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Hand Brake Master Cylinder 12 mm

Excellent braking power for 2 piston calipers and single discs or Cannonball hydraulic drum brakes for Springer forks.

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These articles can be used with either DOT4 or DOT5 brake fluid. Nevertheless, DOT4 and DOT5 should never be mixed, due to being chemically not compatible. One should always stay with the same brake fluid type.
Brake Fluids

Brake Fluids

On your brake fluid bottles you will find notes like: "corresponds to DOT 3" or "specified according to DOT 5", or similar. These notes are important to us bikers. For basically, the biker should always refill what's already in his brakes. Don't mix! So why is that so?

There are two chemical bases you make brake fluids from. One is called glycolic ester. The other one is a silicone oil. Both are by no means compatible. If you mix brake fluid made from one base with its opponent made from the other base, you will get a highly aggressive mixture, that nibbles on your brake system's rubber gaskets and can coagulate to lumps that will eventually block your brake sytems. Not the stuff you will ever want to see in your bike ...

So, why are there two bases, and can't we agree on just one?

Brake fluids on a glycolic ester base are not compressible. That means they transfer pressure better. This is an important fact when you need a precise pressure point. E.g. on the race track or on a high power bike. On the other hand, these fluids are hygroscopic, that means they attract and incorporate water from the ambient air. This lowers the boiling point and you can experience problems under high brake stress, on the race track or when heading down passes in the Swiss Alps. Because of this you have to change this kind of brake fluid every two years. Glycolic ester based brake fluid is not nice to paint or plastic either. So don't spoil it on a refill. And choose only rep kits that can handle the stuff.

Silicone based brake fluid does not have these disadvantages. This is why it was invented in the 70es. Instead it is compressible to a certain degree, and you will have a less defined pressure point. So keep the stuff out of ABS systems. And, in some cases, water was found to literally deposite down in the brake calipers. Because water and silicone don't mix and silicone floats. And of course these brake systems also breathe the ambient air and take up water. The fluid just doesn't incorporate it. Therefore please change your silicone based brake fluid also regularly.

The glycolic ester based fluids are classified according to DOT 3, 4 and 5.1 . Silicone based brake fluids are only avilable as classified according to DOT 5. This is the point where confusion can start and lead the all too money-saving biker to risky action. So, once again, don't mix!

Harley used DOT 3 up to September 1976, after that they prescribed DOT 5. In the years 2005 - 2008 the factory returned to using DOT4, depending on models:

Touring 2005, Dyna 2006, Softail and V-Rods 2006, XL 2007, XR 2008.
Hand brake master cylinder »Deluxe« by Kustom Tech, hydraulic, for handlebars Ø: 1 ”, piston Ø: 12 mm, required brake fluid: DOT 4 or 5, thread: M10 x 1.0, Italy
W&W# Picture Price incl. VAT* Available from warehouse Germany?
29-487 Hand Brake Master Cylinder 12 mm aluminum, polished 333.20 € each
in stock
29-499 Hand Brake Master Cylinder 12 mm aluminum, satin finish 333.20 € each
in stock
29-588 Hand Brake Master Cylinder 12 mm aluminum, bare 315.35 € each
in stock
29-486 Hand Brake Master Cylinder 12 mm brass / aluminum, polished 333.20 € each
in stock
29-493 Hand Brake Master Cylinder 12 mm brass / aluminum, satin finish 333.20 € each
in stock
27-952 Hand Brake Master Cylinder 12 mm aluminum, black anodized 374.85 € each
in stock
28-379 Hand Brake Master Cylinder 12 mm brass / aluminum, bare 315.35 € each
in stock
* The price includes German VAT (19% or reduced rate of 7% for Books).

Spare parts:

Accessories:

  • Bel-Ray Brake Fluid

    Bel-Ray Brake Fluid Specifically developed for the use in motorcycle brake systems and absolutely harmless for paint and plastic parts. The silicon based DOT 5 brake fluid is the ...

  • Kustom Tech Button Switch Clamp

    Kustom Tech Button Switch Clamp These clamps with integrated microswitch fit all DeLuxe line and Classic line master cylinders and clutch/brake lever assemblies by Kustom Tech.

  • Kustom Tech Handlebar Rings

    Kustom Tech Handlebar Rings With these handlebar rings you can achieve a smooth transition between grips and handlebars. Particularly recommended when installing Custom controls without ...

See also:

Have any questions?

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