Ive just done a conversion from drums to rear discs and have found out I'll be needing a disc brake master cylinder to 1, increase the volume of fluid going to the rear brakes and 2, not hold residual pressure in the rear brake lines.
Which disc brake master cylinders are a straight bolt up? Obviously the 1" VL will but thats hardly a worthwhile upgrade. Ive heard a VS cylinder will bolt straight up but does this also apply to any other Commodore models?
Cheers fella's.
Some original photos have not been recovered yet.
Quote:
Originally Posted by Steve
You dont need a 1" Master cylinder
NA Calais' have 4 Wheel Discs and they only have 15/16 Master Cylinder...
That they do. Their also valved to allow more fluid to the rear calipers and not leave residual pressure in the rear lines to expand the wheel cylinder cups, hence why my drum master cylinder is no good for a disc rear end.
Quote:
Originally Posted by Steve
What drugs are you on
Theres no difference... I know of a few VL's with 4 wheel discs and 15/16 mc's and they have no problems at all.
Same drugs as every other man and his dog thats done the conversion and has been required to swap the M/C. Haven't driven it yet DeVL but I sure as hell dont wanna take it for a squirt then find out Ive only got 20% braking ability!!
Quote:
Originally Posted by Steve
What drugs are you on
Theres no difference... I know of a few VL's with 4 wheel discs and 15/16 mc's and they have no problems at all.
That was supposed to say I know of a few VL's Converted from drum to 4 wheel discs with the 15/16 master cylinder and they have no problems at all.
If you want to go the 1 inch just get it..
It will still work fine with the 15th/16th master...
just make sure you bleed the brakes and they should be fine...
Quote:
Originally Posted by DeVL
just drive it around the block man ur front brakes do 70% of the braking under load thats y ur front brakes are bigger
A mechanic mate of mine, a trustworthy one at that, said that as the rear calipers take a much larger volume of fluid than drum brake wheel cylinder the brake bias will be more like 90/10 rather than the usual 70/30. Because of this I'll need a M/C that sends more pressure to the rear than the current one in order to move the larger volume of fluid. Also heard this from a few other reliable sources as well.
F*ck knows. I'll bolt it up and see how it goes
Some original photos have not been recovered yet.
Quote:
Originally Posted by DeVL
if your car was turbo you would have to post this
What do you mean?
Im upgrading the brakes so I can do an RB20 conversion.
Some original photos have not been recovered yet.
Quote:
Originally Posted by PHATGM
just get a 1" master cylinder from a VN V8. $80 from a wrecker. all you need to do is slightly bend one brake line to fit it up
Yeah I might do that just to be on the safe side. How would this go with VT calipers up front?
just so u no ur mechanic mate isnt correct.
and if the mastercylinder were different like you say witch there not you would be increasing the braking power to the rear calipers because the hydralic pressure on the piston would be greater witch you cant do with this type of master cylinder and is just stupid because there is an easyer way of increasing braking power, and the size of the piston in the caliper is greater there for incresing the surface area and the pressure exzurted on the pads.
as for increasing the fluid pressure thats just stupid, the only thing i no of that changes the pressure to the rear wheels is a proportioning valve but that decreases pressure to the rear wheels.
in a hydralic braking system the fluid pressuer is the same thru-out the system so to increase braking force you increase the size of the piston witch increases the surface area pushing on the pad increasing the force.
an example ,
to double the output force of 5psi at the master cylinder to 10psi at the wheels simply use a piston with a surface area of 2 sqaure inches.
hope this helps
QUOTE=PHATGM]just get a 1" master cylinder from a VN V8. $80 from a wrecker. all you need to do is slightly bend one brake line to fit it up[/quote]
**What is wrong with you people Why would someone recommend buying a Brake Master Cylinder from a wreckers thats insane not to mention if it fails on you when you put your foot on the brakes to stop.
QUOTE Steve What drugs are you on
Theres no difference... I know of a few VL's with 4 wheel discs and 15/16 mc's and they have no problems at all.
Does anyone know what they are talking about here.The VL master cylinder has a 15/16 disc/drum master cylinder and a 1"disc/disc master cylinder.The disc/drum has a valve in the master cylinder for the rear drum brakes and the disc/disc master doesn't as it has 4 wheel discs also the crack point in the proportioning valve is different .So who is on drugs.
VLHERO : Your 1" master cyl for disc/disc which is what your mate said is correct as far as fitting VT brakes to your car i would save up and put a 330mm twin piston kit on like the VN Group A it is a @#$!load better and won't cause you any grief.
Some original photos have not been recovered yet.
Quote:
Originally Posted by LAZYASS
Does anyone know what they are talking about here.The VL master cylinder has a 15/16 disc/drum master cylinder and a 1"disc/disc master cylinder.The disc/drum has a valve in the master cylinder for the rear drum brakes and the disc/disc master doesn't as it has 4 wheel discs also the crack point in the proportioning valve is different .So who is on drugs.
VLHERO : Your 1" master cyl for disc/disc which is what your mate said is correct as far as fitting VT brakes to your car i would save up and put a 330mm twin piston kit on like the VN Group A it is a @#$!load better and won't cause you any grief.
What are you on about?
N/A Calais got discs all round with the 15/16 master cylinder. Only turbo's and V8's got the 1".
VT brakes are twin piston, and can be used with 330mm rotors.
You've obviously got no idea what your on about mate!!
