DT125R FORUM

    • Register
    • Login
    • Search
    • Recent
    • Tags
    • Popular
    • Users
    • Groups

    Piston upside down?

    Brakes
    4
    7
    75
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • S
      SpookDog last edited by

      I always thought that the piston was supposed to have the flat ‘head’ inside the calliper, so as to have the least amount of fluid in the calliper?

      The person who had the bike before me had it so the face was pressing against the pad. Is this the right way round?

      1 Reply Last reply Reply Quote 0
      • markus.w
        markus.w last edited by

        I think it is the right way. The recessed part is inside the calipper.

        1 Reply Last reply Reply Quote 0
        • S
          SpookDog last edited by

          Do you mean ] ]
          Or [ ]
          If that makes any sense?...

          1 Reply Last reply Reply Quote 0
          • markus.w
            markus.w last edited by

            Sorry yes I think it is right as it was. I just looked at the Haynes manual, the caliper exploded view and it shows the recess inside to sort of cup the fluid if you get me.

            1 Reply Last reply Reply Quote 0
            • Calum
              Calum last edited by

              Pretty sure I have seen both types of piston used on different vehicles. Aprilia brakes the piston is inverted compared to my MX5 brakes.

              Always Originate, Never Pirate!

              1 Reply Last reply Reply Quote 0
              • S
                SpookDog last edited by

                It’s cool. I just took the front calliper apart and the ‘base of the cup’ goes into the calliper. It has a dust boot groove around the ‘lip of the cup’ so it can only fit one way up...
                The back will be the same...

                I thought it was wrong. Haynes manual doesn’t really help either, the line drawings are ambiguous, they should have a proper photo really...

                declan 1 Reply Last reply Reply Quote 0
                • declan
                  declan @SpookDog last edited by declan

                  @SpookDog the cup should be facing the brake pad I've never seen flat side facing the pad although I don't doubt it exists the cup keeps little contact area so it's less likely for corrosion to glue the pad to the piston EDIT- emphasis on the "should"

                  1 Reply Last reply Reply Quote 0
                  • First post
                    Last post