Identification of Seals for Taffspeed Inboard Hydraulic?
Posted: Mon Jan 24, 2022 1:18 am
Hi all
Anyone know exactly which Mini (or other) seals were used in the Taffspeed inboard hydraulic conversions?
I was very kindly supplied a couple of spares by a fellow Lambretta enthusiast a number of years ago but have only now rebuilt the brake and fitted it to a bike. Whilst the seals looked like a like for like swap, I've struggled to bleed it and now find that the seal is allowing fluid past the piston in the slave cylinder.
Upon inspection, the inner and outer diameters of the seals look the same but the thickness of the seals is slightly different. The old one that I took out looks to be approx 3.1mm thick, whereas the new one is more like 2.6mm thick. Whilst this could be an issue with the seal swelling over time, I doubt that to be the case as the other dimensions are very much the same; I.D. and O.D.
Perhaps I should be talking to Mini spares suppliers, as I note that they list different part numbers for different models. Whilst they all appear to be much the same, the minor differences could well be the cause of my current issue. NB: The current seal will allow slight pressure to build but it soon fades and fluid is being forced past the seal... so it is very close to doing its job, just not quite!
Any historical detail that anyone can offer would be much appreciated.
TIA
Anyone know exactly which Mini (or other) seals were used in the Taffspeed inboard hydraulic conversions?
I was very kindly supplied a couple of spares by a fellow Lambretta enthusiast a number of years ago but have only now rebuilt the brake and fitted it to a bike. Whilst the seals looked like a like for like swap, I've struggled to bleed it and now find that the seal is allowing fluid past the piston in the slave cylinder.
Upon inspection, the inner and outer diameters of the seals look the same but the thickness of the seals is slightly different. The old one that I took out looks to be approx 3.1mm thick, whereas the new one is more like 2.6mm thick. Whilst this could be an issue with the seal swelling over time, I doubt that to be the case as the other dimensions are very much the same; I.D. and O.D.
Perhaps I should be talking to Mini spares suppliers, as I note that they list different part numbers for different models. Whilst they all appear to be much the same, the minor differences could well be the cause of my current issue. NB: The current seal will allow slight pressure to build but it soon fades and fluid is being forced past the seal... so it is very close to doing its job, just not quite!
Any historical detail that anyone can offer would be much appreciated.
TIA