If so - I can just use standard Sierra MC, or maybe use something like 20,64mm MC... just in case
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.
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.
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.
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]
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
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.
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
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]
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.
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
What Brake Fluid Reservoir are you going to use?
quote:
Originally posted by old_timbo
What Brake Fluid Reservoir are you going to use?