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My Recent Posts · (04/30/08

Could you run a (single) front and a (single) rear disc brake off the same handlebar-mount master-cylinder (a MC made for dual disc obviously)? What would be the downside of having the brakes linked like that? Obviously you lose the seperate'ness of function but any other downside? Would adding a proportioning valve make it work better?

My pops had a BMW tourer- when you squeezed the brake-lever it activated both front and rear- seemed to work great.?.?.

My Recent Posts · (04/30/08

Probably need a proportioning setup , Goldwings used to have them , but that was from the rear MC . I don't know about doin it from the bars .

Kenny

My Recent Posts · (04/30/08

Seems to me a guy in NC used to run his bike like that. Bathrrom Monkey? I think that was his name, haven't seen him in a while on here. I don't think he ran a valve either, I do remember there being some discussion about safety, but that is all I remember.

My Recent Posts · (05/01/08

Bathroom Monkey is @ The Chopper Underground

My Recent Posts · (05/01/08

chalfa.......we use proportioning valves for the brakes on the race cars.........same difference.......here's a diagram of how to use it on a bike................

My Recent Posts · (05/01/08

"Seems to me a guy in NC used to run his bike like that. Bathrrom Monkey?"
"Bathroom Monkey is @ The Chopper Underground"

Well, I'm not sure if I wanna follow in the footsteps of a guy named "Bathroom Monkey" but anyways........

"I do remember there being some discussion about safety, but that is all I remember."

I'm with ya on the decreased safety over a two-mc system. But how unsafe would it really be? Kinda all relative isn't it? I mean yes, less safe than stock dual mc setup- but when compared to guys running mini-drum/mini-disc up front and a drum rear? Or compared to running only a rear-brake? Seems to me that with quality lines, rebuilt master/ calipers, and constant inspection it should be safe enough.(?). I was just thinkin' it'd make for a clean and cheap brake/control setup on a "not-exactly-a-touring-bike" chopper.

Unk' - thanks for the info/diagram- did you just draw that up, or have you or someone else done it on a bike? Hey BTW- have you ever seen one of these (from the nascar world)? I used to assemble them (as well as water-pumps) as a kid in Howard Stewarts' basement (was best friends with his son). Wonder if I could still find one of those (I think he may have stopped making 'em) and use it?

My Recent Posts · (05/02/08

I think the safety issue is getting the proper amount of pressure going to each brake.........

I personally would want more on the rear than the front.....but I end up on gravel roads sometimes.......front brakes and gravel can be a bad combination.

if you get the proper size M/C, and caliper bores, then it should be fine.....I mean, BMW, and Hond have already proven it works.

My Recent Posts · (05/02/08

I think some of the more modern bikes have the brakes split between front and back like the VTX. You might check into that. We built a bike for a guy who wanted his brakes on the handlebars like a bicycle. We warned him but he wanted it anyway. The bike was unrideable. I knew a guy who put two master cylinders on his right fwd control - one for front and one for back.

My Recent Posts · (05/02/08

"You might check into that. We built a bike for a guy who wanted his brakes on the handlebars like a bicycle. We warned him but he wanted it anyway. The bike was unrideable."

You say "unrideable". What exactly do you mean? I'm trying to picture what slow-speed manuvering would be like with front/rear-linked-brakes (and no option of rear only braking). Was that the issue? I'm still pretty green- not tryin' to reinvent the wheel or anything- def. don't want a "unrideable" bike!

My Recent Posts · (05/03/08

A friend of mine did a setup with a proportioning valve off the rear master cyl, after about a month of messing with it, trying to get the balance right, he gave up and reworked it back to a standard setup. I don't remember the exact valve he used, but I remember it was one of the expensive ones and it had a control knob on it so you could make fast adjustments, as I recall, he was always adjusting the valve trying to get a decent feel to the brakes.

My Recent Posts · (05/03/08

I think one of the main problems is the master cylinder's limitations.
A bike cyl is a single source device. and the cage cyls have two pressure sources.

Personally, after owning a stroked rigid sporty with Hurst Airhart rear brakes I'm glad
bikes have separate front and rear brakes.

:rolleyes I couldn't sell that bitch fast enough.

