The design of the wheel cylinders was purposely done to trap air! The in/out for the fluid shares the same port and at the front, the port to one cylinder on each side is at the lowest point, perfect to trap air pockets - who thought that one through? Same as the brake light switch as you discovered, you could have pre-filled this first, ok, some would drip out, but it would help reduce the air pocket. At the factory the switch should have been mounted sideways or inverted - the way it is fitted is a clever design to trap air! When I have bled the brakes I have primed the wheel cylinders first to give them a better chance, I also have bled with the drums off so the shoes move out, then with these extended, push each shoe back with the bleed nipple open, surprising how much more air is expelled. Also, cracking joints helps shift trapped pockets. I modified a master cylinder cap to allow the Gunsons Ezibleed to be used, that helps force the air out. Needs patience! Thanks for sharing.
That old switch looked like Tony Robinson had dug it up 😂. Who doesn't love a Moggy? I don't know anyone who hates them which is some achievement for any car.
The design of the wheel cylinders was purposely done to trap air! The in/out for the fluid shares the same port and at the front, the port to one cylinder on each side is at the lowest point, perfect to trap air pockets - who thought that one through? Same as the brake light switch as you discovered, you could have pre-filled this first, ok, some would drip out, but it would help reduce the air pocket. At the factory the switch should have been mounted sideways or inverted - the way it is fitted is a clever design to trap air!
When I have bled the brakes I have primed the wheel cylinders first to give them a better chance, I also have bled with the drums off so the shoes move out, then with these extended, push each shoe back with the bleed nipple open, surprising how much more air is expelled. Also, cracking joints helps shift trapped pockets.
I modified a master cylinder cap to allow the Gunsons Ezibleed to be used, that helps force the air out.
Needs patience!
Thanks for sharing.
That old switch looked like Tony Robinson had dug it up 😂. Who doesn't love a Moggy? I don't know anyone who hates them which is some achievement for any car.
Don’t think anyone dislikes them!… yeah the switch was past it
Great video, been looking forward to this!👍Interesting.
Thanks for watching! Glad it was interesting.
Another enjoyable, interesting and useful video. Thank you 🙂🙂
Glad you enjoyed!
I can't get my brake lights to switch off, any ideas?
Interesting video BLG, hope the new switch lasts a while👍
Thanks for watching, we will see!…
Drive progressively....I do that in my 107 👍
It’s the only way!