by awiedie » Sat Jan 13, 2024 6:54 pm
John, thanks for your comments. Having rebuilt the brake system quite a few years ago, I had to go back to the manual to refresh my memory on how things work. There are only the two ports on the master cylinder - from the reservoir and to the system with a seal on the end of a valve to prevent fluid from going back to the reservoir during braking. As an aside, I had this problem on my E Type one time where the small rubber cup seal on the end of the clutch master cylinder piston had deteriorated and every time I pushed on the pedal, all I was doing was pushing most of the fluid back into the reservoir, hence, gear changes were an adventure. I was using silicone fluid and switched to Dot fluid in that system but am still running silicone in the brake system - since 1990. Anyway, there is no adjustment on the S Type brake master cylinder push rod as it is of a fixed length with a clevis and pin attaching it to the brake pedal. I think I'm leaning toward the booster as the culprit.
Glyn, thank you also for the comments and diagrams. First, as to the anti-creep system, I could never get that adjustment correct at the carb linkage so I just disconnected the bullet connector at the switch and therefore have no anti-creep. The booster, of course, is a whole other can of worms. During the course of trying to figure this out, I studied the diagrams and text in the workshop manual as to how the system worked. Seemed pretty complex to me, especially that air valve with all the seals and springs! A rebuild kit is available for the booster but doesn't contain much. Maybe a new unit is in order but they seem to be hard to come by and are quite expensive.
John, thanks for your comments. Having rebuilt the brake system quite a few years ago, I had to go back to the manual to refresh my memory on how things work. There are only the two ports on the master cylinder - from the reservoir and to the system with a seal on the end of a valve to prevent fluid from going back to the reservoir during braking. As an aside, I had this problem on my E Type one time where the small rubber cup seal on the end of the clutch master cylinder piston had deteriorated and every time I pushed on the pedal, all I was doing was pushing most of the fluid back into the reservoir, hence, gear changes were an adventure. I was using silicone fluid and switched to Dot fluid in that system but am still running silicone in the brake system - since 1990. Anyway, there is no adjustment on the S Type brake master cylinder push rod as it is of a fixed length with a clevis and pin attaching it to the brake pedal. I think I'm leaning toward the booster as the culprit.
Glyn, thank you also for the comments and diagrams. First, as to the anti-creep system, I could never get that adjustment correct at the carb linkage so I just disconnected the bullet connector at the switch and therefore have no anti-creep. The booster, of course, is a whole other can of worms. During the course of trying to figure this out, I studied the diagrams and text in the workshop manual as to how the system worked. Seemed pretty complex to me, especially that air valve with all the seals and springs! A rebuild kit is available for the booster but doesn't contain much. Maybe a new unit is in order but they seem to be hard to come by and are quite expensive.