front brake master cylinder.


Information and questions on GL1000 Goldwings (1975-1979)
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grahamlang
Posts: 4
Joined: Sat May 03, 2014 2:19 am
Location: Manchester, England, United Kingdom
Motorcycle: gl1000 k2

front brake master cylinder.

Postby grahamlang » Sun May 04, 2014 5:32 am



hi, i am having difficulty in buying a front brake master cylinder repair kit for my gl1000 k2.i have recieved 3 off ebay up to now and all have been wrong. my piston is 17.5 mm diameter and50 mm long. it is the original unit as it matches the tech specs in the manual. it is a uk bike reg in 10/1978. vin no GL23025932. any advice would be appreciated thanks.



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Placerville
Posts: 423
Joined: Tue Mar 09, 2010 12:58 pm
Location: Placerville, CA
Motorcycle: 1976 Naked Yellow

Re: front brake master cylinder.

Postby Placerville » Sun May 04, 2014 1:17 pm

grahamlang wrote:hi, i am having difficulty in buying a front brake master cylinder repair kit for my gl1000 k2.i have recieved 3 off ebay up to now and all have been wrong. my piston is 17.5 mm diameter and50 mm long. it is the original unit as it matches the tech specs in the manual. it is a uk bike reg in 10/1978. vin no GL23025932. any advice would be appreciated thanks.

Just a tip: You may want to start referring to your GL by model year, rather than the KO, K1, K2 etc. designation as it can often confuse the issue and many get it wrong. Looking at reference material I have, I cannot tell what year GL you have as the serial # (not "VIN" number as you state) and manufacture date don't align with a 1978 GL, if that's what you have. But, for now, let's put that aside.

My first question would be, what year GL do you have? It appears you have either a '77 or a '78. The second is, why are you buying from eBay? It's a real risk with this type of purchase. I suggest you go to David Silver Spares site for this purchase.

Re-post with your year of GL and we'll go from there.
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grahamlang
Posts: 4
Joined: Sat May 03, 2014 2:19 am
Location: Manchester, England, United Kingdom
Motorcycle: gl1000 k2

Re: front brake master cylinder.

Postby grahamlang » Sun May 04, 2014 4:10 pm

hi placerville, thanks for your reply. my vin no is GL1 23025932. my log sheet states it was registerd in oct 1978 and is a k2. the honda workshop manual says the master cylinder piston is same specs as a 75-77 model. the rear indicators mount on the tail light mount the carb joining chrome brkts cover the throttle mechanisim. it is uk spec. i actualy uncrated this bike built it and pre delivery inspected it. i also carried out its first service and many others. then lost track of it till may 2013. i have bought it off its previous owner in oct 2014. i worked for a few main dealers up till 2004 when i stopped work. i dont think the unit has been replaced anc cant think of a reason why it might. the guy i got it off gave me the full history. i want to replace the seals as they have swollen and are causing the piston to return slowly. i hope this fills in the gaps.

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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: front brake master cylinder.

Postby Fred Camper » Sun May 04, 2014 4:59 pm

Are you attempting to keep the bike all stock? The stock master cylinder takes more hand strength than modern bikes and some prefer the lesser effort found with a 15mm master cylinder. But if you are keeping her stock, the brakes stop just as well that way just take more hand effort.

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Placerville
Posts: 423
Joined: Tue Mar 09, 2010 12:58 pm
Location: Placerville, CA
Motorcycle: 1976 Naked Yellow

Re: front brake master cylinder.

Postby Placerville » Sun May 04, 2014 7:28 pm

What a great story about your bike. Well, a '78 it is. What do you think about the master cylinder kit at DSS? Does it differ from your eBay kits?
Placerville- 1976 Yellow
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Rowdy
Posts: 8
Joined: Sun Jun 03, 2012 4:06 pm
Location: Grapevine, Texas
Motorcycle: 1978 GL 1000 1800 Goldwing Trike

Re: front brake master cylinder.

