Difference between V6 and V8 brakes?

[Pav]

I was wondering what the differences between the V8 and V6 brakes were in the VP sedan? I'm asking this cos I have plans to drop a 5.0ltr in later, but at the moment I need to replace my pads and rotors and was wondering if I should just have them upgraded to V8 brakes straight away.

[azkwazere]

yes,

V8 brakes are significantly larger. Would be samrt to upgrade to either the Group A brakes or VT brake system. I reccomend twin piston setups on V6's so its mandatory on V8's afaik

aZk.

[friedchicken]

series 1 or 2? afaik series 2 vp got the bigger discs/finned calipers, so the only difference would be the 1" master cylinder, and i *think* v8 execs wouldnt have that anyway.

[AirStrike]

series 1 or 2? afaik series 2 vp got the bigger discs/finned calipers, so the only difference would be the 1" master cylinder, and i *think* v8 execs wouldnt have that anyway.

All non-ABS equipt V8's have a 1" master.

[88GreenVN]

What about the booster - isn't the V8's larger?

[azkwazere]

nope, pretty sure it was just the MC that the size channged...

aZk.

[Pav]

So, you're saying that if I have a series 1 then I need the series 2 calipers/rotors as well as the 1 inch MC? And if I have a series 2 I just need to get the 1 inch MC?

[hakhawk]

correct. you can also use vr/s v6 calipers. one hint, get the vp s2 v6/v8 ute front rotors. they are 23mm thick instead of the sedan/wagon 22mm. min thickness is 20mm, so you get an extra mm of wear for no price difference from memory. the discs are 289mm diameter i think.

dba part number is DBA 027 for the rotors.

[Pub247]

So, you're saying that if I have a series 1 then I need the series 2 calipers/rotors as well as the 1 inch MC? And if I have a series 2 I just need to get the 1 inch MC?

Yes correct vp series2 came standard with v8 spec brakes but do not have a 1inch master cylinder

[Hillerus]

Dont mess about with standard V6 or V8 brakes. They are ****. I had standard brakes on my SS and as soon as I could afford it, I put VT fronts on. They are a hell of alot better then standard. And the brakes on my V6 VP are crap. Im just glad I dont need to drive it too often.

[adam69]

All non-ABS equipt V8's have a 1" master.

no they dont.Mine had a 15/16 another one i have seen had the smaller one too.Both series one VQ V8s.I have also seen a VQ2 V6 with a 1in that is now in my car.

[hakhawk]

the v8s were probably replaced with v6 ones from a wreckers thinking they were the same thing. the vq v6 probably had been upgraded at once stage.

but from factory, they got 1"

[greenfoam]

There is a hugeeeeeeee variation in braking performance between cars with the same brakes for other reasons besides the actual stock parts. My V6 and V8 both share the exact same brake setup, everythings the same. 1 inch master V8 spec rotors and calipers BUT my VP has stronger brakes and can stop quicker than a VY or a AU falcon, I know it has a huge weight advantage over those cars but it's blindingly good on the brakes, where the V6 is ****:P clearly something is stuffed on the V6 but the point is just because your car or one certain car doesn't stop well that doesn't mean it's supposed to be like that.

My boss has an AU wagon that hardly stops at all where my mums AU is well... it could stop in under half the distance from 100 with the exact same brakes

[greenfoam]

no they dont.Mine had a 15/16 another one i have seen had the smaller one too.Both series one VQ V8s.I have also seen a VQ2 V6 with a 1in that is now in my car.

I think I read once that the utes don't have a 1 inch master? but I would have thought a VQ should have it. Anyway maybe a few sliped through with the wrong one on but they all should have a 1 inch master

[adam69]

Oh and at my mates wreckers there is a VN V8 there at the moment and it has a 15/16.

[pandaman]

There is a hugeeeeeeee variation in braking performance between cars with the same brakes for other reasons besides the actual stock parts. My V6 and V8 both share the exact same brake setup, everythings the same. 1 inch master V8 spec rotors and calipers BUT my VP has stronger brakes and can stop quicker than a VY or a AU falcon, I know it has a huge weight advantage over those cars but it's blindingly good on the brakes, where the V6 is ****:P clearly something is stuffed on the V6 but the point is just because your car or one certain car doesn't stop well that doesn't mean it's supposed to be like that.

