Brake cylinder question

CVH and Zetec tuning, suspension and braking mods.
Post a reply

Brake cylinder question

Postby Stoned on Wed Dec 03, 2003 7:22 pm

I was just going to buy a new brake cylinder for my Escort servo.

BurtonPower has 3 options

RD300 MASTER CYLINDER .625in 7/16 UNF INLET. 3/8 UNF OUTLET
RD300B MASTER CYLINDER .700in 7/16 UNF INLET. 3/8 UNF OUTLET
RD300A MASTER CYLINDER .750in 7/16 UNF INLET. 3/8 UNF OUTLET

Clearly the only difference is the bore size value?

Am I right in thinking getting the biggest size possible (.750) would result in better braking force for my setup, due to being able to push more liquid?
I have discs all round and a Fiesta brake cylinder was useless so I'm looking to get as good a model as possible.

What's the deal!

Cheers
Stoned
Elite Post Master
Elite Post Master
 
Posts: 8944
Joined: Mon Apr 22, 2002 10:46 pm
Location: Portsmouth
Top

Postby heeman10 on Wed Dec 03, 2003 9:31 pm

Always a bit of a headfcuk this kind of question! lol

Pressure = Force / Area

So if you reduce the cross-sectional area (or reduce the bore of the master cylinder in other words) then the force applied needs to be smaller to get the same pressure. So if you get a wider bore, you'll need to apply more force to retain the same pressure in the system.

As I say, this is one that fries the brain a bit, but I think I'm right in what I say :-?

does that help chris?!
Image
James .:. 193bhp/245lbft Zetec Turbo Mk3. Click sig for conversion thread + videos .:.
heeman10
Elite Post Master
Elite Post Master
User avatar
Posts: 28746
Joined: Fri Nov 08, 2002 5:32 pm
Location: Somerset
Your car: Audi TT TDI Quattro S line
Top

Postby PaulC on Wed Dec 03, 2003 9:35 pm

I think thats right....

Say a pipe is 10mm wide, and another is 20mm wide.
If you pushed brake fluid (just imagine!) down them, the 10mm one would have more pressure at the end when the same force is used.
PaulC
Elite Post Master
Elite Post Master
 
Posts: 4573
Joined: Sat Jan 12, 2002 12:00 am
Location: Manchester, Lancashire
Top

Postby heeman10 on Wed Dec 03, 2003 9:45 pm

So I suppose to finish the question off...

The large bore would make for a more sensitive feel I guess, (in a similar way to PAS and normal steering) and the small bore would be lighter on the thighs :bonkers:

How about a compromise and go half way? Ok sensitivity and not too tiring :) Shame you can't try them all and see which feels best really.
Image
James .:. 193bhp/245lbft Zetec Turbo Mk3. Click sig for conversion thread + videos .:.
heeman10
Elite Post Master
Elite Post Master
User avatar
Posts: 28746
Joined: Fri Nov 08, 2002 5:32 pm
Location: Somerset
Your car: Audi TT TDI Quattro S line
Top

Postby Stoned on Wed Dec 03, 2003 9:49 pm

lol so which should I get :lol:

I dont care if the pedal is a little stiff as long as the braking is good. Dont forget it's a Escort servo too so it shouldnt be hard work either way.
Stoned
Elite Post Master
Elite Post Master
 
Posts: 8944
Joined: Mon Apr 22, 2002 10:46 pm
Location: Portsmouth
Top

Postby Stoned on Thu Dec 04, 2003 12:57 pm

Well as it turns out their website is wrong. The cylinders they list there are only for ancient single piston Escorts/Capri's so none of them apply :)

A genuine brake cylinder is now being sourced from a local motorfactors.
Stoned
Elite Post Master
Elite Post Master
 
Posts: 8944
Joined: Mon Apr 22, 2002 10:46 pm
Location: Portsmouth
Top

Postby heeman10 on Thu Dec 04, 2003 1:35 pm

Good :D
Image
James .:. 193bhp/245lbft Zetec Turbo Mk3. Click sig for conversion thread + videos .:.
heeman10
Elite Post Master
Elite Post Master
User avatar
Posts: 28746
Joined: Fri Nov 08, 2002 5:32 pm
Location: Somerset
Your car: Audi TT TDI Quattro S line
Top

Postby Stoned on Thu Dec 04, 2003 6:02 pm

Well I got it!

It's all shiny silver and stuff (painted)... except the end which isnt painted and is bare metal :x

How annoying!
Stoned
Elite Post Master
Elite Post Master
 
Posts: 8944
Joined: Mon Apr 22, 2002 10:46 pm
Location: Portsmouth
Top

Postby heeman10 on Fri Dec 05, 2003 3:55 pm

That's a bit gay! Probably painted it while it was sat on the kitchen table :rolleyes: pics? :D
Image
James .:. 193bhp/245lbft Zetec Turbo Mk3. Click sig for conversion thread + videos .:.
heeman10
Elite Post Master
Elite Post Master
User avatar
Posts: 28746
Joined: Fri Nov 08, 2002 5:32 pm
Location: Somerset
Your car: Audi TT TDI Quattro S line
Top
Post a reply
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group | Made irresistible to the Big G with goodies from phpBB SEO

Twitter

The second 20th Anniversary article, a dive into the history of how the site came about is available here: https://t.co/kbCfZ4sf0R

17:44, 4th December 2021 Twitter Web App

To celebrate https://t.co/wXVkvJipaS being 20 years old this year, I've written a series of articles detailing the… https://t.co/B0vE0Y3KvP

17:42, 4th December 2021 Twitter Web App

Follow fiestaturbo.com on Twitter:
http://twitter.com/fiestaturbo/

RSS Feeds

Subscribe to the RSS feed

What is RSS?

RSS is a technology that lets you use special applications or modern browsers to notify you you when a site is updated. You can then read the updated content in that application or your browser.

To subscribe to these RSS feeds you need to copy the links above. For instructions on how to add it to the feeds you keep track of, consult the documentation of your RSS reader.