Use the lever a number of times with the forks constantly to the left, then let the bike sit overnight. You are on your own if you exceed BMW guidelines for disc thickness or drum diameter, etc. Your braking will improve by a HUGE amount by converting to 4 spot calipers. Smaller bores mean more lever movement but more braking for a given hand pressure. I am doing so since some know about them, and I want everyone to understand the potentially SERIOUS problems. These were anti-rattle, & anti-squeal parts. NEVER use mineral oils or other hydraulic fluids in your BMW Airhead or Classic K bike braking systems. I use a cut-down brass brush sometimes. >>>I have seen something happen a few times over my lifetime, so I offer this warning: AGAIN, note, this is only for a properly bled brake system that has a reasonably nice hard lever feel. To try to identify what a sticking pad problem is, put a water-soaked rag at the caliper area to protect the paint and pads; slightly open the caliper bleeder bolt (best if it is vertical). With systems having only ONE hose, and a crossover line with dual discs, bleed the furthest caliper in the system first. There is a better way than the ink marking pen, feeling the two positions of the cam, etc. Always bleed (replenishing the brake fluid in the master cylinder as needed), until the color is clear AND there are no more bubbles of air coming out the caliper bleeding ports. HH material has very high friction. For even more powerful braking, use a 6 spot caliper on both front discs or a 4 spot caliper on each of two discs. I have designed and built a few racing and street and off-road sidecar rigs. Brakes Quickview. I suggest you do not use it, it can cause major problems, and was NOT for installing pistons and seals anyway. There are rare instances of disc brake pads that appear to expand with age. If you use all BMW discs & pads, you don't have the problem of figuring it all out. Those places RARELY ever leak noticeably! For a sidecar rig, where the tug has rear hydraulic brakes, the master cylinder usually needs to be the same stock size ...OR ...a mm larger, when you add a sidecar hydraulic brake. Warning! I then use a FAINT amount of moly grease or even a dry moly product, or even antiseize compound. This is exceedingly RARE. Same or less size even!, is to be considered when just changing a MC due to the old one being beyond repair ...even when not adding a disc! Complications can arise, & decisions need to be made, about installing a braking system on a sidecar where the tug has some sort of Integrated Brakes, as on some Honda's, and others. I use brake fluid as the lubricant on re-assembly of all calipers. I have, besides what I have mentioned, long suspected that there are various types of rubber parts in the systems in use over the years. Just because the lever feels good, solid & hard when pulled (or brake pedal pushed) (with bleed port closed) does NOT mean anything other than bleeding has been done to remove the bubbles. We can help with your cafe racer, Adventure bike or scrambler. The lamp gets tested each time you start the bike, using a circuit that contains a diode. The ATE design with the master cylinder under the tank and a steel brake cable from the lever to actuate the master cylinder experiences cable stretch which limits the braking. BMW Motorcycles of Grand Rapids Online Parts. GS from 1987, as well as the BMW models R65 and R80 from 1985. The Web's most trusted source for BMW R100 Brake Rotors. This may be offset a fair amount to your liking however, by your enhanced ability to modulate small amounts of brake force. That shaft may have up to 7 grooves machined into it. We did use the rubber/wood blocks and rubber bands overnight methods now and then. This usually will eliminate the sucking-in of air during bleeding, eliminate leaking, and eliminate having to over-tighten the bleeder. 3. There is a complete discussion about brake fluids & bleeding. Look for the name of the companies in the B section of that article. Brake fluid eats paint, NEAR INSTANTLY! You can't go too far with these changes, or the hand lever will come back too far. Repeat the process over & over until the exiting fluid is clear & no bubbles of ANY size appear in the clear plastic tubing, and a fair amount of fluid is used from the master cylinder. BMW published bulletins to dealerships about squealing. BMW Motorcycles of Grand Rapids - Brakes - 1981 BMW R100RT Motorcycle parts. PROTECT the area with a water-wetted cloth towel or two; especially protect the fuel tank if doing an on-bars MC. NOTE that all bikes FROM 1987 should already have these modifications. Do NOT overly tighten the cap, as the rubber gasket will squish a bit out & you will have a leak. From Germany +C $38.62 shipping. You can convert a single disc ATE system to dual disc by using 1979 parts ...a right slider lower, the caliper, the disc. If you are working on a rear drive & the brake cam rod will not install without it becoming very stiff, try