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  1. #11
    Off the Xmas card list kapri's Avatar
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    Your master cylinder is too small , minimum you need to work that set up is 7/8 aka 22.2 .As already stated by Gary, you'll have a high pedal but even less stopping power . I'm presuming you are single circuit still so you'll need a remote servo as well.

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    Yes it's a single circuit and does have a remote servo. The current master is quite a tight fit, is a 7/8" physically bigger or is it just the bore size?

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    Also make sure the rear calipers are mounted as per original orientation, it is possible for an air pocket to remain even though the bleed nipple appears to be at the top due to the shape of the internal fluid chamber of the caliper.
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    thinking about whats standard on escorts, say mk 1 19mm/3/4" master cyl with front discs rear drums adding the rear discs will require more fluid to move the calipers than the tiny drum brake slave cyls so as has been said up the diameter of the master cyl to 7/8 or even 1" / 25mm which will shift more fluid per amount of pedal movement, yes the effort is more but fitted 1" in a kit where a 3/4 had been before without a servo and although it was heavier press hard and it would lock up working on area I seem to remember 67% greater area which isn't twice as much so not a huge difference. in the case of my escort based kit car a transit 1" had the same exterior dimentions as the escort 3/4" except the stud spacing was narrower by a couple off mm.

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    Quote Originally Posted by drseg View Post
    thinking about whats standard on escorts, say mk 1 19mm/3/4" master cyl with front discs rear drums adding the rear discs will require more fluid to move the calipers than the tiny drum brake slave cyls so as has been said up the diameter of the master cyl to 7/8 or even 1" / 25mm which will shift more fluid per amount of pedal movement, yes the effort is more but fitted 1" in a kit where a 3/4 had been before without a servo and although it was heavier press hard and it would lock up working on area I seem to remember 67% greater area which isn't twice as much so not a huge difference. in the case of my escort based kit car a transit 1" had the same exterior dimentions as the escort 3/4" except the stud spacing was narrower by a couple off mm.
    Righto, what car would have had 7/8" master?

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    Quote Originally Posted by chrisvs View Post
    Also make sure the rear calipers are mounted as per original orientation, it is possible for an air pocket to remain even though the bleed nipple appears to be at the top due to the shape of the internal fluid chamber of the caliper.
    When we bled the rears we rotated the calipers to get the bleed valve at the top

  9. #17
    Off the Xmas card list kapri's Avatar
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    Quote Originally Posted by drseg View Post
    thinking about whats standard on escorts, say mk 1 19mm/3/4" master cyl with front discs rear drums adding the rear discs will require more fluid to move the calipers than the tiny drum brake slave cyls so as has been said up the diameter of the master cyl to 7/8 or even 1" / 25mm which will shift more fluid per amount of pedal movement, yes the effort is more but fitted 1" in a kit where a 3/4 had been before without a servo and although it was heavier press hard and it would lock up working on area I seem to remember 67% greater area which isn't twice as much so not a huge difference. in the case of my escort based kit car a transit 1" had the same exterior dimentions as the escort 3/4" except the stud spacing was narrower by a couple off mm.
    Whilst a 1" would probably work it's best to stick with the one that gives greatest line pressure vs pedal travel and feel The larger bore REDUCES line pressure which reduces clamping pressure.

  10. #18
    Off the Xmas card list kapri's Avatar
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    Quote Originally Posted by Ian r hall View Post
    Righto, what car would have had 7/8" master?
    You should find a suitable one in the Lockheed Landrover range although they appear to be a different design they use the standard Girling / Lockheed/ Wilwood bolt pitch . Girling remote m/c versiosn were used on Mk 2 Jags and old P6 Rovers but are around the £100 mark with Landrover at least half of that on E bay.

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    Tilton make some aftermarket master cylinders in many sizes, can get either 7/8" or 1". Is bigger better?

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    as Kapri said bigger will reduce line pressure I have to admit my "scientific" way of finding a master cyl was to walk round a scrappy holding the escort mk 2 master cyl and looking at what was fitted transit just happened to be the same design with outlets in the same places so it was more luck than judgement. Just wondering what size master cyl a car with rear discs would have as I think its the rear discs taking more fluid and therefore making the pedal feel like theres air in it. On Jago Geeps because the rod passes through much thicker fibreglass than the steel on an escort the rod is too short so the solution is cut off the fork weld a nut to the fork and a bolt to the shaft (I used an allen head bolt and filed the rod to a rough hex) thus making an adjustable length rod jack front wheel up and adjust rod till it applies brake then back off a turn lock rod and the movement of the pedal starts moving fluid almost instantly. worth also checking for wear in bushes bearings and pins as once has a midget with wear in the pin securing pedal to push rod which had made the brakes similar to that described, bleed bleed bleed to no avail tried a bolt instead of worn pin and braking was restored (didn't leave bolt went and got another pin) I suppose it could be a combination of things?

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