27-08-2020, 07:48 AM
Assorted observations. I do recall trying to roughly work out the force on ends of shoes for Austin, semi girling and typical hydraulic. Seem to recall the hydr worked out much higher.
Linings certainly make a huge difference; my everyday 1964 car had acquired shoe by shoe used 1970s rear linings off other same cars. (economy has always been an objective!) The handbrake had become very poor and the foot (unassisted) braking heavy. I replaced the rear leading shoes with NOS Ferodo woven MZ (with zinc and asbestos!)and the difference was remarkable. Can lock wheels with handbrake.
Some hydraulic master cyls incorporate a valve intended to maintain line pressure. My 1960s Lockheed car has but 1950s Girling does not, although with cooling I wonder how much pressure is retained..
For those with mech brakes having the shoes radiussed off the car can be dubious as the shoes are not free to self centre as a modern.
Modern lining materials are intended for powere assist and a very extended life.
Linings certainly make a huge difference; my everyday 1964 car had acquired shoe by shoe used 1970s rear linings off other same cars. (economy has always been an objective!) The handbrake had become very poor and the foot (unassisted) braking heavy. I replaced the rear leading shoes with NOS Ferodo woven MZ (with zinc and asbestos!)and the difference was remarkable. Can lock wheels with handbrake.
Some hydraulic master cyls incorporate a valve intended to maintain line pressure. My 1960s Lockheed car has but 1950s Girling does not, although with cooling I wonder how much pressure is retained..
For those with mech brakes having the shoes radiussed off the car can be dubious as the shoes are not free to self centre as a modern.
Modern lining materials are intended for powere assist and a very extended life.