| [ Total Views: 535 | Total Replies: 5 | Thread Id: 100982 ] |
|
|
 sander288
Custom Title Time!
"Bolt-on Master"
Posts: 1404
Threads: 183
Registered: August 26th, 2008
Member Is Offline
Location: Norman Park, QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: This is my bug. There are many others like it, but this one is mine.
|
 posted on February 22nd, 2013 at 09:58 PM |
|
|
Brake Master Cylinders (Single)
On earlier bugs they all had single circuit brakes with a 19mm master cylinder; then in 65 VW went to a 17mm cylinder.
What would be the benefit of changing to a smaller cylinder??? I think that earlier 911's had 17mm cylinders
Cheers
Shaun
|
|
|
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
|
| posted on February 22nd, 2013 at 11:38 PM |
|
|
Basic hydraulic maths. Smaller input piston and larger output piston means greater pressure on the output piston but more effort required on the input
piston. Also, the larger the output then the less it travels in relation to the inputs movement.
madness is in the eye of the beholder  |
|
|
vwo60
Veteran Volks Folk
Posts: 2036
Threads: 71
Registered: February 13th, 2007
Member Is Offline
Location: Pomona Qld
Theme: UltimaBB Psyche Blue
Mood: good
|
| posted on February 23rd, 2013 at 05:56 AM |
|
|
A smaller bore master cylinder would produce a higher line pressure with reduced with pedal effort, all being equal, if you left the standard wheel
cylinders it would require more pedal travel to get the brakes to work but would produce a greater braking force, i do not know if the models that had
the 17MM master cylinder had a change of wheel cylinder size to allow for the reduction in master cylinder diameter, If your car has a 19mm master
cylinder you might end up with excessive pedal travel.
|
|
|
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
|
| posted on February 23rd, 2013 at 10:29 PM |
|
|
Later models used 17mm on the rears but believe stayed at 19m on the front 40mm dual piston calipers.
I'm also pretty sure that my brand new ATE dual MC is 19m bore and not 17 and that all new MC's are this way.
madness is in the eye of the beholder |
|
|
vwo60
Veteran Volks Folk
Posts: 2036
Threads: 71
Registered: February 13th, 2007
Member Is Offline
Location: Pomona Qld
Theme: UltimaBB Psyche Blue
Mood: good
|
| posted on February 24th, 2013 at 12:29 AM |
|
|
Talking about a single circut master cylinder on the earlier cars.
|
|
|
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
|
| posted on February 24th, 2013 at 09:26 PM |
|
|
Didn't know they change the singles bore size 
madness is in the eye of the beholder |
|
|
