Another Master Cylinder issue....
Posted: Sun Feb 13, 2022 3:28 pm
So, following on from my last Master Cylinder question, here's another little issue.
The background to this is that Basil had a lot of work done in the past, possibly some 20 years ago.
I've been sorting out the brakes, including new seals in the MC, and I've always wondered why the gearbox cover hole for the MC Filler Cap had been extended....
I now realise that the MC is about 1/2" too far forward and also possibly sitting a little higher than it should as I don't think the filler cap should be that far proud of the floor??
I came to this earth shattering conclusion based not just on the enlarged hole but because with the Push Rod fully screwed up I have barely 1/4" of Free Travel on the top of the pedal before the pushrod touched the MC piston; it should of course be 3/4" ....
The few images I can find online of installed MCs, all show the forward edge of the Filler Cap more in line with where I have added the yellow line. I can only assume that the restorer made their own chassis leg or it came with no MC mounting holes in it. And they messed up on the correct position.
Short of removing everything and making a meal of it, I think the easiest option to get the required free travel on the brake pedal is to shorten the Push Rod by about 1/4".
That won't interfere with the operation of the Rod, as the end fitting won't be too near the Rubber Sleeve, and given the arc of the Pedal, it should be more than enough to give the required 3/4" Free Travel on the pedal top.
Anyone got any alternative idea?
![Whatever :roll:](./images/smilies/icon_rolleyes.gif)
The background to this is that Basil had a lot of work done in the past, possibly some 20 years ago.
I've been sorting out the brakes, including new seals in the MC, and I've always wondered why the gearbox cover hole for the MC Filler Cap had been extended....
![:-?](./images/smilies/icon_confused.gif)
I came to this earth shattering conclusion based not just on the enlarged hole but because with the Push Rod fully screwed up I have barely 1/4" of Free Travel on the top of the pedal before the pushrod touched the MC piston; it should of course be 3/4" ....
The few images I can find online of installed MCs, all show the forward edge of the Filler Cap more in line with where I have added the yellow line. I can only assume that the restorer made their own chassis leg or it came with no MC mounting holes in it. And they messed up on the correct position.
Short of removing everything and making a meal of it, I think the easiest option to get the required free travel on the brake pedal is to shorten the Push Rod by about 1/4".
That won't interfere with the operation of the Rod, as the end fitting won't be too near the Rubber Sleeve, and given the arc of the Pedal, it should be more than enough to give the required 3/4" Free Travel on the pedal top.
Anyone got any alternative idea?