My boss has an AU wagon that hardly stops at all where my mums AU is well... it could stop in under half the distance from 100 with the exact same brakes

Are you running the same pads on each one?

Anyway, VT brakes are good stuff, dang good value. Slight downside of being technically a little bit illegal without an engineering cert, but I've never heard of anyone getting fined/defected for having them. I'd reccomend them to anyone looking to upgrade from V6 gear. Or V8 brakes for that matter, VT's just plain kick the **** out of either of them.

[88GreenVN]

Oh and at my mates wreckers there is a VN V8 there at the moment and it has a 15/16.

The 1" M/C was probably floged and a 15/16" put in its place.

[wrx884]

r the VT brakes a straight swap over pretty much if u wanna upgrade VP V8 brakes? is there nething else u need 2 change? mayb rotors? ive got my old set from my VT i wanna put on the VP but was told i need 2 change alot and its not worth doin is this a load of ****???

[Pub247]

There's not much i think new vt rotors and the need the hubs off vr onwards commodores, calipers, some new brake lines and a vt booster and 1 inch m/c. oh and brake pads
Feel free to add or correct me if i'm wrong

[pandaman]

r the VT brakes a straight swap over pretty much if u wanna upgrade VP V8 brakes? is there nething else u need 2 change? mayb rotors? ive got my old set from my VT i wanna put on the VP but was told i need 2 change alot and its not worth doin is this a load of ****???

VT calipers and pads, VT discs, conversion hubs and fresh bearings. That's about all ya need for a front conversion.

[Morton]

These conversion hubs you speak of... are they an adaptor to make the VT calipers bolt on properly? An aftermarket item, or something you can buy from supercheap/bursons?

I think some good brakes could be my next upgrade

[Pub247]

These conversion hubs you speak of... are they an adaptor to make the VT calipers bolt on properly? An aftermarket item, or something you can buy from supercheap/bursons?

I think some good brakes could be my next upgrade

They're what the disc rotors sit on. So bearings go onto stub axle then hub then disc rotors. the VT style setup don't have the wheel studs in the rotor, they are on the hub instead

[Hillerus]

There's not much i think new vt rotors and the need the hubs off vr onwards commodores, calipers, some new brake lines and a vt booster and 1 inch m/c. oh and brake pads
Feel free to add or correct me if i'm wrong

You dont need VT booster or 1 inch master cylinder. My SS has ABS and a 15/16 master cylinder and it all works fine.

wrx884, I had to cut my backing plates to allow the calipers to fit.

Don't know whether it will help you being in Perth, but Slacks Creek Brake and Clutch here in QLD supplied my kit with everything I needed.

[pandaman]

You dont need VT booster or 1 inch master cylinder. My SS has ABS and a 15/16 master cylinder and it all works fine.

wrx884, I had to cut my backing plates to allow the calipers to fit.

Don't know whether it will help you being in Perth, but Slacks Creek Brake and Clutch here in QLD supplied my kit with everything I needed.

So you fitted rears as well yeah? Fronts are dead easy, no cutting of anything required, just a bolt on job.

These conversion hubs you speak of... are they an adaptor to make the VT calipers bolt on properly? An aftermarket item, or something you can buy from supercheap/bursons?

I think some good brakes could be my next upgrade

Conversion hubs can be bought from mr spares. (as can the whole kit) Or if you're out of your mind you can buy them from harrop for double the price. There is also the option pub24/7 brought up, you can use the hubs from a VR/VS and an adaptor ring to fit VT size discs. Alternatively again, DBA do a VT sise disc with a smaller inner diameter to fit VR/VS hubs. They'd be a special order thing though, doubt anyone would actually hold them in stock.

Really though, a VT front kit from mr spares or that other freak on ebay (can't remember who but I'm sure there was someone else selling VT kits) represents damned good value and easy fitment. The rears aren't a huge worry if you're just after better braking for everyday driving, but there are options for the rear as well, they just get a bit pricey.

[Hillerus]

So you fitted rears as well yeah? Fronts are dead easy, no cutting of anything required, just a bolt on job.

Not rears, just fronts, and as I said, I had to remove part of the backing plates for it to bolt up.