I did try stainless caliper pistons on my original brake set up when refurbishing but after repeated stripping and trying again never got the pistons to release properly , although doesn't mean you won't have better luck. I have found that a lot of the replacement stainless caliper pistons will not work correctly because they have the wrong surface finish, and can have a chamfer instead of a radius, thus damaging the caliper seal on fitting.
Some of the new master cylinders can allow too much lever travel before they start to move the caliper piston. The sleeve kits that are available for these master cylinders are superior in this respect as they are adjustable.
The system was designed for Dot 3 fluid, Dot 4 is perfectly ok. Change fluid every couple of years. Fluid squirting from the hole in the master cylinder shows it is working ok and is not restricting the fluid returning to the reservoir. Remove the caliper when bleeding the system and position the bleed screw at the top to allow the trapped air to easily bleed out. Use a Gunsons Easibleed or similar, makes it a bleeding doddle!
Remember to pack the caliper with a dummy brake disc when bleeding the brake this way, otherwise you will pop the pistons from the caliper bore. Any suggestions as to a alternative bleeding method would be appreciated. Be aware that using fluid other DOT 4 can cause the seals to swell a third larger, and that will jam the pistons, if anyone wants photos, I have them, it is scary.
If you are using a 13mm conversion then you need to fill the system correctly, a doddle on a pre-MK3 and a pain on a MK3, But even on the MK3 you should be able to get a working brake in less than 15 minutes.
It is due to the fill and bleed drillings in the caliper and the way they are orientated when fitted on the left and right hand sides. Have you changed anything else? See my previous comments regarding bleeding the system, Ashley makes the point of the mk 3 being awkward to bleed. To make bleeding the mk3 brake easy, remove the caliper from the fork leg.
This entails unbolting the mudguard brace and pipe bracket and flexing the brace inwards to free the caliper and pipe complete. This allows you to position the bleed screw uppermost. See my previous comments about piston surface finish. Quick-change discs provide exceptional grinding, deburring and blending flexibility in smaller areas with a twist-on and -off fastening system.
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Our discs resist loading, cut aggressively and are excellent for finish removal on various types of wood. A strong backing resists tearing and provides a softer cut to eliminate picture framing. I wouldn't rush to getting it ground. After it is stripped, mount the disk on the wheel and try it. If the chrome is good, there is every chance the disk will run true. Roadscholar's advice to "clock" the rotor is sound, as you will probably be able to reduce the runout. Joined Dec 20, Messages 2, Joined Jul 11, Messages 4, Get rid of the original disc all together, buy a new one or upgrade to a better disc or a complete new system, your brakes are your life so spend the money and upgrade, my original front brakes let me down after complete rebuild and I didn't take notice and still tried to make the original bakes work better but the second time they let me down again and could have been worst than what happened still walked away with my first broken bones and while recovering I upgraded to a full new Grimica front brake system and now I have full modern brake system that is as good as my modern Triumph Thruxton brakes.
Tom Tokarz at True disc does topnotch work - did some rotors for me and I can recommend him unequivocally but as the O P is halfway around the world he may be able to find someone closer. As to clocking the rotor, indeed a benefit- IF you are not having it ground by the Blanchard process. The process includes truing the mating surface where the rotor meets the hub and producing both vertical planes of the rotor parallel AND perpendicular to the axis of rotation - important in non - floating systems as employed by the original front brake.
RoadScholar said:. I don't disagree, but the less you ask a floating disk to "float" the better the braking; I check those as well. You must log in or register to reply here. Similar threads. Replies 32 Views 2, Nov 5, joe czech. Esmerela Jun 23, Triumph. Replies 2 Views Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website.
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