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.

Disc brake conv.

Discussion in 'The Garage' started by 85 blazer, May 30, 2004.

  1. 85 blazer

    85 blazer 1/2 ton status

    Joined:
    Feb 12, 2002
    Posts:
    118
    Likes Received:
    0
    Location:
    Avoca NY
    I recently did a rear disc conv. new everything except master cylinder and prop valve 100% bled out and it seems my rears hardly do anything I have read posts about locking up but mine feels as if the rear barely works, can the prop valve be bypassed for the rear? or is there another fix for this Thanks Frank
     
  2. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    You bypass the stock prop valve by putting in a manual prop valve /forums/images/graemlins/thumb.gif
     
  3. jimmyjack

    jimmyjack 1/2 ton status

    Joined:
    May 11, 2000
    Posts:
    2,290
    Likes Received:
    0
    Location:
    Tucson Az
    When I did my conversion I didn't have to do ANY mods to make them work differently. My brakes have never locked up, but when you lock up brakes you're not really stopping either /forums/images/graemlins/dunno.gif My buddy Don had nothing but probs, biggest thing was bleeding them, we would work for hours and go through qts of brake fluid. Turned out the calipers were on upside down. /forums/images/graemlins/doah.gif The fluid would flow into the caliper and drain right out the bleeder screw. No air bubbles or anything, just good clear fluid. ended up the resovoir never even filled up. So make sure the bleeder screws are on top of the caliper. In the end we put the left caliper on the right side and the right caliper on the left side. Stops like a champ now! Good luck, I hope it's this simple for you.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    Depending on what calipers you are using (caddy in particular) you've got to make sure they are adjusted enough so they are actually gripping the rotor.
     
  5. Triaged

    Triaged 1/2 ton status

    Joined:
    Feb 21, 2001
    Posts:
    3,808
    Likes Received:
    0
    Location:
    CA (LA/OC area)
    To get full pressure from the rear unbolt the rear part (where the line for the rear brakes attach!) of the combo valve and take the spring out and put it all back together as it came out. You will then have full pressure to the rear brakes...which might be too much.
     
  6. 85 blazer

    85 blazer 1/2 ton status

    Joined:
    Feb 12, 2002
    Posts:
    118
    Likes Received:
    0
    Location:
    Avoca NY
    I put ona master cyl from an 85 3/4 ton pickup helped with the pedal, but now i need 1 new caliper the right side wont release, did stop better however but still not like i expected, the calipers are mounted with the bleeders in the up pos. Thanks Frank
     
  7. jwduke

    jwduke 1/2 ton status

    Joined:
    Aug 25, 2001
    Posts:
    721
    Likes Received:
    0
    Location:
    Ice Cream Capital of the World, IA.
    I used a proportioning valve from a '81 Corvette, plus I made the rod between the brake pedal & the master cylinder adjustable, these 2 things cured my problems.
     
  8. 85 blazer

    85 blazer 1/2 ton status

    Joined:
    Feb 12, 2002
    Posts:
    118
    Likes Received:
    0
    Location:
    Avoca NY
    Are the lines the same from your truck to the vette? I have a parts vette behind my garage!!!
     

Share This Page