fitted 330mm disc's with ap 4 pot caliper's and the brake's are
great but the car goes very light on the rear and tries to step out
under hardish braking any idea's how to cure this please

thanks in advance

 

If it wasn't happening on standard brakes it's probably not really rear becoming light but incorrect brake balance. Try tweaking with different rear pads.


Dos it lock rear before the fronts?

 

no, just goes light and try's to go sideway's so you have to steer in to it
can be scary

 

It wasnt doing it before brake upgrade? Quite impossible....


I would think about lowering back end a bit a bit then, maybe stiffer front end suspention hmmm...

 

does sound like a plan as the the front does nose dive and feel's like the rear lift's will have a play with the shock setting's and see what happen's

 

Shocks themselves won't help I'm afraid. It's rather in spring rates.

 

Try re bleeding the system

 

in simple terms your front suspension is too soft

 

what lb springs are you running on both the front and the back?

 

could slip a set of coil overs on there then you can adjust them to how you want. it could have been doing it before but not as much then wen you uprated the brakes they are now working a lot better so you notice it a lot more now

 

-bad Bleed And Or Also Needs Bias Valve--------
Forget Springs Etc Etc------it Wasnt Like This Before Brake Change Was It????
Must Be The Brakes Then!!!!!!!!!!!!! Try Changing Pads!!--lol At Around £50-£60 Plus How Many Sets To Get It Right Do You Think-------????lol
I Can Send You Six Sets That Wont Make A Bit Of Difference!!!!!!!!!!!!!!!
Paypal Me £360 Now Thanks And The Same Every Month Till We Get It Something Like---------------pads!-o'er

 

it wasnt like it before but were the brakes as good as they are on the front now since the upgrade, he has done a big upgrade on the brakes from standard so it will change it a lot

 

sounds like you need a bias/proportioning valve !! i had the same problem. are the rears locking up and just trying to slide out??