I'm thinking about using twin master cylinders and no booster on my TA22
Anyone ever done this before or even looked into it? I have read and been told that using 2 masters instead of just 1 makes braking a little easier with no booster!
I cant see a huge advantage in doing this. Most master cylinders are dual line so I dont see the advantage of running two single line master cylinders as opposed to one dual line, or are you suggesting running two dual line master cylinders?
I would suggest talking to dattoman1000 on performance forums.
From a strictly engineering point of view:
Using two dual line master cylinders instead of one just means that each master cylinder will displace half of the fluid of a single dual line master cylinder inorder to provide the same slave cylinder displacements. Or alternatively the pedal will only have to move half the distance with two master cylinders as opposed to one.
Pressure (in brake system) = Force (on piston) / Area (of piston)
For 1 master cylinder the force is distributed over one piston area, but for two master cylinders the force is effectively applied over two piston areas (or the equivalent single 'large' piston area), i.e.
1 Master Cylinder: Pressure = Force / Area
2 Master Cylinders: Pressure = Force / (2 x Area)
= (1/2) (Force / Area)
= (1/2) 1 Master Cylinder
So for two master cylinders you will be halving the pressure in the system for a given applied force thus making braking more difficult !!!
I am not suggesting putting on the smallest possible master cylinder to maximise pressure in the line as you will run into problems with insufficient brake fluid displacement. It is a compromise between displacement and piston size.
This is why master cylinder pistons are usually small compared to slave cylinder pistons - to provide a mechanical gain via hydaulics.
2 will feel like you have to apply more pressure for sure. Around town this may be a bit of an issue, until you get used to it anyhow.
Don't forget you won't have a brake booster to assist.
An advantage is you can set up a brake balance bar/bias system on your brake pedal so you can adjust F/R bias accordingly.
All the above good for racing.
If it's room your after due to a conversion, perhaps better to relocate the booster up front somehwere and just have the cylinder on the firewall.
Twin masters and no booster
Sun, 14 September 2003 09:28
