Fiting 406 Master Cylinder Into The 405

[scoop 0]

i have seen that the 406 master cylinder is stronger than the 405 one giving higher pressure thus giving better and shorter breaking response, but the thing is will it fit in straight into the 405 because i've seen that the 405 standard master cylinder is fitted just in a small area, so how could the 406 master cylinder fit in that small area??

[cammmy 1]

I've heard it fits but I can't guarantee that. It's not too much bigger is it?

 

Are you able to lock up the wheels under hard braking? If so is there any point to changing out the cylinder to one that will lock them up more easily?

[scoop 0]

I've heard it fits but I can't guarantee that. It's not too much bigger is it?

 

Are you able to lock up the wheels under hard braking? If so is there any point to changing out the cylinder to one that will lock them up more easily?

well, my brakes lock but not that easy, i wanna touch the pedal and feel that the car stops seriously, does the 406 master cylinder require another servo than the 405 standard one??

[welshpug 1,657]

Fitting a 406 m/c will require MORE pedal force to slow a vehicle down.

 

If it doesn't fuit then try and find a 405 T16 m/c, they are the same 23.8mm size as they had 57mm pistons in their front brake calipers, most other 205's have a 54mm piston and a 22.2mm M/C IIRC.

[cammmy 1]

Fitting a 406 m/c will require MORE pedal force to slow a vehicle down.

 

Learn something new everyday. Would you need to change out the servo too to lessen the force required?

[DRTDVL1345402287 0]

Cam i'm sure you would have see this when i posted it in my build thread...

 

 

Increasing the master size deceases the ratio at the caliper, likewise using a smaller master will increase the force but you might get a longer pedal.

Edited August 20, 2010 by DRTDVL

[cammmy 1]

Yeah I did, just forgot about it I learn new things about cars everyday. Hard to keep track of it all.

[DRTDVL1345402287 0]

Yeah I did, just forgot about it I learn new things about cars everyday. Hard to keep track of it all.

 

All good... defrag you mind!

[cammmy 1]

So pretty much a larger m/c would result in a harder pedal but shorter travel?

[DRTDVL1345402287 0]

A smaller master cylinder will create more brake fluid pressure but will also increase brake pedal travel.

 

The smaller diameter cylinder requires a longer stroke to move the volume of fluid necessary to move the caliper pistons during braking.

 

Larger master cylinders will create less pressure but will require less travel.

[scoop 0]

A smaller master cylinder will create more brake fluid pressure but will also increase brake pedal travel.

 

The smaller diameter cylinder requires a longer stroke to move the volume of fluid necessary to move the caliper pistons during braking.

 

Larger master cylinders will create less pressure but will require less travel.

i agree, i will try fitting a 406 one

[petert1345402284 0]

How did you go with fitting the 406 m/c ?

[welshpug 1,657]

if you want the 23.8mm M/C that'll fit directly try and get a 405 T16 item.

 

I think 405 specific units are quite short though I have never compared one next to any others, the 406 unit is quite large.