Results 1 to 10 of 10

Thread: VS to VT 1" Master Cylinder upgrade.

  1. #1
    Fonzie's Avatar
    Fonzie is offline Just lost the game.
    Ride
    300zx 2+2 Targa

    Join Date
    Aug 2008
    Location
    Gippsland, Victoria.
    Posts
    427

    Question VS to VT 1" Master Cylinder upgrade.

    I've recently purchased some VT brake calipers, discs and pads to do an upgrade on my bog stock VS brakes, and It's been recommended to upgrade the MC too. Incidentally, Philthy has a 1" VT MC lying around that I'm pinching.

    Could someone give me a walk through of how to swap it over? Or if not, anything in particular to avoid doing?

    My assumption is undo the side bolts, drain the fluid. Undo the bolts holding it onto the booster (and i have a feeling there's one on the wheel arch too), slide it off. Bolt the new one on in reverse steps, fill up with brake fluid, and spend eighteen hours bleeding the damn brakes. How far off am I?

    Cheers, Fonzie.
    Quote Originally Posted by Philthy View Post
    ....man, I love how white your car is

  2. #2
    DannyboyDS is offline Just hand me the pliers.
    Ride
    VS Berlina

    Join Date
    Feb 2007
    Location
    Melbourne
    Posts
    2,256

  3. #3
    hako is offline Donating Member
    Ride
    VS11 BT1 V6

    Join Date
    Aug 2004
    Location
    Toowoomba SE QLD
    Posts
    7,854

    Default

    Not sure if the excellent "how-to's" include advice on bench bleeding the master cylinder before you fit - this virtually avoids the need to bleed which is very handy if you have ABS. Basically it involves mounting the new MC in the vyce and filling the reservoir with fresh brake fluid - then you attach some plastic hoses to the fluid outlets and run the ends back up to the reservoir...then pump the MC however many times it takes to fully expel air from the MC. Remove the plastic pipes just before you fit up the steel ones.
    This way you have little if any air to remove. Better explanations are found on Google.

  4. #4
    Ride
    1995 HSV Clubsport T5, 1991 VN Berlina

    Join Date
    Jun 2005
    Location
    Melbourne
    Posts
    5,036

    Default

    i think the VT M/C is bigger than 1 inch. it bolts right up to the VS booster, and if you can bench bleed it, you may not have to bleed the brakes

    1995 Manual HSV Clubsport
    Wade Cam :: 9.2:1 CR :: Pacemaker headers :: Twin 2.5" Exhaust :: VT Brakes
    1991 Supercharged VN Berlina
    9 PSI SC14 Intercooled :: Genie headers :: Twin cats :: HM Twin 2.25 exhaust :: 3.45:1 LSD




  5. #5
    Fonzie's Avatar
    Fonzie is offline Just lost the game.
    Ride
    300zx 2+2 Targa

    Join Date
    Aug 2008
    Location
    Gippsland, Victoria.
    Posts
    427

    Default

    A big cheers to DannyboyDS, Even if those links don't mention the MC I'm sure there's loads that's gonna help me when I put the brakes on. Repped you mate

    As for bench bleeding the MC, I'm not too concerned about that. For two reasons, one is I don't have ABS so it's a relatively straightforward (Albeit boring) job. And secondly, My brakes have been ratshit for as long as I've had the car, And I figured when I upgrade the brakes a full bleed couldn't do any harm.
    Quote Originally Posted by Philthy View Post
    ....man, I love how white your car is

  6. #6
    Ride
    1995 HSV Clubsport T5, 1991 VN Berlina

    Join Date
    Jun 2005
    Location
    Melbourne
    Posts
    5,036

    Default

    ah no ABS. dont have to worry about it then. i only did it to avoid doing the abs cycle thing while bleeding

    1995 Manual HSV Clubsport
    Wade Cam :: 9.2:1 CR :: Pacemaker headers :: Twin 2.5" Exhaust :: VT Brakes
    1991 Supercharged VN Berlina
    9 PSI SC14 Intercooled :: Genie headers :: Twin cats :: HM Twin 2.25 exhaust :: 3.45:1 LSD




  7. #7
    Fonzie's Avatar
    Fonzie is offline Just lost the game.
    Ride
    300zx 2+2 Targa

    Join Date
    Aug 2008
    Location
    Gippsland, Victoria.
    Posts
    427

    Default

    Yeah pov pack VS, despite the dual front airbags and a few other retarded factory fitted things.

