Dooey99
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| posted on 8/1/13 at 11:35 PM |
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Brake master cylinder
I have an escort mk2 brake master cylinder with servo... Can I remove the servo completely and insert the rod from the pedal to master cylinder
directly into the master cylinder removing the servo completely?
Or do I need to buy a master cylinder without a servo?
I'm trying to as much stuff from the donor car as I can or bits I can lie about so I can get my car registered to the donor car plates. If I put
a pedal box and 2 cylinders a d a bias bar I do t think I could get away with it.
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JeffHs
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| posted on 9/1/13 at 09:39 AM |
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That's what I did and it works fine. I used a Teeves M/C where the rod sits down inside a hollow cylinder, so it can't fall out. I had to
make a new rod to fit and getting the length right is critical. Initially my rod was about 2 mm too long, fine when cold but caused the brakes to bind
and overheat when hot. I didn't discover the problem until my drive to SVA.
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britishtrident
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| posted on 9/1/13 at 01:58 PM |
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The way a lot of people go is a new Fiat 124 master cylinder which is very cheap from Brakes International Website and will reduce the pedal
pressures to a reasonable level without servo.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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loony
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| posted on 9/1/13 at 08:28 PM |
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Look at Fiat Cinquecento/Seicento brake master cylinder... 19mm bore but with "standard" M10x1 threads...
And now - sorry for hijack... but I'm confused.
Almost everyone here suggest 19mm bore... but... is it possible that MC is too small for all-disc setup ? (60mm/43mm pistons)
I heard about it form one of Polish builders, that his 19mm can't lock all 4 wheels... although MC full travel/compression.
[Edited on 9/1/13 by loony]
Lucas
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loony
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| posted on 28/1/13 at 08:53 AM |
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I found that all-disc Sierra (60/43 pistons) without ABS used 23,8mm MC... so - is 22,2 smaller enough to have good brake feel (Haynes Roadster
pedalbox) ?
If so - I can just use standard Sierra MC, or maybe use something like 20,64mm MC... just in case 
Lucas
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britishtrident
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| posted on 28/1/13 at 01:05 PM |
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If you go back to the 1960s and 1970s cars were servos were optional the non servo versions always used a smaller bore master cylinder ( ie
0.75" ) than the servo version.
In normal operation disc brakes don't need more fluid pumped than drum brakes if the brakes are in good condition, bled and setup correctly
only a tiny ammount of fluid flows when the brakes are applied.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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whitestu
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| posted on 28/1/13 at 03:52 PM |
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quote:
I found that all-disc Sierra (60/43 pistons) without ABS used 23,8mm MC... so - is 22,2 smaller enough to have good brake feel (Haynes Roadster
pedalbox) ?
If so - I can just use standard Sierra MC, or maybe use something like 20,64mm MC... just in case
You can use a 22mm Sierra MC but the pedal will be rock solid an need a big push to get much brake effort. I ran one for a while and the brakes worked
well enough but on track I was pushing the pedal as hard as I could.
With a 19mm MC the predal is much softer and moves more but needs a lot less pressure to get to the point of locking the wheels.
Stu
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loony
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| posted on 29/1/13 at 08:21 AM |
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I think I will trust you (not one Polish builder) and use max 20,64mm MC - depends on what I get cheap 
I saw Samko 20,64 mm MC for Fiat Ritmo/Uno at about 10GBP... I think same seller had similar 19,05mm Samko MC for Fiat Uno.
Both MC with suitable 3x M10x1 outputs... and design to work as front-rear dual circuit.
[Edited on 29/1/13 by loony]
Lucas
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britishtrident
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| posted on 29/1/13 at 11:39 AM |
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Long pedal travel on a home build with a Sierra rear discs is usually caused by the not getting all the air out the rear callipers, because of
the way they are mounted the bleed nipple is not at the highest point. The best way to get all the air out when bleeding is to unbolt the
calliper an turn it so the bleed nipple is at the top.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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loony
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| posted on 1/2/13 at 04:11 PM |
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Finally I bought Delphi LM70023 (Fiat Uno, Panda) master cylinder - 19,05mm, 3x M10x1 ports...
DELPHI-LM70023-master-cylinder
In my opinon - better than recomended here Fiat 124 MC... because of M10x1 threads (compatible with Sierra MC brake lines) and it's cheaper
Lucas
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old_timbo
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| posted on 2/2/13 at 11:17 PM |
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What Brake Fluid Reservoir are you going to use?
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rusty nuts
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| posted on 3/2/13 at 08:41 AM |
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quote:
Originally posted by old_timbo
What Brake Fluid Reservoir are you going to use?
Another local builder! I'm in Great Shelford.
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