Question about BMW R 100 RS Motorcycles

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Do you have a diagram of internals of a master cylinder

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If you know the model, year etc. you can look up BMW parts at

Max BMW

Note that the front master cylinder is under main group 32..... not under group 34

Posted on Sep 29, 2010

Testimonial: "Hi Thank you for replying It was the internal parts to the master cylinder that I wanted to see. I have a 1978 R100RS with leaky brakes Graham"

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Master cylinder diagrams


buy new! my frend had 1 of those and it was easier to buy new then to try and rebuild. the internals r a ram with rubber bushings/o-rings. and they rot!. lol.

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How do u replace the master cylinder on a 95 lincoln towncar?


  • Unplug the brake lines from master cylinder. Be careful with brake fluid spilling out, it is toxic and corrosive.If needed use a plastic container to collect fluid.
  • Disconnect electrical connectors.
  • Unscrew the nuts securing the master cylinder to the brake booster.
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Here a diagram. The master cylinder is part 10 below reservoir part 9:

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How easy is it to rebuild the front brake master cylinder on a 2003 883 Hugger?


Rebuilding the master cylinder is relatively easy. Simply purchase a rebuild kit, take the master cylinder off the bike, Take the lever off and then most of the internal parts will simply come right out. With the internals out, you'll probably need to lightly hone the bore with a flex hone of the proper size. Lubricate the parts and install them just as they came out and reassemble the master cylinder. Then bleed the cylinder, hook up the brake hose on the bike and bleed the brakes at the caliper.

Go here to see an exploded view of your front master cylinder.
http://www.bikebandit.com/2003-harley-davidson-sportster-883-standard-xlh883/o/m18404#sch609894

Good Luck
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Jan 21, 2011 | 2003 Harley Davidson XLH Sportster 883...

1 Answer

I have a 2003 electra glide classic with 2.5 in. of play in the front brake lever, is this a bad master cyl? Instructions to rebuild?


Check the master cylinder to see if the reservior is full. If not, fill with the proper type brake fluid. Then, bleed the master cylinder by loosening the banjo bolt at the end of the master cylinder, pull the lever and hold it, tighten the banjo bolt. Do this until all air is out of the master cylinder. If you still have the free play, a rebuild is required.

If your 2003 model is like the earllier models (I have rebuilt a late model like yours), take the large pivot pin out and the lever will come off. On some master cylinders, there is a snap ring that holds the internals in the master cylinder, on others, there aren't, but you must get the old internals out. Inspect the bore and hone if necessary to smooth the bore. If the bore is badly pitted, replace the assembly. Install new internals and put the lever back on. Fill with the proper brake fluid. Bleed the system of air. Warning, the brake fluid may ruin your paint if it gets on it.

Good Luck,
Steve

Sep 23, 2010 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

I need a break line diagram for 1995 ford countur


It doesn't connect to master cylinder. The line should connect to a proportioning valve, then from valve to master cylinder.Star at master cylinder and follow lines to proportioning valve.

May 25, 2010 | 1995 Ford Contour

1 Answer

Hello. i have a 1991 audi 100. brake padel has become mushy but there are no signs of brake fluid leak on the master cylinder or the lines. the brake pads are new. thanks


Just because there isn't an external leak in the brake system doesn't mean there isn't an internal leak in the master cylinder. A mushy pedal is usually an internal leak in the master cylinder or leaking wheel cylinders in the rear brake drums. Check the rear brake wheel cylinders for fluid leaks, if there are none or you do not have rear drum brakes, your best bet is the master cylinder :)

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