What kind of caliper does BMW 1977 r100r have?
The procedure for the 1977 R100RS is the same as for the 1975 R75/6 except there are two calipers to rebuild. The 1975 R75/6 has 38 mm diameter caliper pistons while the 1977 R100RS has 40 mm pistons. The 38 mm caliper has no marks on the outside of the caliper while the 40 mm ones have “40” inscribed into them.
Can a 1977 BMW R100RS master cylinder be rebuilt?
The procedure to rebuild the 1977 R100RS master cylinder is the same as for the 1975 R75/6. You will find the procedure here. When I removed the master cylinder, I checked the bore the piston sits in for signs of rust. This is common if the brake fluid is not changed as it absorbs water which will collect in the master cylinder bore and rust it.
What’s the timing mark on a BMW r100r?
Since this engine has heads with dual plugs, the ignition timing changes from the stock settings. Since there are two flame fronts expanding across the cylinder it takes less time to burn the mixture. This bike has the 6 Deg “S” timing mark with a line above and below the “S” mark.
How to restore front disk brakes on BMW r100r?
I use a clean blue shop towel to mop up the last bit of brake fluid out of the master cylinder reservoir. I remove the front brake cable from the master cylinder by loosening the large screwed ferrule to slacken the brake cable far enough to remove the barrel from the fingers of the master cylinder lever.
The procedure to rebuild the 1977 R100RS master cylinder is the same as for the 1975 R75/6. You will find the procedure here. When I removed the master cylinder, I checked the bore the piston sits in for signs of rust. This is common if the brake fluid is not changed as it absorbs water which will collect in the master cylinder bore and rust it.
Are there front disk brakes on a 1977 BMW r100r?
The procedures for the 1977 R100RS are the same as those for the 1975 R75/6 project with the exception of the brake lines and the master cylinder. The R75/6 has a single front disk while the R100RS has two. You can read about the procedure here.
What kind of caliper does BMW 1977 R75 / 6 have?
The 1975 R75/6 has 38 mm diameter caliper pistons while the 1977 R100RS has 40 mm pistons. The 38 mm caliper has no marks on the outside of the caliper while the 40 mm ones have “40” inscribed into them. There is no left or right caliper as the same caliper will fit on either side.
Are there two front disk brakes on a BMW R75 / 6?
The R75/6 has a single front disk while the R100RS has two. You can read about the procedure here. I remove the gas tank to access the master cylinder mounted on the spine tube. I open the bleed screws on the calipers and pump the front brake lever to flush the old brake fluid out of the master cylinder.