Grimeca 4LS brake parts?
Posted: Wed Mar 01, 2023 9:40 pm
The double sided front brake with 4 shoes is well known as standard fitment for certain models of Ducati single.
For example, it is on the Silver Shotgun model.
Each side has a single leading shoe design - one leading, one trailing.
Less well known is the variation with four leading shoes, which uses the same hub but with a twin leading shoe brake on each side.
I have that type of brake on my non-standard single.
Mine needs a replacement speedo drive part - the gear piece within the right side backing plate.
I thought it would be the same as for the normal 4 shoe brake, but evidently not.
The connecting link rod between the brake cams, as normally seen with TLS system, necessitated a change to the angle that this gear's shaft exits from the brake plate. It's at a slightly greater angle, to clear the rod.
When I bought the brake, it was not supplied with the gear but it wasn't obviously different so I just installed one from another brake.
That seemed to work fine, but eventually the speedo stopped working, and investigation revealed a chewed up drive gearbox at the wheel, and then I discovered the cause.
I have no idea how to obtain a correct factory replacement, which may involve changing the bigger worm gear on the hub as well.
If anyone knows who sold these 180mm 4LS Grimeca brakes, I'd be grateful for a lead to a possible supplier of the proper gears.
For example, it is on the Silver Shotgun model.
Each side has a single leading shoe design - one leading, one trailing.
Less well known is the variation with four leading shoes, which uses the same hub but with a twin leading shoe brake on each side.
I have that type of brake on my non-standard single.
Mine needs a replacement speedo drive part - the gear piece within the right side backing plate.
I thought it would be the same as for the normal 4 shoe brake, but evidently not.
The connecting link rod between the brake cams, as normally seen with TLS system, necessitated a change to the angle that this gear's shaft exits from the brake plate. It's at a slightly greater angle, to clear the rod.
When I bought the brake, it was not supplied with the gear but it wasn't obviously different so I just installed one from another brake.
That seemed to work fine, but eventually the speedo stopped working, and investigation revealed a chewed up drive gearbox at the wheel, and then I discovered the cause.
I have no idea how to obtain a correct factory replacement, which may involve changing the bigger worm gear on the hub as well.
If anyone knows who sold these 180mm 4LS Grimeca brakes, I'd be grateful for a lead to a possible supplier of the proper gears.