Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

vt/x/y/z rear brakes on vr/s solid axle

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by markovr, Dec 24, 2013.

  1. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    Ive just installed vt rear 289mm 16mm ventilated rotors on my vr solid rear axle that previously had the standard solid 289 11mm ones and you could do the same to any solid rear disc braked commodore borg warner or salisbury or even with a couple of extra parts from a disc braked vn /p/r/s you could find in any wreckers and the necessary rear axle bearings and seals installed on your axles, convert a drum braked one and it works well and it's a platform for higher end brakes too like brembo/harrop or hsv and use 315 or bigger mm discs
    This is what I did...bought some good rear hand brake shoes and vt rear calipers secondhand
    Got some old vn/p/r/s handbrake shoes and took all the friction material off them and found when assembled on the original backing plate their outside diameter was exactly the same as the inside diameter of the vt hand brake shoes...so the vt handbrake shoes slipped over the top...so I centred them on the vn/p/r/s shoes and welded them to each other in 6 places a side careful not to create too much heat and then cut them off when it was all welded so now they were 2 separate shoes like original.
    Got the vr hub backing plate and removed all the rust built up over many years by soaking it overnight in vinegar (backing plate from factory is left bare metal) and slipped the end of a bolt through the original mounting hole welded one side the cut it off and welded the other side so now the original caliper mounting holes were gone and then redrilled 2 new holes 7/16 drill size inboard at 76 mm centres, 4mm closer to the centre of the hub to fit the new vt calipers...found the standard vt caliper mounting bolts were a 12mm x 1.5 mm thread which happens to be the same thread as a wheel nut so I welded a wheelnut over each new hole , bevel side of the nut up and cut the bevel part off of the wheel nut once welded so it is flat with the rest of the nut...(found out later that I didnt need to cut the bevel off as there is plenty of room) and ran a 12 x 1.5 mm tap through the nut to tap out the thickness of metal of the backing plate and trimmed off the corners of the backing plate where the new caliper bracket touched .When i first tried to work out where to weld the new nuts on the hub I tried them the same distance as the old vr caliper mounting bolt holes but found the vt pbr caliper was too far out from the centre and the very outside edge of the pad was not contacting the 290mm disc so i had to move the mounting of the nuts inboard 4mm and it worked out perfect and everything now simply just bolts up and the handbrake works properly .Cleaned up my welds and smoothed out any sharp edges and painted it black.In time after I had a few dramas getting the nut centres in exactly the right place that if I got a longer wheelnut and ran a shoulder on it the same thickness as the backing plate and then made the hole in the plate bigger now so the barrel part of the nut was a interference fit so now I could have the caliper bolted up tight before I welded it so now the positioning was perfect everytime and it still had thread all the way through.
    When fitting up to the car I found I had to trim the dust shield a little where it made slight contact with the new caliper. I used slightly longer caliper bolts that had captured washers that originally came from front standard vz calipers to use more of the thread in the nut just to be on the safe side but the old ones would have been fine. This mod would have worked on any pre vt disc braked commodore salisbury or borg warner. Handbrake actually locks the rear wheels if you are moving (only for test purposes )and travel on the handbrake at the console is only 3-5 clicks now.


    [​IMG]
    [​IMG]
    [​IMG]

    [​IMG]

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]


    [​IMG]


    [​IMG]
    [​IMG]
     
    Last edited: Apr 22, 2015
    Cuzzy69 likes this.
  2. VPRob

    VPRob Active Member

    Messages:
    887
    Likes Received:
    53
    Trophy Points:
    28
    Joined:
    Feb 10, 2011
    Location:
    nowra, NSW
    Members Ride:
    VP executive sedan V6
    This looks like a beautiful mod. I think VP rears are exactly the same as VRs so I am thinking that this would be exactly the same process on my VP (should I ever get around to fitting an upgrade to the front).
     
  3. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    Yes they are..actually goes right back to very early disc rear commos and the 76mm stud pattern is the norm bolt up for higher end caliper/disc combinations brembo/harrop even hsv stuff...and the handbrake part is bigger and more positive...Im using a ventilated moly carbide disc as well
     
    Last edited: Apr 22, 2015
  4. VPRob

    VPRob Active Member

    Messages:
    887
    Likes Received:
    53
    Trophy Points:
    28
    Joined:
    Feb 10, 2011
    Location:
    nowra, NSW
    Members Ride:
    VP executive sedan V6
    this is so simple and clever I reckon there's a whole lot of commo drivers wondering why they didn't think of it first........
     
  5. nes138

    nes138 Member

    Messages:
    555
    Likes Received:
    2
    Trophy Points:
    18
    Joined:
    Feb 6, 2012
    Location:
    Gippsland Victoria
    Members Ride:
    FC HOLDEN with 5LT V8 (VT)
    Got a mod for the front too? (Or have I missed that one?)
     
  6. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    New fronts for my car are coming .....322 ve rda discs and ve calipers and rda extreme pads (they are a semimetallic full pad with a insulating anti squeal shim on the backing standard) with ve 18 inch wheels and just waiting for my 16s to wear out(vt calipers) qfm hpx pads
     
    Last edited: Jan 12, 2014
  7. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

    Messages:
    14,418
    Likes Received:
    2,384
    Trophy Points:
    113
    Joined:
    Apr 15, 2006
    Location:
    Sth Auck, NZ
    Members Ride:
    HSV VS Senator, VX s2 Calais S/C
    Should probably get moved into the "how to" section.

    Fairly sure the rear brakes are the same right through the Commodore range up until VS (right back to the early disk brake models).

    There are already bolt on kits to suit. VT style that really require a MC/Booster upgrade due to the larger displacement of the pistons of the VT style callipers or the later VE kits that have slightly smaller pistons in the callipers and seem to work fine with the earlier style master cylinders.