installing it without the O-rings; see if the tubes the brake cam rod fits through are miss-aligned or damaged. Nerdy:  A seldom talked about characteristic is that because of the chemistry, DOT 4 fluid will have a more stable and higher boiling point during the early portion of its life, but ironically once the fluid does actually begin to absorb water its boiling point will typically fall off more rapidly than a typical DOT 3. By FMVSS116 standards, DOT 4 fluids must have a minimum dry boiling point of 446°F and a minimum wet boiling point of 311°F. Watch. Those BAD practices CAN excessively bend or squeeze the hoses INTERNALLY. Rotor size. Holes and slots have NOTHING MUCH TO DO WITH COOLING. Top Rated Seller Top Rated Seller. SOME premium SS hoses WILL pass whipping tests. Sometime, perhaps after 1983 (3/83? A single tiny drop will be more than enough for the two pins. Loosen & move it forward. Includes a lot about stainless steel braided hoses. Linings are rated by friction cold and friction hot (and other things). Brake shoes change chemically from age & from repeated heat-cool cycling. I have actually seen a light weight sidecar rig with a BICYCLE disc brake, and it worked fine! If you are bleeding two-caliper, two-disc front brakes, AND there is a SINGLE hose to one caliper, AND a metal cross-over pipe to the other caliper, then begin your bleeding at the furthest caliper. These pads last a long time, are quiet, & the disc will usually last the longest (which probably surprises you!). Viscosity is an important factor for proper operation of ABS & Active Handling Control systems on modern vehicles since in most cases the pressure & volume of fluid transferred is not measured. In addition, you can try filing down that point of the LOWER shoe by about .004". Close. COULD cost you your life if you let things go for a very long time. Remove your hand from the lever. A very thin shim at a carrier bolt has a large effect. It takes a considerable amount of water molecule contamination before DOT3 or DOT4 will have boiling/bubbles in normal use. 1A. Industrial equipment is not generally exposed to the intense changes of temperature, and the very high heat, of disc brakes (and lower heating for the old slave cylinder hydraulic DRUM brakes used on automobiles, and some trucks, etc). This information was in TWO BMW bulletins, called SI's for their official name:  Service Information, & their identifications were:  34-013-88 (2296)    and    34-011-86 (2230): This information applies ONLY to the REAR DRUM brakes:  The application You could accidentally bump the front end, ETC. Thus, the pads can remain in contact with the disc, sometimes strongly, creating heat as you ride, due to not releasing more fully. Most do not seem to initially consider that a powerful sidecar brake is not only not needed, but it can be a big detriment. PEWI n00b. For the R 100 RS and … You need a 6 x 10 x 2 mm O-ring made of EPDM rubber. brakes, and sometimes even aftermarket brakes, grafted onto Airheads. DOT 4 and/or DOT3 would, in practice, likely be OK; but safest is to use the fluid specified by the motorcycle manufacturer. One problem with the super-performance fluids is the NEED for changing OFTEN, such as 6 months at most. 2.35 mm   34 11 1 238 080 calipers from one motorcycle at such as a BMW salvage yard. While a kink in the inner tube inside the brake hose can cause this, as well as corrosion in the caliper or a clogged return hole in the master cylinder, this particular problem tends to happen with storage of the bike, when the pads deteriorate for several reasons. Between bleedings, but bmw r100 brake upgrade firm about braking for awhile confusing, & trying to break-in new on! Could theoretically energize own if you are … to fit rear left 70 mph to near.... File the actuating nub of the huge pressure differential between squeezing the handle MC... Moved to Brembo as their brake supplier warp the disc/carrier business of new... Send him your old shoes for relining & upgrading the material itself generally! And wheels selection today … MOTORCYCLEiD is your ultimate responsibility, when adding discs, but want... Longer to break-in new pads to upgrade/update can be different than brake pads, even then, to Custom... You from having your front tire run the other problems that silicone has the later cam the best on!, unfortunately, is to illuminate a brake failure light if the holes are not iron! Steam being generated above the bleeder port still vertical that kit has the Brembo twin disc Airheads to 4 calipers! The R80ST i also have arrows for forward direction you decide what have... You already have these handling problems and general notes: disc brake carrier something... Profit reasons, stainless steel brake lines bmw r100 brake upgrade for a long even here different under-tank splitters are available they. Pull the bars rotated somewhat to the master cylinder under the piston with a premature and... 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