3 way assembly 60/40 splittter on rear brake line


Information and questions on GL1100 Goldwings (1980-1983)
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83gl1100nb
Posts: 39
Joined: Sat Feb 26, 2011 1:29 am
Location: Bothell, Wa.
Motorcycle: 83honda GL1100 Aspencade
95 Concours
82 Nighthawk

3 way assembly 60/40 splittter on rear brake line

Post by 83gl1100nb »



has anyone rebuilt one of these? mine was leaking brake fluid out the back, where the 3 way was screwed to the mounting plate. took it apart & looked like there was just a silicone sealant as the gasket. just checking if this can be put back together & function. couldn't find a parts diagram on the parts manual.
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83gl1100nb
Posts: 39
Joined: Sat Feb 26, 2011 1:29 am
Location: Bothell, Wa.
Motorcycle: 83honda GL1100 Aspencade
95 Concours
82 Nighthawk

Re: 3 way assembly 60/40 splittter on rear brake line

Post by 83gl1100nb »

ps. this is a real bear to get out. i guess that's redundant. most everything on these bikes is fairly hard to get at.

83gl1100nb
Posts: 39
Joined: Sat Feb 26, 2011 1:29 am
Location: Bothell, Wa.
Motorcycle: 83honda GL1100 Aspencade
95 Concours
82 Nighthawk

Re: 3 way assembly 60/40 splittter on rear brake line

Post by 83gl1100nb »

from a little digging, i guess it's called a pressure control valve. it splits the brake pressure between the front & rear rotors. manual says it's not serviceable. i think i've seen people say that they have abandoned this. has anyone ran into that? i was thinking about just running the rear brake line to the rear rotor & maybe try to hook the other (front) brake line into the front brake master cylinder. does anyone have any ideas on this? thank you.

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newday777
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1983 GL1100A Wineberry 36,000 miles

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Re: 3 way assembly 60/40 splittter on rear brake line

Post by newday777 »

83gl1100nb wrote:
Wed Oct 07, 2020 12:51 am
from a little digging, i guess it's called a pressure control valve. it splits the brake pressure between the front & rear rotors. manual says it's not serviceable. i think i've seen people say that they have abandoned this. has anyone ran into that? i was thinking about just running the rear brake line to the rear rotor & maybe try to hook the other (front) brake line into the front brake master cylinder. does anyone have any ideas on this? thank you.
I opened mine up 12 years ago when I was bringing the 83 back to life from a 13 year sleep in a high heat storage/abandonment. I don't remember what the gasket looked like but I did clean out the old hardened dot3 gunk to get it operating again.
You could abandon it and plumb a line just to the rear caliper....but..... The rear wheel will skid easily from too much pressure.
On the front you will need to get a different master cylinder designed for dual calipers to be effective. The 82 front master cylinder is set up for 2 calipers, but remember your right caliper has smaller pistons(part of the linked brake proportional equation) than the left front caliper has, so to have equal forces on each rotor you might want to put the 82 right front caliper on your bike to make it a true 82 front brake system. Is that necessary? I don't know for sure. I was a parts manager and don't have the full technical knowledge of the hydraulic forces, just the limited learning I've garnered over the past 12 years.

I have read posts of using the rear master cylinder off a gl1800(lots available from parts strippers) and making a bracket to mount it to the frame on the 83 to eliminate the splitter as you are wanting and still have the linked rear and right front calipers and it has a little more pressure to give better brake power. The 1800 rear master cylinder is designed to proportion internally. This is not a plug and play option but doable if you are mechanical.

What ever you choose to do, if you change out parts to other parts, take good notes to pass on to future owners for when they need to work on the brakes as the 83 brakes have a lot of 1 year only parts and ordering rebuild kits will bite someone later on......

83gl1100nb
Posts: 39
Joined: Sat Feb 26, 2011 1:29 am
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82 Nighthawk

Re: 3 way assembly 60/40 splittter on rear brake line

Post by 83gl1100nb »

Thanks for the info! I’ll try and put it back together after cleaning up, see if it holds up. Weird thing was that there was no gasket material, only a thin layer of what looked like silicone sealant. If not, I’ll try just going with the individual rear & front brakes &!see how those feel. Thank you

83gl1100nb
Posts: 39
Joined: Sat Feb 26, 2011 1:29 am
Location: Bothell, Wa.
Motorcycle: 83honda GL1100 Aspencade
95 Concours
82 Nighthawk

Re: 3 way assembly 60/40 splittter on rear brake line

Post by 83gl1100nb »

tried it after cleaning up & reinstalling, but it failed on the first ride around the block. leaked again. i'd be interested if anyone has tried the gl1800 rear master cylinder conversion, would like to see how that looks. the pcv is no longer available as a part.



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