Mix
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| posted on 11/12/04 at 06:03 PM |
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Master cylinder travel
I'm in the process of designing my pedal box, I'm using a balance bar and twin Girling master cylinders, (0.625 and 0.75). Does anybody
know roughly the amount of travel there will be on the master cylinder push rods, (or more correctly on the balance bar spherical bearing)?
I realise this may be like asking 'how long's a piece of string' but all I'm after is a ball park figure asuming that the
system is fully bled etc.
If it helps I have Sierra rear disks and callipers and Cortina front disks and callipers, (all either fully reconditioned or new).
Cheers Mick
PS. As a result of the above exercise I now have Turbocad drawings of the master cylinder and balance bar assemblies. If they are of any use to anyone
let me know.
[Edited on 11/12/04 by Mix]
[Edited on 11/12/04 by Mix]
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rusty nuts
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| posted on 11/12/04 at 06:11 PM |
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Can measure the travel on mine for you tomorrow, but will be late afternoon before I get home. Have a similar set up but have drum rears ,
shouldn't be a lot of difference though. Rusty
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Mix
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| posted on 11/12/04 at 06:13 PM |
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Star you are Sir
Many thanks Mick
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britishtrident
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| posted on 11/12/04 at 09:01 PM |
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The pedal travel if one circuit fails is determined by the total side clearance between the forks and the tube on the pedal in which the bearing
slides. Normally this is set to about 0.020" or 0.5mm which gives a 50% increase in travel if one circuit fails.
Strongly advise not to scratch design this part buy in a complete kit that you can weld to your own design of pedal.
[Edited on 11/12/04 by britishtrident]
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Mark Allanson
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| posted on 11/12/04 at 09:45 PM |
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quote:
Originally posted by britishtrident
The pedal travel if one circuit fails is determined by the total side clearance between the forks and the tube on the pedal in which the bearing
slides. Normally this is set to about 0.020" or 0.5mm which gives a 50% increase in travel if one circuit fails.
Strongly advise not to scratch design this part buy in a complete kit that you can weld to your own design of pedal.
[Edited on 11/12/04 by britishtrident]
I don't really understand what you mean, which forks?, My pedal doesn't have a tube
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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britishtrident
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| posted on 12/12/04 at 01:17 AM |
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See this URL for drawing in PDF format http://www.apracing.com/car/cylinder/cp5500_4cd_iss6.pdf
These URL have other drawings which may be of interest
http://www.stockcarproducts.com/pedassy.htm
http://www.raceparts.co.uk/racetech/balance.htm
http://www.erareplicas.com/gt/brakes.htm
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Mix
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| posted on 12/12/04 at 09:02 AM |
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BT Thanks for the concern. My balance bar assembly was purchased from Rally Design.
Your comments about pedal travel in the event of one circuit failing are much appreciated as they are very pertinent to the final design.
Cheers Mick
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rusty nuts
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| posted on 12/12/04 at 04:54 PM |
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Mick , measured push rod travel on my car today, have approx 10mm movement on each pushrod. Bear in mind that car hasn't yet passed S.V.A. and
brake bias probably needs final adjustment which may vary travel , hope this helps, Rusty
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Mix
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| posted on 13/12/04 at 08:13 AM |
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That's perfect Rusty. Thanks very much, back to the CAD
Cheers Mick
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