Brake Master Cylinder Sizing
Posted: April 7th, 2008, 9:47 pm
Hello,
First off, yes I searched, and I found a thread with a similar title that Keith started. But I had additional questions.
One of the master cylinders on my AD has sprung a nice leak, and the other has issues with galled up threads on the brake pipe connection. I have been fighting small seeps, and the bad cylinder has suddenly turned into a puddle maker overnight. So, I'm just going to replace both and have that job checked off.
From what I can pull off the Girling cylinders, I have two 5/8" cylinders with a fairly basic balance bar with forward bias. The car suffers from a longish pedal. It stops just fine, but it seems to take a lot of travel to really get the bite. I have the drum adjusters set correctly, and there is no significant free play in the pedal assembly or connections to the master cylinders. Like I said, the overall braking power is very good, and the balance is spot on, it just takes more pedal movement than I would want. Under race conditions, everything performed great at Thunderhill two weeks ago, except of course for the minor seeping previously mentioned. And now the puddle...
So...get new 5/8" master cylinders and hope my longish pedal is caused by the leaky cylinder? Or would getting 3/4" master cylinders help with the longish pedal?
I want proper braking, but would also enjoy shortening the pedal travel a wee bit, as that would allow me to run the steering quickener that otherwise got in the way of the back of the brake pedal arm. Can i have my cake and eat it to?
Thank you,
Chris H.
'64 AD
http://www.subrew.com/tmp/graphics1.jpg
First off, yes I searched, and I found a thread with a similar title that Keith started. But I had additional questions.
One of the master cylinders on my AD has sprung a nice leak, and the other has issues with galled up threads on the brake pipe connection. I have been fighting small seeps, and the bad cylinder has suddenly turned into a puddle maker overnight. So, I'm just going to replace both and have that job checked off.
From what I can pull off the Girling cylinders, I have two 5/8" cylinders with a fairly basic balance bar with forward bias. The car suffers from a longish pedal. It stops just fine, but it seems to take a lot of travel to really get the bite. I have the drum adjusters set correctly, and there is no significant free play in the pedal assembly or connections to the master cylinders. Like I said, the overall braking power is very good, and the balance is spot on, it just takes more pedal movement than I would want. Under race conditions, everything performed great at Thunderhill two weeks ago, except of course for the minor seeping previously mentioned. And now the puddle...
So...get new 5/8" master cylinders and hope my longish pedal is caused by the leaky cylinder? Or would getting 3/4" master cylinders help with the longish pedal?
I want proper braking, but would also enjoy shortening the pedal travel a wee bit, as that would allow me to run the steering quickener that otherwise got in the way of the back of the brake pedal arm. Can i have my cake and eat it to?
Thank you,
Chris H.
'64 AD
http://www.subrew.com/tmp/graphics1.jpg