dylansdaddy

This may have been asked before but I cant find it. I am looking at upgrading my brakes on my sierra 4x4 to 278 from a granada cosworth, will these go straight on and can i use the existing wheels which are standard 15 inch ford alloys? All help is appreciated.

tabetha

I thought the granny cossie was still a single piston sliding caliper ?
If so 18mm larger over 4x4 discs is not going to be worthwhile imo, much better to get a 4 pot set up from a 2wd sapphy/3 door.
I have gone from the same brakes as a 4x4(front) on my xr4i, to 2wd cossie 4 pots, the difference is like night and day, when I went for std sierra 240mm to 260mm I was hard put to notice a difference it was there just tiny.
I found drilled/grooved discs made a hell of a lot more difference, as did pad material.
I recommend EBC redstuff ceramic or yellowstuff.
tabetha
tabetha

Mike Kerbey

iTrader: (1)

These will go on, but you need to use cosworth 4x4 discs. You will most likely need to drill out the caliper mounts on the hub as the bolts are a larger diameter compared to sierra. I have done it on my sierra and it was more effort than what it was worth, as tabetha said

Mike Kerbey

iTrader: (1)

and yes the 15inch wheels are fine

dylansdaddy

I know that the cossie ones are bettter but any increase on size mst be an improvement and i cant afford the daft prices that 4 pot ones seem to go for. By the way they are not cossie 15 inch wheels just standard 4x4 ones, will ither setup still fit under these cheers?????

dylansdaddy

Any help as i have someone waiting for a response?

Jimbo's Cossie

iTrader: (1)

are you chanignt he discs, if so they are 5 stud

dylansdaddy

The discs are 4 stud if off the later scorpio ultima so that is no problem.

SillyFezzaMk1

iTrader: (1)

are the 4 pot 2wd brakes actually better than the 4x4 setup? I know they have more pots but actual brake force exerted is better with the 4x4 caliper IIRC.

Cheers
Dan

dylansdaddy

Good point as the 4x4 ones are single pot why would ford go for a retro step with them?

tabetha

4 pot are vastly superior, there is more mass so they don't heat up the pads so quickly and fade as easy, they also push EVENLY.
This shows that some of the force applied at the pedal is used in nothing more than trying to overcome friction at the sliders/pins, so all not getting to caliper anyway.
Tell me the last time you did a pad change on a single piston sliding caliper on a ford and both pads were worn evenly, I've yet to see it.
Thus theoretically they should be 100% even wear, the reason they aren't is because the caliper tries to twist on the sliding pins, and effectively jams, leaving one side of the disc is p[ushed a lot harder by the pads than the other pad is pushing, result a lot easier to warp the discs as well.
The sliding pin arrangement is crap, just cheap nasty crap, but money is the point here, they were just grabbed out of a parts bin as the rest of the sierra was pretty much, but then ford are in it to make money.
tabetha

dylansdaddy

Fair point but i look after the brakes and i dont ever get uneven wear, The fade is not a issue its more the the actual stopping force which with the larger disc gives extra torque. The tiny amount of friction would be nothing when you consider the force applied to the pedal.