    So was my guess on the process to install it correct?

    And, out of curiosity, what does and abs cycle bleed involve?
    Quote Originally Posted by Philthy View Post
    ....man, I love how white your car is

  8. #8
    RX25SE's Avatar
    RX25SE is offline Real cars are steel cars.
    Ride
    MY07 Liberty 30R Spec B 6sp wagon

    Join Date
    Jan 2009
    Location
    Melbourne
    Posts
    1,260

    Default

    Quote Originally Posted by stocky View Post
    i think the VT M/C is bigger than 1 inch. it bolts right up to the VS booster, and if you can bench bleed it, you may not have to bleed the brakes
    VTm/c has a 1" bore and a 1 1/8" fast fill chamber (the bit at the back that looks like the piston. VS has a 7/8" bore and a 1 1/16" fast fill chamber.

    I had to machine up a spacer to use between the m/c and booster as the pushrod was too long, even adjusted in all the way.

    I also fitted the VS reservoir to nthe VT m/c (drill and tap a new hole) so it sits level. (I would think this has been covered in the many threads on this!!)

    For a kick fit the m/c first and go for a drive with the VS calipers and discs still on. Awesome quick acting firm pedal but a little more effort required.

    You should really be flushing the system with new fluid when changing the m/c, especially with ABS, as the ABS unit has filters inside that cannot be serviced and could block if the fluid is allowed to become too dirty.
    If I told you I was a compulsive liar, would you believe me?

  9. #9
    Ride
    VS Acclaim V6

    Join Date
    Jan 2010
    Posts
    25

    Default

    yes i have also changed mine to a vt 1" m/c

    as above i had to machine a spacer up so that the pusrod wasnt permanently putting the brakes on a bit, but apart from that it was a straight forward job to install.... except for the abs unit... the whole day i could not work out how to get the air out of the abs, but left it overnight and came back the next day and the abs unit was behaving itself...

    very good pedal feel with nice and quick action. i prefer a harder less throw pedal. (running 343mm front discs)

  10. #10
    Ride
    1995 HSV Clubsport T5, 1991 VN Berlina

    Join Date
    Jun 2005
    Location
    Melbourne
    Posts
    5,036

    Default

    i remember modifying the rod. i think i screwed something into it. cant quite remember. didnt use a spacer

    1995 Manual HSV Clubsport
    Wade Cam :: 9.2:1 CR :: Pacemaker headers :: Twin 2.5" Exhaust :: VT Brakes
    1991 Supercharged VN Berlina
    9 PSI SC14 Intercooled :: Genie headers :: Twin cats :: HM Twin 2.25 exhaust :: 3.45:1 LSD





Similar Threads

  1. Master cylinder & VT Brake Upgrade kit
    By VRCITY in forum VR - VS Holden Commodore (1993 - 1997)
    Replies: 9
    Last Post: 21-07-2009, 11:37 PM
  2. 1" master cylinder
    By racer2212 in forum VN - VP Holden Commodore (1988 - 1993)
    Replies: 0
    Last Post: 11-05-2009, 09:15 PM
  3. Is this a 15/16 or 1" master cylinder ?????
    By mattakaspeeedy in forum VR - VS Holden Commodore (1993 - 1997)
    Replies: 17
    Last Post: 28-07-2008, 10:10 AM
  4. Vn-Vs 1" master cylinder and booster, Vx 1" master
    By cracker in forum Parts And Other Items For Sale
    Replies: 2
    Last Post: 20-05-2008, 07:20 PM
  5. VN/VP 1" V8 Master Cylinder
    By AlpineRaven in forum Parts And Other Items For Sale
    Replies: 5
    Last Post: 05-11-2006, 10:57 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97