mk3 rear brakes update

Discussion in 'Capri Chit Chat' started by Javier Rubio, 17 July 2020.

  1. Javier Rubio

    Javier Rubio Established Member Capri Power Member

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    Hi, I'm turning to rear axle discs, Sierra calipers, Fiesta discs, Scorpio cable (I think it's like in Sierra but longer). Now the question, it seems to me that the cable is very short keeping the original support (I will put parallel the other is missing), I can still modify the position of the clamps (I have not soldered the support and I can manufacture another one). I do not see any photos of how other people placed the wire (from an Escort in google but from Capri neither in this forum nor anywhere), does anyone have any photos to show me?

    01.jpg 02.jpg
     
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  2. 2.8jonny

    2.8jonny Registered Capri Power Member

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    I ran cable ties holding the cable to the axle for years and on the last overhaul fabricated and welded on brackets. Cable length can be altered slightly by varying the length of the link at the hand brake end. I also welded the second bracket opposite the original in the tunnel.

    Jon
     
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  3. mgentry90

    mgentry90 Registered Capri Power Member

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    I cable tied mine to axle also, quick and easy.

    I bought one of the bolt on brackets for the tunnel
     
  4. Javier Rubio

    Javier Rubio Established Member Capri Power Member

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    The cuestión was, model A ir model B?
    A 1595032157323..jpg

    A
    1595032756794..jpg

    B
    1595033027910..jpg

    Finally I decided B, the cable has more Liberty to move
     
    Last edited by a moderator: 18 July 2020
  5. Javier Rubio

    Javier Rubio Established Member Capri Power Member

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    Finally I rotated the plate 45° (new one), now only screws match two instead of three but the position is correct for the Hand brake cable. I cant upload photos from muy mobile, maybe another day
     
  6. eau de cologne

    eau de cologne Registered Capri Power Member

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    Be sure to use stainless cable ties some extra security can be added to them by twisting the tab. As for the best position I think as straight a possible for the last 5 - cm's or as least a nice radius with model B, I'm in the fortunate position of having a company just round the corner from me to lengthen or shorten the cable.

    Bert
     
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  7. Javier Rubio

    Javier Rubio Established Member Capri Power Member

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    finally I installed it like this, welding the bracket to 00.jpg 01.jpg 02.jpg 03.jpg 04.jpg 05.jpg 06.jpg the shaft
     
  8. eau de cologne

    eau de cologne Registered Capri Power Member

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    Looks about right, how did you handle the additional cable length?.

    Bert
     
  9. Javier Rubio

    Javier Rubio Established Member Capri Power Member

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    Hello Bert, at the moment I have placed a support like the original on the other side, I have cut the original cable and I have tied it provisionally, and I have made another one from the handbrake to said cable. It is provisional but it works, I have not found any for sale that would be worth 2.8. Now I have to disassemble it and look for a store that will make me one with these measurements
     
  10. tecb

    tecb Registered Capri Power Member

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    As my current system doesn't have a handbrake, and single cable operated handbrake calipers seem impossible to get hold of, I'm considering cosworth rear calipers. Thing is I'm using 20mm thick vented disc's, is that to big for the calipers?
     
  11. eau de cologne

    eau de cologne Registered Capri Power Member

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    Sierra and Cosworth calipers are identical, as placed on the Sierra Cosworth car, you use Fiesta discs because you don't want to out perform the front braking system by no near margin, not likely but possible.

    Bert
     
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  12. caprimk3

    caprimk3 Richard Capri Power Member

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    Cosworth Sapphire 4x4 and 92-94 Escort Cosworth uses vented rear disc's so use calipers listed for those.
    I belive 95- Scorpio Cosworth also used the same caliper. Scorpio have listed the caliper as 20mm.
    Vented disc do not brake better, they just cool down faster due the ribbs in between the two disc surfaces.
    It is the size of disc, position of caliper from center point of axle, caliper piston size(s) and pads materials that determs the force of brake.
    As long as rear brakes is a tad smaller than the front, it should work without problems.
    Mondeo Mk3 for example has 300mm disc up front and 280mm at rear with 57mm single piston up front and 38 piston at rear, both of sliding type (wanders on some sliding pins).
    Master cylinder on a Mk3 Mondeo is 23.8mm

    A normal car has the front brakes doing 70% ish of the work.
    This is because a normal car is runnig a soft is suspension so when you brake the front end will dive.
    And because of that the rear brakes is constructed to only 30% of the work as the rear end will get lighter under braking, and have more brake available may break the rear end loose, you don't want that as locking rear brakes on a wet road will turn bad very rapidly.

    But with that said, stiffer cars, like road racing may go bigger in the rear as the weight transfer at braking is not a big as a normal car with soft supension.
    250mph road/race cars like those attending the Silver State Challenge and have lets say 14" disc up fron and 13" in the rear with 8 piston calipers up front and 6 piston in the rear.
    At 200mph you want a car to brake as flat and steady as possible.
    Diving front end is no good at those speeds.

    Also a test done in NZ with a heavy loaded car in the rear (in that test they did fit lowering springs at rear and kept the standard front springs) and that triggered the bias valve and that really set up the brakes.
    The test people did not concider the bias valve one bit, they only showed a lowered car was the problem.
    But clarly the bias valve was tilted so badly backwards it triggered the bias valve and they lost front brakes.
    For that reason I have never liked those bias valves as fitted to 2.8i, as they can get upset if the front or rear is lower than the the other part.
    I will rather drive with big rear brakes than with one of those valves fitted.
    And as I said, a lowered/stiffer car will not shift as much weigth forward under braking as a standard car, so you can run bigger brakes in the rear than if the the car was standard, without problems.
    And I have never seen a modified car lock the rear brakes before the front.

    But to pass a modified approval test, they do use a brake calculator to see if your brakes has the correct % front to rear.
    As with any modifications, you car should go through a approval that says your car is legal to drive.
    Here in Norway all modified cars have to get through a approval to legaly be on the road.
    And now your car won't pass a MOT if it has no approval.
    Every second year we have to get throught MOT to have the car legal to drive.


    Regarding the cables.
    You could make a triangle piece of say 4mm steel plate, weld on a rod to the handbrake and attach the cables from the caliper to the triangle thingy.
    That way only one connection the the handbrake but both cables can be fitted together.
    Mondeo Mk3 for example have a bracket with a cable in the end that connects to the handbrake and the cable ends slots into two grooves in that horseshoe thingy.
    Mk3 have a few variants of that cable connector, mine was fitted with one as seen to the left.
    It has a nut at the end so you can tighthen the cables.
    Mk3-handbrake_handle_2.jpg
     
    Last edited: 17 September 2020
  13. Javier Rubio

    Javier Rubio Established Member Capri Power Member

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    Scorpio BOB calipers are like Sierra but they use vented disks (have a little more space to use vented disks, rest is the same)
     
    tecb likes this.
  14. tecb

    tecb Registered Capri Power Member

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    Thank you all for your imput. Now sourced a pair of mechancal calipers.
     

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