prawnabie
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| posted on 19/1/10 at 09:10 PM |
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Wheel cylinders part 2
Hi
I am using a transit master cylinder with a 23.81mm bore. Cortina calipers up front with standard MK2 drums (8" . CEC car so weighs a fair
bit.
What wheel cylinder sizes should I be using on the rear? I currently have 22.6 but I am redoing the rear brakes so wondering If i should get these or
the 19/17mm ones.
Cheers
Shaun
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woolly
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| posted on 19/1/10 at 09:27 PM |
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are the rear brakes too powerful at the moment.
woolly
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prawnabie
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| posted on 19/1/10 at 09:38 PM |
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Not that i have noticed, but tbh I don't drive it that hard
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woolly
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| posted on 19/1/10 at 09:42 PM |
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reducing the rear wheel cylinder size will reduce the braking effort and give you slightly less pedel movement.
sorry if you know that.
woolly
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prawnabie
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| posted on 19/1/10 at 09:43 PM |
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I don't tbh lol
Im just looking at wheel cylinder books now to order and all the mk2's are either 17 or 19 mm bore.
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woolly
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| posted on 19/1/10 at 10:00 PM |
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mk2 escorts and cortina 3s used the girling 8 and 9 inch rear drums.
i think one of the cortina estates had the big cylinder.
really testing my memory now.
woolly
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marcjagman
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| posted on 19/1/10 at 10:04 PM |
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Can't you just drill holes in the brake shoes?
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britishtrident
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| posted on 20/1/10 at 07:55 AM |
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Worry more about the master cylinder bore --- way too big
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prawnabie
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| posted on 20/1/10 at 10:21 AM |
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Sorry master cylinder bore is 22.2mm
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britishtrident
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| posted on 20/1/10 at 11:44 AM |
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quote:
Originally posted by prawnabie
Sorry master cylinder bore is 22.2mm
7/8" is way too big for use without a 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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MikeR
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| posted on 20/1/10 at 12:44 PM |
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look up the posts by dick axtell - i think it was he who did some maths on the subject when he worked for girling.
it will be 4 or 5 years ago at a guess (maybe more)
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whitestu
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| posted on 20/1/10 at 01:32 PM |
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I changed from a 22 to 19mm MC and is does make a worthwile improvement. Not that the brakes were in any way bad with the 22mm, just felt very sloid
and a bit woody!
the 19mm gives more pedal travel, but more power and progression.
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britishtrident
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| posted on 20/1/10 at 01:51 PM |
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Back to wheel cyilinders -- based on experience with Imp rear brakes which were 8" inch drums almost identical to the MK1 Escort. increasing
the wheel cylinder bore runs into the law of dimishing returns. A difference could be felt swapping from 0.75" bore to 0.7" bore rear
cylinders but changing up from 0.75" to 7/8" bore cylinders made no difference.
With drum brakes the distortion of the mechanical bits ie shoes and drums starts to have a bigger effect when you try to put too much force into
them.
[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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prawnabie
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| posted on 20/1/10 at 05:20 PM |
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Ok thanks for the replies. I will try a set of 17.8mm cylinders and see how it goes!
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