JC
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| posted on 12/3/08 at 09:42 PM |
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Removing brake servo
I have finally got to the stage where I am considering brakes/pedals etc. True to the locost spirit, I would like to use the master cylinder from the
donor Fiesta (I'm building a Midi) but I don't want (haven't got space) for the servo. The Chris Gibbs book implies that this can
be done -can anyone give me an idiot guide on how - is it really just a case of remove servo, make new rod?
Sorry if this is a dumb question!
JC
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robinj66
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| posted on 12/3/08 at 10:08 PM |
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Yep!
[IE, that is how you do it, not a dumb question]
Oh Blimey, now I'm confusing myself
[Edited on 12/3/08 by robinj66]
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RazMan
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| posted on 12/3/08 at 11:26 PM |
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That's basically it - just make a new rod to suit your pedal setup.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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britishtrident
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| posted on 13/3/08 at 07:25 AM |
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You need the brake master cylinder and push rod from a non-servoed car.
The reason for this is apart from the difficulties with the push rod arangement the master cylinder on servo equiped cars is a much bigger diameter
than no-servo cars. Without if you don't fit a smaller diameter master cylinder the pedal effort required to the car will be excessive.
Why not look at the brake and clutch pedal arangements on Minis and Metros/Rover 100s.
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Bluemoon
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| posted on 13/3/08 at 09:23 AM |
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But, depends on the weight of you car, if it's half weight of the fiesta, and you have used the whole break system... If we take the servo to be
providing half the breaking force then without the servo and half the car weight, you end up with the same breaking efficiency (so long as you keep
the peddle ratio the same).
Dan
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Marcus
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| posted on 13/3/08 at 12:18 PM |
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quote:
You need the brake master cylinder and push rod from a non-servoed car.
Not strictly so, I used master cylinder from my Manta with the servo removed and made a push rod. The braking force, pedal effort, pedal travel and
balance are close to perfect. All depends on where the pushrod pivot point is in relation to the pedal pivot.
Been on the road 4 years now and the brakes are still very braky!! 
Marcus
Because kits are for girls!!
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Michael
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| posted on 1/4/08 at 09:35 PM |
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Are we saying that using a servo on a 7 would make the brakes lock up under light braking or would you teach yourself to brake differently like when
swapping from one car to another?
I have a servo that fits ok with a small dual circuit master on mine, but have had that now 4 years (still in build process) and wondering now if i
should ditch the servo or live with what i have.
Also will the Crossflow produce enough vacuum for the servo??
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RazMan
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| posted on 2/4/08 at 03:59 AM |
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You would almost definitely teach yourself to brake differently whichever setup you choose. A servo will make things a little over sensitive imo but
on the other hand braking for the first time without a servo can be an exciting experience.
It is all down to piston sizes and pedal ratios - get them right for your individual setup and everything will be fine.
Personally I prefer not to have a servo because it is an unneccessary complication on such a light car, much like power steering.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Mark Allanson
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| posted on 2/4/08 at 08:19 PM |
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I took out my servo on my sierra based system and used the original master cylinder, cortina M16 calipers and capri drums at the rear - I cannot image
a better system for feel and efficiency, totally perfect.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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