28-01-2019, 03:36 AM
A couple of idle comments...
The system is not all that "simple". Given no prior hints very very few mechanics or anyone else under the car would likely tumble to the arrangement, intended working, and reason for the concentric shafts? I dont think a description appears in any of the standard texts.
Full bedding of the shoes is much less simple than on moderns where the actuator is free to positon around the drum and the shoes ditto across the drum.
The movement of the front axle rearward has an effect so rolling roads can be deceptive, esp on handbrake performance if assessed only from the rear axle! The four pad type more informative but Seven unlikely to fit on!
(The tendency for axle to spring rearward is worst on specials with light lowered radius rods, hence much of the enthusiam for Bowdenex brakes. Incidentally the action tends to cause the pre Girling radius rods to slowly twist out of vertical, reducing castor.
(I took my Seven to a fancy govt testing station when these were new years ago, but it would not span the inspection pit or fit the brake machine so the brakes were tested the same way as every one man garage did)
The system is not all that "simple". Given no prior hints very very few mechanics or anyone else under the car would likely tumble to the arrangement, intended working, and reason for the concentric shafts? I dont think a description appears in any of the standard texts.
Full bedding of the shoes is much less simple than on moderns where the actuator is free to positon around the drum and the shoes ditto across the drum.
The movement of the front axle rearward has an effect so rolling roads can be deceptive, esp on handbrake performance if assessed only from the rear axle! The four pad type more informative but Seven unlikely to fit on!
(The tendency for axle to spring rearward is worst on specials with light lowered radius rods, hence much of the enthusiam for Bowdenex brakes. Incidentally the action tends to cause the pre Girling radius rods to slowly twist out of vertical, reducing castor.
(I took my Seven to a fancy govt testing station when these were new years ago, but it would not span the inspection pit or fit the brake machine so the brakes were tested the same way as every one man garage did)