Author Topic: SRAM Guide R sticky lever piston  (Read 265 times)

Tim Hall

  • Victoria is my queen
SRAM Guide R sticky lever piston
« on: 15 May, 2024, 09:23:50 am »
The Pino is fitted with SRAM Guide R brakes. In hot weather the (nylon) piston in the brake lever expands and sticks, which can led to the brake binding on.  This is a known fault and I understand that when it was first discovered there was a swap out programme.  Current Guide brakes have a slightly smaller piston and don't suffer from this.

Having watched a handful of YouTube videos I'm now a world expert familar with the basics of dismantling the lever and either replacing the piston or sanding it down a few thou. The actual sealing against the hydraulic fluid is done by , umm, seals.  The trickiest bit of the whole operation seems to be getting a snap ring out but I've identified a cheap set of snap ring pliers from Screwfix that other people have used succesfully.

Has anyone on here attempted this? How much fun was it?
There are two ways you can get exercise out of a bicycle: you can
"overhaul" it, or you can ride it.  (Jerome K Jerome)