you will increase peddle travel and in extreme cases can exceed the working pressure of the rest of the system (unlikely). higher ratio peddles will basically do the same thing
- you don't say what size rotors you have on the front nor the wheel size but if you are running 15" rims then 12.19 is going to be your max. and that is a maybe.
- you want to shoot for about 75 pounds of peddle pressure to achieve lockup with minimum travel. 75 is easy to do (put a bath scale against a wall with your back to another wall or really heavy piece of furniture and push on the scale, you will see what is comfortable for you)

If you can give me some information then I can make some basic recommendations that will help guide your shopping: rolling diameter of the tires, brand and model of tire, front and rear weight, lever ration of current peddles, master cylinder bore size front and rear, number of caliper pistons, size and how they are mounted (floating or fixed), rotor diameter, pad information specifically brand, model and CF. Some of this information I can do without and assume the part will be replaced, like the pads, some I can not!

First impression is larger rotors for the front (more heat so they will fade quicker than the rear, you can keep what you have but be aware that this will happen), smaller master cylinder (larger calipers) or if you are happy with the amount of travel you have, new higher CF pads. On the pads be aware that above .5CF it is almost impossible to find a pad that is not really dusty.

I have adapted Wilwood to fit MG front ends, I see no reason why it can't be done for Jag. My car had the same issues that yours did, not any more!

Rick