KevinV Posted January 20, 2009 Posted January 20, 2009 I noticed the other day that the pistons on my (Shimano Deore) rear brake are not retracting completely. Is the fix as simply as spraying a bit of lube in there? Obviously I need to avoid lubing the braking surfaces, so can I simply remove the wheel and pads, spray, then reassemble and pump the brake?
Mudsimus Posted January 20, 2009 Posted January 20, 2009 Dont spray it with lube. You'll cause a bigger mess. Rather clean it with a disc cleaining spray. Wurth makes a very nice one.
KevinV Posted January 20, 2009 Author Posted January 20, 2009 Thanks Mud Dee, I assume I can buy this at a motor spares shop like Midas?
martelpypie Posted January 20, 2009 Posted January 20, 2009 Check, there may be a small stone stuck in it
Mudsimus Posted January 20, 2009 Posted January 20, 2009 Thanks Mud Dee' date=' I assume I can buy this at a motor spares shop like Midas?[/quote'] I'm sure you can.
KevinV Posted January 20, 2009 Author Posted January 20, 2009 Check' date=' there may be a small stone stuck in it[/quote'] Thanks, will look but both are sticking so I think it's probably grime.
Wyatt Earp Posted January 20, 2009 Posted January 20, 2009 You could also ask your LBS for a bit of mineral oil, the Shimano brake fluid. Remove the pads then pull the brake lever to get the pistons to come out a bit more. Grab an earbud with some meth and clean around the piston, push the pistons back and get some of the mineral oil to penetrate between the piston and the caliper.
KevinV Posted January 20, 2009 Author Posted January 20, 2009 You could also ask your LBS for a bit of mineral oil' date=' the Shimano brake fluid. Remove the pads then pull the brake lever to get the pistons to come out a bit more. Grab an earbud with some meth and clean around the piston, push the pistons back and get some of the mineral oil to penetrate between the piston and the caliper.[/quote'] Thanks guys, gonna spend some quality time with my bike after work.
KevinV Posted January 27, 2009 Author Posted January 27, 2009 I finally got around to sorting the brakes out. Been resting a strained achilles so my bike has been rather lonely. Just to give feedback, I got some mineral oil from my LBS and sorted it out. The pistons now retract nicely. Thanks to all who gave me input.
KevinV Posted January 27, 2009 Author Posted January 27, 2009 Good news Kevin What method did you use ? I removed the pads, loosened the bolts holding the caliper onto the frame and removed the caliper to get it away from the rotor. I then applied a small amount of mineral oil around the edges of the piston and pumped the brake lever. This done, I pushed the pistons all the way back with a plastic tyre lever and reassembled. The pistons now retract completely. The brake lever, however, seems to have more travel than the other one. Does the oil reservoir perhaps need to be topped up?
Wyatt Earp Posted January 27, 2009 Posted January 27, 2009 Good news Kevin What method did you use ? I removed the pads' date=' loosened the bolts holding the caliper onto the frame and removed the caliper to get it away from the rotor. I then applied a small amount of mineral oil around the edges of the piston and pumped the brake lever. This done, I pushed the pistons all the way back with a plastic tyre lever and reassembled. The pistons now retract completely. The brake lever, however, seems to have more travel than the other one. Does the oil reservoir perhaps need to be topped up?[/quote'] Hi Kevin It might need a top up, how worn are the pads.
KevinV Posted January 27, 2009 Author Posted January 27, 2009 Pads are still in quite good shape. How simple is it to top up?
KevinV Posted January 28, 2009 Author Posted January 28, 2009 Pads are still in quite good shape. How simple is it to top up? JB? Anyone?
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