Jump to content


Photo

Front drum to disc conversion

74 LH S

  • Please log in to reply
10 replies to this topic

#1 Lenny Broke

Lenny Broke

    Forum Participant

  • Members
  • PipPip
  • 2 posts
  • Name:Alan O'Dea
  • Location:Adelaide SA
  • Car:1974 LH Torana S
  • Joined: 12-September 17

Posted 13 September 2017 - 08:08 AM

Hi Guys Some of you may have seen my first post in intros outline what I'd like to do to my old Dad's Torana. One of the first things I'm planning to do is upgrade from the unboosted drum brakes to a disc brake set up starting with the front and eventually all round. First up I have to admit I'm somewhat clueless about the what's available and what will be required do this conversion. I don't want to go too radical as I'm retaining the original 2850 with a few mild mods, so I'm just looking for a brake package that will cope with this set up. I was thinking along the lines of early Commodore including M/cylinder & booster.I'd also like to keep to a smaller wheel diameter 14" maybe 15" maximum. I look forward to hearing your advice and suggestions. Cheers, Alan

#2 71lc_1JZ

71lc_1JZ

    Forum Member

  • Members
  • PipPipPip
  • 122 posts
  • Name:Grant Bloxsom
  • Location:Lowood Queensland
  • Car:71 LC 4 Door
  • Joined: 13-July 15

Posted 13 September 2017 - 10:44 AM

just go the lh/lx disc set up easy bolt on or just go hooper stoper set up



#3 madtoranajzedded

madtoranajzedded

    Sir ask alot

  • Members
  • PipPipPipPipPip
  • 2,432 posts
  • Name:MAZ
  • Location:Southern Tasmania
  • Car:72 LJ SL SEDAN. 69 LC S 2 DR SEDAN
  • Joined: 30-September 13

Posted 13 September 2017 - 05:51 PM

B less mucking about if you just use the
Vh317-324 lc-lj booster and bracket.if you was
retaining the 13 dia you could use the std
booster .you wont have to fart arse about adapting the commonhore booster pushrod to
your pedalbox.you will need the firewall
brakeline and brake block and lines to
master cyl.also you have to upgrade from lc
brake cylinder on rear to lj cylinder..

roughly about 150 for std booster
bracket .it will b double that + for xu1..

You can get brake lines through Darryn Carr
on fakebook either for xu1 or std booster..

Hope this helps

Cheers maz

Edited by madtoranajzedded, 13 September 2017 - 05:52 PM.


#4 hutch

hutch

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 1,419 posts
  • Name:Phillip Hutchinson
  • Location:Irymple
  • Car:1972 LJ,2 door SL,wants to be an XU1
  • Joined: 02-November 09

Posted 13 September 2017 - 07:32 PM

I just went and brought a donor car with the disc brake front end,it all fits,just remember to use the rear brakes to suit the disc brake front end or you will have trouble

#5 S pack

S pack

    Scrivet Counter

  • Members
  • PipPipPipPipPipPipPip
  • 11,493 posts
  • Name:Dave
  • Location:Luggage Point
  • Car:73 LJ
  • Joined: 25-January 10

Posted 13 September 2017 - 10:48 PM

B less mucking about if you just use the
Vh317-324 lc-lj booster and bracket.if you was
retaining the 13 dia you could use the std
booster .you wont have to fart arse about adapting the commonhore booster pushrod to
your pedalbox.you will need the firewall
brakeline and brake block and lines to
master cyl.also you have to upgrade from lc
brake cylinder on rear to lj cylinder..

roughly about 150 for std booster
bracket .it will b double that + for xu1..

You can get brake lines through Darryn Carr
on fakebook either for xu1 or std booster..

Hope this helps

Cheers maz

Ahhhhhhh Maz, it's an LH Torana.

 

Cheers

Dave.



#6 madtoranajzedded

madtoranajzedded

    Sir ask alot

  • Members
  • PipPipPipPipPip
  • 2,432 posts
  • Name:MAZ
  • Location:Southern Tasmania
  • Car:72 LJ SL SEDAN. 69 LC S 2 DR SEDAN
  • Joined: 30-September 13

Posted 14 September 2017 - 12:01 AM

😨 My bad .Crawls back under rock

#7 Dr Terry

Dr Terry

    Technical + Numbers Guru + Moderator

  • Moderators
  • PipPipPipPipPipPip
  • 2,658 posts
  • Location:Eastwood (Sydney) NSW
  • Joined: 13-November 05

Posted 15 September 2017 - 02:01 PM

I just went and brought a donor car with the disc brake front end,it all fits,just remember to use the rear brakes to suit the disc brake front end or you will have trouble

For LH/LX/UC the rear brakes are the same for both disc brake & drum brake cars.

 

The 3 main changes for drum to disc (other than the front brakes themselves) are the proportioning valve, master cyl & booster.

 

Dr Terry



#8 madtoranajzedded

madtoranajzedded

    Sir ask alot

  • Members
  • PipPipPipPipPip
  • 2,432 posts
  • Name:MAZ
  • Location:Southern Tasmania
  • Car:72 LJ SL SEDAN. 69 LC S 2 DR SEDAN
  • Joined: 30-September 13

Posted 15 September 2017 - 07:11 PM

Seems its drum does it have a brake fail
wire incorperated into the loom..

#9 gear_head69

gear_head69

    Forum Participant

  • Members
  • PipPip
  • 5 posts
  • Name:Jack Penno
  • Location:Renmark S.A
  • Car:74 LH Torana
  • Joined: 03-October 13

Posted 05 March 2018 - 08:41 PM

Can a PBR vh246 booster be used for a front disc conversion?

#10 Muzzy

Muzzy

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 641 posts
  • Name:Brian
  • Location:Dubbo
  • Car:LH Gran pa special
  • Joined: 29-October 13

Posted 06 March 2018 - 07:03 PM

I have done this conversion on my LH
You will need
New stub axles, ( the old stub axles are worth a bit, as they are used in big brake conversion)
Front calipers, rotors and hoses
Straight shaft ( push rod) booster, ( you have to drill the firewall , however the dimples are there as guides)
Master cylinder with out residual line pressure valve
The brakes line into the master cylinder are also swapped around ( IE front to back)
I never fitted a pressure limiting valve, it has passed rego and doesn’t suffer from rear wheel lockup)

#11 LHSL

LHSL

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 947 posts
  • Name:Phillip
  • Location:SYDNEY
  • Car:1974 LH SL; 2 x 1975 LH S Toranas
  • Joined: 30-March 07

Posted 06 March 2018 - 09:14 PM

I also had to change my front brake lines. They used to run down the front rails Now they run the centre of the inner arches.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users