Braking:New Master Cylinder, still brake problems.

[bruce_launceston]

I did the same as Teo but with floating 'Braking' discs from Italy.
It's not a difficult job at all, you only need an angle grinder and a punch and as you grind the head off on the disc side you are not damaging the disc carrier that you will be reusing.

[tvrla]

As said already, the 16mm is waaaaay too large. For a dual disc 14mm is better, and I like 13 even more. Your brakes feel like crap because the leverage is wrong. As an analogy, it's like being two feet from the fulcrum of a teeter totter trying to lift the person on the other side - it would be tough to lift even your two-year-old.

It's just a matter of leverage.

And the standard rubber brake lines work just fine - until they age and collapse internally. It's true, they've got a little more flex, but you shouldn't be working your brakes that hard anyway. Fix the source of your problem, then decide whether to replace the brake lines or not. Right now, with the over-large master cylinder, stainless lines will actually give you a stiffer lever.

And to make sure it's all very clear - the LS takes the shallow disc, the standard R65 with snowflakes takes the deep dish.

Bruce - nice LS! Like those discs!

[Milo_357]

And to make sure it's all very clear - the LS takes the shallow disc, the standard R65 with snowflakes takes the deep dish.

My '83 RS had a snowflake on the front, are you saying it is a different wheel than the '82 snowflake?  :-/

Dell

[montmil]

And to make sure it's all very clear - the LS takes the shallow disc, the standard R65 with snowflakes takes the deep dish.

My '83 RS had a snowflake on the front, are you saying it is a different wheel than the '82 snowflake?  :-/

Dell

LS wheels are not "snowflakes". Different design.

[Milo_357]

Grrreeeaat. Once again I am screwed by a failure to carefully examine the situation.  I could sworn they were the same wheel.  Cr@p.  . Do you know the width difference?

Well, guess it's back to the drawing board for me.  Probably too late to return that MC for a smaller diameter one.

Wasted money everywhere.  

[tvrla]

Re-sell it! Someone wants it.

The R65 snowflake is an 18" while your 83 RS has a 19".

[Milo_357]

But the caliper and the brake disc are the EXACT same size between the '82 & '83.  I actually put the disc on the '82 wheel and it fit perfect until I realized that the carrier depth was different & in wouldn't work because of that.  I wonder if someone put an 18 on the RS for some reason, or where the brake system just the same between them?

I am so confused...  . I am just gonna get another 83' disc and go for it.  If I can find a disc!  Hoping the local guy has one when he gets back in town...

[Teo]

Pics of replacement Ferrodo floating discs on the original /6, /7, /whatever series of disc carrier. I drilled the holes around the cup of the carrier because it was the cool thing to do many years ago.

[tvrla]

You're right - everything is the same between the R65 and the other beemers --- except the carrier depth.

The R65 has wider triple trees - and that's what's different. There's more distance between the axle mounting points, and the calipers are farther apart than other beemers.

It has nothing to do with the year beemer the disc comes from - if it's for an R65 - it's unique and must have the deeper dished carrier.

The R65LS has a different wheel and takes the normal shallower dished brake disc, so they're not interchangeable.

Does that clear up the confusion?

But the caliper and the brake disc are the EXACT same size between the '82 & '83.  I actually put the disc on the '82 wheel and it fit perfect until I realized that the carrier depth was different & in wouldn't work because of that.  I wonder if someone put an 18 on the RS for some reason, or where the brake system just the same between them?

I am so confused...  . I am just gonna get another 83' disc and go for it.  If I can find a disc!  Hoping the local guy has one when he gets back in town...