-. Complete description of the product (square rear caliper trim OTK - Original manufacturer's brake cup)

Restore the bite and safety of your braking system with the official square rear caliper trim OTK. This original brake cup is a vital hydraulic spare part, specifically designed to ensure the perfect containment of the brake fluid under pressure around the pistons of your rear caliper.

As highlights the photo, this joint is distinguished by its square section. Unlike a simple round O-ring, the square profile offers a flat contact area and maximized against the piston wall and the internal housing of the caliper. This technical geometry allows the seal to deform slightly during the pressure on the pedal to accompany the movement of the piston, then to "recall" in place during the release. Designed in a high-end elastomer resistant to extreme temperatures and chemical aggressiveness of hydraulic fluids, this seal removes liquid leaks and prevents air from entering the circuit.

- The trick in Michel (the corner of the expert)

* "Hi air bubble trappers! The rear brake cup with square section of OTK, It is the centerpiece that separates an ultra-farm brake pedal from a short-line catastrophe. We see it clear and smooth on the photo file. If you notice that the liquid level drops in your pump, or the back of your platelets is fat, do not look: your square trim are tired or cooked by heat.

My mechanical trick essential to replace your original cups: dot lubrication and the direction of assembly !

When you dismount your bracket to remove the pistons, clean the inside of the brake cleaner and make sure there is no white crust deposit or brake dust. The housing must be nickel.

When inserting your new square trim, never go up dry ! Dip it generously in clean brake fluid (DOT 4 or the fluid recommended by OTK). This will prevent the seal attending or tears up when you are going to repel the piston in its bore. Insert the straight piston, without forcing like a deaf. And one last tip: Enjoy it to completely purge your circuit with new liquid. Braking OTK well repackaged, it's a max of trust each turn! "*

-. Hydraulic Replacement Guide: Step by Step

- SEO FAQ (Frequently Asked Questions)

Q: Is this article sold individually or by complete kit for the whole caliper ?

A: This square rear caliper trim OTK is sold to unity (1 piece). Because a modern karting rear caliper (like the BSD system generally uses two pistons, we strongly advise you to control these joints in pair (quantity of 2) to redo the complete tightness of your brake block at the same time.

Q: Can we use this square cup with any brake fluid ?

A: This original seal OTK is formulated to be perfectly compatible with standard synthetic brake fluids type Dot 4. Never use mineral fluids or unsuitable solvents under pain to see the rubber of the cup swell, disintegrate and instantly block your pistons on the track.

Q: What is the difference between this square trim and a classic round piston seal ?

A: As noted on the image, the seal has straight angles (square section). This form is specifically calibrated for the groove of the brand's stirrups OTK. It provides not only a much more resistant anti-leak barrier facing the high pressure generated in the race, but it also guarantees the optimal mechanical recoil of the piston to prevent the pads from lick the disk in a straight line.