Vixen rear brake conversion
Discussion
GAjon said:
It is a good upgrade, but not a secret unknown to TVR people, I did it on my M in 1988 along with the bigger bore master cylinder up grade.
Brake shoes become the weak point for track use, but this is manageable with good care and maintenance.
Good to know. A swap to Alfin costs £300+ and only improves very hot braking (and a bit of weight), this is under £30 and improves braking at all temperatures. The Triumph m/c should be good for the volume in standard form as the improved braking strength comes from the slave piston moving less for a given pedal pressure and on reasonably adjusted shoes the additional fluid volume is tiny. Brake shoes become the weak point for track use, but this is manageable with good care and maintenance.
Dollyman1850 said:
You seem confident with those claims. Have you measured the displaced volumes..??
Out of interest where are you all driving so quickly on the roads to need all these upgrades.. My race car runs 2 pot iron calipers front and std drums and cylinders rear and stops OK in race conditions !!
The additional displacement per 10mm travel (it’ll be less than this obviously but it shows the point) would be approx 1.6cc per cylinder, so a total of 3.2cc max. One advantage is the force is on one side only and moves the slave on its bracket so this additional force will overcome the bracket friction better to help the second shoe move. I doubt 3.2cc will have much impact on m/c capacity. Out of interest where are you all driving so quickly on the roads to need all these upgrades.. My race car runs 2 pot iron calipers front and std drums and cylinders rear and stops OK in race conditions !!
I haven’t suggested a multiple upgrades beyond what people generally do - better front discs and pads and sometimes better callipers - which increase the front braking well but for the rears it’s been Alfins and that’s it. No one has come up with an easy rear disc conversion but if they had I’m sure if would sell well and indeed I have no doubt it would be on your own car by now.
I would have thought you would be interested in this as it’s a very valid (and well tested) mod, largely missed or forgotten over the years but IMO worth doing to better balance front end upgrades.
Edited by anonymous-user on Sunday 24th April 09:50
Dollyman1850 said:
V6 Pushfit said:
The additional displacement per 10mm travel (it’ll be less than this obviously but it shows the point) would be approx 1.6cc per cylinder, so a total of 3.2cc max. One advantage is the force is on one side only and moves the slave on its bracket so this additional force will overcome the bracket friction better to help the second shoe move. I doubt 3.2cc will have much impact on m/c capacity.
I haven’t suggested a multiple upgrades beyond what people generally do - better front discs and pads and sometimes better callipers - which increase the front braking well but for the rears it’s been Alfins and that’s it. No one has come up with an easy rear disc conversion but if they had I’m sure if would sell well and indeed I have no doubt it would be on your own car by now.
I would have thought you would be interested in this as it’s a very valid (and well tested) mod, largely missed or forgotten over the years but IMO worth doing to better balance front end upgrades.
So you are fitting a pair of rear cylinders which require 3.2cc of additional capacity ! The tandem master cylinder on the car has a fixed cylinder capacity already biased to front brake operation. Everything may be fine but are you sure? So long as you are sure then no problem. I haven’t suggested a multiple upgrades beyond what people generally do - better front discs and pads and sometimes better callipers - which increase the front braking well but for the rears it’s been Alfins and that’s it. No one has come up with an easy rear disc conversion but if they had I’m sure if would sell well and indeed I have no doubt it would be on your own car by now.
I would have thought you would be interested in this as it’s a very valid (and well tested) mod, largely missed or forgotten over the years but IMO worth doing to better balance front end upgrades.
Edited by anonymous-user on Sunday 24th April 09:50
If you note Mr Liveseys comment above.. He carried out the conversion with a larger bore tandem master cylinder at the front.
I have a disc conversion bye the way but I am not all that happy with the way it works with 4 pots on the front and rear pistons when utilising the std tandem master cylinder.
N.
Edited by Dollyman1850 on Sunday 24th April 23:52
Slaves are single piston so total = 2 x marginally larger.
Sounds like you’ve got at least 8 pistons (possible 10) each much larger so I’m surprised you didn’t change the o/e m/c.
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