Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

In need of info on rear disc convertion

Discussion in 'The Garage' started by 4wheelattitude, Sep 20, 2005.

  1. 4wheelattitude

    4wheelattitude 1/2 ton status

    Joined:
    Aug 5, 2005
    Posts:
    145
    Likes Received:
    0
    Location:
    central Illinois
    I thinking about doing the rear disc convertion on my 1970 GMC shortbed. I'm not sure about the prop valve issue? Could I just go to the local salvage yard a get everything I need for this with exception to the mounting plates?
     
  2. shane74

    shane74 1/2 ton status

    Joined:
    Feb 12, 2002
    Posts:
    4,100
    Likes Received:
    0
    Location:
    Vancouver, WA
    Some trucks need a prop valve, some don't. I don't recommend installing them until AFTER you have done the swap. AFA using junk yard parts, I wouldn't. Brakes aren't something you want to mess with.
     
  3. 4wheelattitude

    4wheelattitude 1/2 ton status

    Joined:
    Aug 5, 2005
    Posts:
    145
    Likes Received:
    0
    Location:
    central Illinois
    Would it be worth the effort to do the rear brake covertion?
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

    Joined:
    Nov 1, 2004
    Posts:
    25,552
    Likes Received:
    546
    Location:
    horseheads , ny 14845
    my one ton with 6500 lbs of weight and 38 tires stoped good with disk / big 13" drum. then swaped to disk in rear. wont ever ever go back stop on a dime. and no more major panic stops also from dumb drivers.:D


    i like disk rear so much that shane74 is helping me with a project to convert a nother custom setup.:D
     
  5. sandawgk5

    sandawgk5 3/4 ton status

    Joined:
    Oct 28, 2003
    Posts:
    6,881
    Likes Received:
    1
    Location:
    Kitsap County PACNORWEST
    :eek1: :eek1: :eek1: :haha: :haha: :doah:

    Ira
     
  6. sweetk30

    sweetk30 professional hooker Premium Member

    Joined:
    Nov 1, 2004
    Posts:
    25,552
    Likes Received:
    546
    Location:
    horseheads , ny 14845
    stop it sailer thats not funny:D :p: :wink1:
     
  7. ntaj*ep

    ntaj*ep 1/2 ton status

    Joined:
    Feb 4, 2002
    Posts:
    3,248
    Likes Received:
    1
    Location:
    Evergreen state
    On the system you have if you go with a master/power booster from a K20-30 or I think the Subs also had the same units. You will be set, prop valve shouldn't be an issue.
     
  8. Beast388

    Beast388 1/2 ton status

    Joined:
    Nov 6, 2001
    Posts:
    3,039
    Likes Received:
    0
    Location:
    Clinton, IA USA
    A 1970 GMC would have drums at all corners so I guess if it were me I'd get a prop valve from a vehicle that was at least disc/drums.

    I assume you have already swapped the front to discs?

    For what its worth, I am using the stock MC, booster and prop valve on my 71 GMC with 4-wheel discs and my Burb stops quite well. :D
     
  9. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

    Joined:
    Dec 15, 2002
    Posts:
    15,142
    Likes Received:
    572
    Location:
    Iowa

    In my opinion its one of the best upgrades out there when done correctly. Like said above some need to mess with the prop. valve and some don't. So far I have been lucky. I've installed about 7 of these now and never needed to do anything more than have them power bled. Get that done and the pedal feels like a rock!
     
  10. 4wheelattitude

    4wheelattitude 1/2 ton status

    Joined:
    Aug 5, 2005
    Posts:
    145
    Likes Received:
    0
    Location:
    central Illinois
    Yup! I did switch the front disc some time ago. However I never did put a power brake booster on the truck. It takes some fancy foot work to slow her down sometimes. I've got it in the garage putting the 700r4 in now. While it's there it's going to get power 4 wheel POWER disk brakes, new rears, rebuilt transfer case, factory a/c, 33" tires, 4" lift, factory tinted windows, new bumpers, and really sweet pain job. Just keep it quiet the wife dosen't know yet! :D ;) Thanks for all the help.
     
  11. 86chevybanshee

    86chevybanshee 1/2 ton status

    Joined:
    May 15, 2004
    Posts:
    917
    Likes Received:
    0
    Location:
    beverly MA
    rear disks are well worth it, i just recently put them on my truck, i used the stock prop. valve, i need a new master tho, mines not getting full rear stopping power.
     
  12. RootBreaker

    RootBreaker 3/4 ton status Premium Member

    Joined:
    Nov 29, 2001
    Posts:
    5,118
    Likes Received:
    173
    Location:
    Williamstown, NJ USA
    when I had drums... I was going down the road and someone cut me off.. .I hit the brakes and the ass end flew out from under me to about a 25 degree angle.... should have seen their faces when they heard 40x17 hawgs barking on the road..... :haha:
    scared me though.... so I had the parts for the rear disc swap but just didnt do it... waited until after inspection...

    then I did the rear disc swap... I can hit the brakes hard now and she dont do that now.. more controleable... I may have had the rear drums adjusted too much or something but I love the rear disc... also easier to change the brakes now.. plus funny when people look at it and say .. .that is a 70's truck right???? :haha:

    I say yes.. and they :bow:
     

Share This Page