Author	Comment
Chalfa1980	Front & Rear Disc Brakes off one Master?	Lead	[-]
Posts: 1406 (04/30/08 1:44 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	Could you run a (single) front and a (single) rear disc brake off the same handlebar-mount master-cylinder (a MC made for dual disc obviously)? What would be the downside of having the brakes linked like that? Obviously you lose the seperate'ness of function but any other downside? Would adding a proportioning valve make it work better? My pops had a BMW tourer- when you squeezed the brake-lever it activated both front and rear- seemed to work great.?.?.
snuffymanson		#1	[-]
Posts: 3860 (04/30/08 2:18 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	Probably need a proportioning setup , Goldwings used to have them , but that was from the rear MC . I don't know about doin it from the bars . Kenny
Javahut		#2	[-]
Posts: 3186 (04/30/08 5:17 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	Seems to me a guy in NC used to run his bike like that. Bathrrom Monkey? I think that was his name, haven't seen him in a while on here. I don't think he ran a valve either, I do remember there being some discussion about safety, but that is all I remember. H.C.C.M.F. Local 6978
vtxman		#3	[-]
Posts: 300 (05/01/08 4:51 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	Bathroom Monkey is @ The Chopper Underground I woke this morning and got myself a beer. yeah,I woke this morning and got myself a beer. The futures' uncertain and the end is always near !! ( Jim Morrison )
unkle fester		#4	[-]
Posts: 319 (05/01/08 4:05 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	chalfa.......we use proportioning valves for the brakes on the race cars.........same difference.......here's a diagram of how to use it on a bike................
Chalfa1980		#5	[-]
Posts: 1414 (05/01/08 9:28 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	"Seems to me a guy in NC used to run his bike like that. Bathrrom Monkey?" "Bathroom Monkey is @ The Chopper Underground" Well, I'm not sure if I wanna follow in the footsteps of a guy named "Bathroom Monkey" but anyways........ "I do remember there being some discussion about safety, but that is all I remember." I'm with ya on the decreased safety over a two-mc system. But how unsafe would it really be? Kinda all relative isn't it? I mean yes, less safe than stock dual mc setup- but when compared to guys running mini-drum/mini-disc up front and a drum rear? Or compared to running only a rear-brake? Seems to me that with quality lines, rebuilt master/ calipers, and constant inspection it should be safe enough.(?). I was just thinkin' it'd make for a clean and cheap brake/control setup on a "not-exactly-a-touring-bike" chopper. Unk' - thanks for the info/diagram- did you just draw that up, or have you or someone else done it on a bike? Hey BTW- have you ever seen one of these (from the nascar world)? I used to assemble them (as well as water-pumps) as a kid in Howard Stewarts' basement (was best friends with his son). Wonder if I could still find one of those (I think he may have stopped making 'em) and use it?
71CHOP		#6	[-]
Posts: 10271 (05/02/08 5:24 AM) G.O.T.F. Member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	I think the safety issue is getting the proper amount of pressure going to each brake......... I personally would want more on the rear than the front.....but I end up on gravel roads sometimes.......front brakes and gravel can be a bad combination. if you get the proper size M/C, and caliper bores, then it should be fine.....I mean, BMW, and Hond have already proven it works.
Duncan Idaho		#7	[-]
Posts: 641 (05/02/08 9:53 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	I think some of the more modern bikes have the brakes split between front and back like the VTX. You might check into that. We built a bike for a guy who wanted his brakes on the handlebars like a bicycle. We warned him but he wanted it anyway. The bike was unrideable. I knew a guy who put two master cylinders on his right fwd control - one for front and one for back.
Chalfa1980		#8	[-]
Posts: 1416 (05/02/08 10:05 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	"You might check into that. We built a bike for a guy who wanted his brakes on the handlebars like a bicycle. We warned him but he wanted it anyway. The bike was unrideable." You say "unrideable". What exactly do you mean? I'm trying to picture what slow-speed manuvering would be like with front/rear-linked-brakes (and no option of rear only braking). Was that the issue? I'm still pretty green- not tryin' to reinvent the wheel or anything- def. don't want a "unrideable" bike!
woogaus		#9	[-]
Posts: 498 (05/03/08 6:08 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	A friend of mine did a setup with a proportioning valve off the rear master cyl, after about a month of messing with it, trying to get the balance right, he gave up and reworked it back to a standard setup. I don't remember the exact valve he used, but I remember it was one of the expensive ones and it had a control knob on it so you could make fast adjustments, as I recall, he was always adjusting the valve trying to get a decent feel to the brakes. Having fun, whether the man likes it or not!!! Woogaus Domain Winnie's Creations
rakeNtrail		#10	[-]
Posts: 740 (05/03/08 6:29 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	I think one of the main problems is the master cylinder's limitations. A bike cyl is a single source device. and the cage cyls have two pressure sources. Personally, after owning a stroked rigid sporty with Hurst Airhart rear brakes I'm glad bikes have separate front and rear brakes. :rolleyes I couldn't sell that bitch fast enough.

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Front & Rear Disc Brakes off one Master?

Front & Rear Disc Brakes off one Master?

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