VL brake upgrade to VT

[stick3]

vb - vs used the same size pads hsv did offer a bigger brakes on the vs 328mm not sure about the vr i know what your saying losh fitting vt master and still using single piston calipers
i have read on here or other forums that the pedal is hard as a rock
better of fitting brake first of both at the same time

 

[losh1971]

Question to the OP do you have a drum rear end or disc?

 

[losh1971]

vb - vs used the same size pads hsv did offer a bigger brakes on the vs 328mm not sure about the vr i know what your saying losh fitting vt master and still using single piston calipers
i have read on here or other forums that the pedal is hard as a rock
better of fitting brake first of both at the same time

Yeah logically fitting the later calipers and rotors on the stock MC like VC Commodore did shouldn't matter all that much. In theory they would be a tad spongy but they should work just fine. But yeah going the other way and fitting the MC alone doesn't make sense from my understanding on how stopping power can not be made worse??

BTW I am not saying that I can't be wrong but it just doesn't make sense unless the booster somehow changes the physics and compensates for the larger MC. But even that seems pointless because why compensate by reducing one lot of pressure only to increase it in another way.

 

[stick3]

aussie v8 and calaistubo forums turbo http://www.calaisturbo.com.au/showthread.php?t=134762
https://www.aussiev8.com.au/bodywork-styling-wiring-sound/35949-vt-brake-upgrade-vl-questions.html
this is where i got more infomation from over the years

 

[Eat_the_poo_poo]

Thanks for the input guys. Sorry i didn't give enough details to begin with.
I have a 6cyl and i have discs all round.
From what losh1971 is saying i take it that by increasing my MC bore size i have decreased the pressure to the pads. (makes sense) by adding twin piston calipers this will be more effective. its very deceiving though as the car definitely feels like it pulls up better and the pedal is firmer.

I think i will most definitely be going twin piston VT calipers with the brake safe conversion lines, rotors, hubs, pads etc...

I am a bit weary about doing the wheel bearings because the kit i am looking at doesn't come with wheel bearings in the hubs.
Will see how we go.

Thanks guys

 

[EYY]

why would Holden put the larger bore master cylinder on their 308 and 5 litre from the factory, if it reduces braking efficiency?

They had a large steel twin diaphragm booster to go with it to reduce pedal effort. VR was the last model with this - VS is the same v6 to v8 with the plastic booster.

Vt has a stepped 1 1/4 master.

You mess with the hydraulic ratio too much and you'll need to put too much effort into the pedal. I had the VT master AND BOOSTER with the factory calipers on my vs for a little while. Braking performance was about the same but pedal was much firmer and required more pedal effort. With the stock booster, the pedal effort required to match the stock brake performance would have been incredible.

Do it once, do it right. Full VT brake setup including calipers, rotors, booster and master. Don't need to worry about the rears - they do just fine stock.

If you're not going to do the whole job, don't bother. You WILL be disappointed.

 

[Lacksballs]

My question is will I see a bigger difference on top of this mod if I was to install VT calipers, hubs, 296mm rotors, pads? (front only) ($800)


YES!

 

[Eat_the_poo_poo]

Do it once, do it right. Full VT brake setup including calipers, rotors, booster and master. Don't need to worry about the rears - they do just fine stock.

If you're not going to do the whole job, don't bother. You WILL be disappointed.



You make a clear point EYY.
Do you know if the VT twin piston calipers will bolt straight up to the VL caliper bracket??

 

[stick3]

Do it once, do it right. Full VT brake setup including calipers, rotors, booster and master. Don't need to worry about the rears - they do just fine stock.

If you're not going to do the whole job, don't bother. You WILL be disappointed.



You make a clear point EYY.
Do you know if the VT twin piston calipers will bolt straight up to the VL caliper bracket??

vt -vz calipers just bolt to the knuckle just same as what on your car now
https://forums.justcommodores.com.au/threads/how-to-vt-brake-upgrade.75831/

 

[Eat_the_poo_poo]

vt -vz calipers just bolt to the knuckle just same as what on your car now
https://forums.justcommodores.com.au/threads/how-to-vt-brake-upgrade.75831/

Thanks stick3