Brakes

[Lucky_Lou]

My 79 has ATE brakes with the round reservoir it has twin discs which are drilled, My brothers 81 has Brembo with the square reservoir twin discs which are solid? you would have thought the newer one would be drilled.
Lou

[Bob_Roller]

Looking at the fasteners that hold the rotor to the hub, they don't look like any of the solid rivets on any of my R65's .

Kind of hard to tell from the picture, but the solid rotors look like they have rust on them, are they steel, and not stainless ?

[montmil]

My 1981 R65, with a single front disc brake, has a drilled brake rotor. Ditto on the 1983 R65.

Also, both the '81 and '83 have the rotors attached by rivets with smooth, flat "shop heads". The rotor attach hardware on your brother's bike appears to be Allen screw heads with nuts on the backside of the mounting flange. These may not be stock BMW components.

Did your bro' purchase the bike with these rotors?

Monte

[Lucky_Lou]

Looking at the fasteners that hold the rotor to the hub, they don't look like any of the solid rivets on any of my R65's .

Kind of hard to tell from the picture, but the solid rotors look like they have rust on them, are they steel, and not stainless ?

Mine (79) are stainless and riveted im pretty sure the 32k miles are correct on it, my bothers 81 are bolted on and not stainless and undrilled it has 85k on the clock so its possible they have been replaced at some point.
Lou

[Landlubber]

...yep, cast iron rotors for sure, nothing wrong with bolt ons....they do rust I suppose, but they work well, and that is sort of important for brakes....my old Ducatis have the same setup.

[nhmaf]

Yours (79 bike) appear to be OEM/factory, while the other solid rotors might be EBC-sourced cast iron replacements - there are one or two other sources of 'bolt on' cast iron rotors for these bikes that use the stock rotor carrier which hold the rotors onto the wheel hub - looks like what you've got on the '81.

[jay]

Lou.mines '80 with twin stainless drilled discs......just got'em skimmed,offside disc was well warped...all good now......just need to know if i need to split calipers to check/change pads.

[Bob_Roller]

No , remove the dust caps from the caliper, get a long punch tap out the pins that hold the pads in place, there's a ring, kind of like a piston ring on the outboard side of the pin, it may give you some resistance before it comes free, remove the tension spring from on top of the pads .

Remove the two bolts that hold the caliper to the fork tube .

Remove the caliper and pads .

You need to push the caliper pistons back in before re-installing the caliper .

Remember to pull the front brake lever in a few times after everything is re-installed and tightened up, or that first brake application will result in no brake action !!!!!