    Both styles are available with small and larger diameter rotors.
     
  8. Jxfwsf

    Jxfwsf Well-Known Member

    Messages:
    4,852
    Likes Received:
    91
    Trophy Points:
    48
    Joined:
    Feb 20, 2011
    Location:
    Aus
    Members Ride:
    commodore
    VT fronts onto a VR/VS is simple if it hasn't got ABS (live axle or irs) or has irs abs, change the hub/bearing assembly to a VT one, put on rotor and bolt on caliper.
    Need to either buy an adapter for the brake line fitting or change the flare nut to the later one and reflare it with a double flare and you're done.
     
  9. nes138

    nes138 Member

    Messages:
    555
    Likes Received:
    2
    Trophy Points:
    18
    Joined:
    Feb 6, 2012
    Location:
    Gippsland Victoria
    Members Ride:
    FC HOLDEN with 5LT V8 (VT)
    Well I have HR drum stubs with VN V8 rotors with VS calipers....
    Was hoping for a VN conversion
     
  10. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    RDA have some pretty good pads nowdays in their extreme range so I thought I'd give them a try as they are quite reasonably priced and qfm are getting exy in comparison...especially rears
    I made up a second set of shoes/hubs as per dimensions/welding above..... my car was the guinea pig and it works so well ...I drive with this setup on my car everyday...... the caliper bolt up dimensions mean you can bolt up any vt/y/z rear upgrade to fit hsv harrop or brembo with the right adapter brackets ....the whole setup is bullet proof and totally over engineered and its pretty well boltup...is anyone interested in buying the combo from me?...I can do a deal if you send me your old shoes/hubs.
    The actual setup is the same as one i saw on ebay and i have through trial and error got the positioning right and the selling point is that you can boltup brembos/hsv/ upgraded 315 discs / or harrops.
     
    Last edited: Feb 17, 2014
  11. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    Took the wheel off to check for any dramas..... all good..pads worn in...... handbrake works well .....no leaks or anything touching anything it shouldnt.
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
     
  12. Jxfwsf

    Jxfwsf Well-Known Member

    Messages:
    4,852
    Likes Received:
    91
    Trophy Points:
    48
    Joined:
    Feb 20, 2011
    Location:
    Aus
    Members Ride:
    commodore
    nice work, although looks like you need to do something about the vapor lines on the fuel tank soon.
     
  13. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    Smells a bit when I fill the tank but they are all there and the 80 litre tank has a wierd breather setup
     
  14. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    [​IMG]
    [​IMG]
    new additions....343 discs ve calipers and ss ve 18 wheels
     
  15. Cuzzy69

    Cuzzy69 New Member

    Messages:
    27
    Likes Received:
    3
    Trophy Points:
    3
    Joined:
    Aug 6, 2017
    Location:
    Vic
    Members Ride:
    Vs wagon exe v6 l67 vx
    I tried this and rear brakes are awsum. im having trouble with the hand brake adjustment! if i adjust the back just right they jam after a few turns back and forward causing them to jam on? (im NOT adjusting them to full on when i say jam.it feels like the pads are moving out of alignment once adjusted correctly)if i adjust off the rear to stop this i need full hand lever eg at max then they work with no jamming but wont hold on a steep hill. not sure why any help or has this happen to others with this conversion. i followed the full process exactly and have even trimmed the sides of the hand brake pads to no avaiil ! help please as this is a great cheap way to upgrade the rears with the front !!!!
     
  16. VPRob

    VPRob Active Member

    Messages:
    887
    Likes Received:
    53
    Trophy Points:
    28
    Joined:
    Feb 10, 2011
    Location:
    nowra, NSW
    Members Ride:
    VP executive sedan V6
    I haven't seen any new posts or responses from Marko in a while. He's a braking upgrade guru in my eyes so I hope he sees your query and responds.
     
    Cuzzy69 likes this.
  17. stick3

    stick3 Active Member

    Messages:
    740
    Likes Received:
    181
    Trophy Points:
    43
    Joined:
    Jul 29, 2008
    Location:
    newcastle nsw
    Members Ride:
    vz sedan vs ute gsx1400
    he was on here on last monday send him a pm left click on his name to start conversation
     
    Cuzzy69 likes this.
  18. markovr

    markovr Well-Known Member

    Messages:
    2,924
    Likes Received:
    92
    Trophy Points:
    48
    Joined:
    Nov 23, 2003
    Location:
    northside brisbane
    Members Ride:
    07vessv 94vr .04vz wgn,93vp wgn,82 vhV6 wgn 88 vn
    thanks for compliment

    the handbrake works in a wedge arrangement so as you apply it it moves so on the plate like most drum brake cars
    Havent had any jamming before but put up a couple of pictures of it and i might be able to help
     
    Last edited: Nov 27, 2019
  19. VPRob

    VPRob Active Member

    Messages:
    887
    Likes Received:
    53
    Trophy Points:
    28
    Joined:
    Feb 10, 2011
    Location:
    nowra, NSW
    Members Ride:
    VP executive sedan V6
    Hey Marko, I just noticed that you had an extra set made up for your rear brake upgrade that you offered for sale about 5 years ago. Did anyone ever buy that set?
     
  20. VPRob

    VPRob Active Member

    Messages:
    887
    Likes Received:
    53
    Trophy Points:
    28
    Joined:
    Feb 10, 2011
    Location:
    nowra, NSW
    Members Ride:
    VP executive sedan V6
    I was also wondering whether it might be possible/less work to start with a VT backing plate and modify that to take the earlier handbrake setup than modifying the VR hub to fit the VT calipers?
    I know I am probably over thinking this and I should probably just get a life outside my VP and Just Commodores......
     
    losh1971 and Lex like this.

Share This Page