Postby Rowdy » Thu May 08, 2014 3:37 pm

I have a 1978 GL1000 .I found front and rear master cylinder kits at Parts N More.
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grahamlang
Posts: 4
Joined: Sat May 03, 2014 2:19 am
Location: Manchester, England, United Kingdom
Motorcycle: gl1000 k2

Re: front brake master cylinder.

Postby grahamlang » Fri May 09, 2014 2:31 pm

hi rowdy.thanks for your reply. i find the bits, they are the wrong ones.

Rowdy
Posts: 8
Joined: Sun Jun 03, 2012 4:06 pm
Location: Grapevine, Texas
Motorcycle: 1978 GL 1000 1800 Goldwing Trike

Re: front brake master cylinder.

Postby Rowdy » Fri May 09, 2014 3:11 pm

I must have got the last front master cylinder kit about six weeks ago#08-0279 . The rear was # 08-0274. Honda still have rears. You can check them later or call them . Made by Tour Max in Japan. Good luck.
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Rowdy
Posts: 8
Joined: Sun Jun 03, 2012 4:06 pm
Location: Grapevine, Texas
Motorcycle: 1978 GL 1000 1800 Goldwing Trike

Re: front brake master cylinder.

Postby Rowdy » Fri May 09, 2014 3:37 pm

OOPS found them. I looked under GL1000 1978 , still got them. Working just fine six weeks .
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grahamlang
Posts: 4
Joined: Sat May 03, 2014 2:19 am
Location: Manchester, England, United Kingdom
Motorcycle: gl1000 k2

Re: front brake master cylinder.

Postby grahamlang » Fri May 09, 2014 4:31 pm

one kit i got was a tourmax number 280057. didnt fit.

RLVitt
Posts: 2
Joined: Sun Oct 11, 2015 6:05 pm
Location: Folsom, CA.
Motorcycle: 2 1970 Honda CB750's, 1 1972 Honda CB750

Re: front brake master cylinder.

Postby RLVitt » Sun Oct 11, 2015 6:22 pm

"The stock master cylinder takes more hand strength than modern bikes and some prefer the lesser effort found with a 15mm master cylinder. But if you are keeping her stock, the brakes stop just as well that way just take more hand effort."

I'm a CB750 owner. I converted the front brake to duel discs. As part of the conversion I used a GL1000 Master Cylinder and brake manifold (to split the lower lines). I was advised that I should use the GL's M/C because it has a larger bore than the stock CB750's M/C. And that I would need that extra diameter to adequately pressure up the front disc's for stopping. What is the stock GL1000 diameters and did they ever change the diameter? I have no problem related to the amount of grip effort I use, but I want to explore getting a more solid feel to the braking effort. Right now the feel is too cushy and I would prefer a more solid feel.

Read more: viewtopic.php?t=21770#ixzz3oItE8KMt

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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: front brake master cylinder.

Postby spiralout » Tue Oct 13, 2015 12:24 am

RLVitt wrote:What is the stock GL1000 diameters and did they ever change the diameter?

11/16" I believe

RLVitt
Posts: 2
Joined: Sun Oct 11, 2015 6:05 pm
Location: Folsom, CA.
Motorcycle: 2 1970 Honda CB750's, 1 1972 Honda CB750

Re: front brake master cylinder.

Postby RLVitt » Tue Oct 13, 2015 1:22 am

spiralout wrote:
RLVitt wrote:What is the stock GL1000 diameters and did they ever change the diameter?

11/16" I believe

The two GL M/C's I have are both 11/16ths. But was that diameter ever changed to a larger or smaller diameter?

motorcyclemedic
Posts: 31
Joined: Wed Mar 10, 2010 9:52 am
Location: Anchorage alaska
Motorcycle: 1975 GL1000, 1985 GL1200A Aspy

Re: front brake master cylinder.

Postby motorcyclemedic » Thu Jun 02, 2016 9:03 am

I have a 75 wing- rather than rebuild the old ft brake Master cyl- I got one from an 85 wing- rebuilt it, and bang- I have very powerful ft brakes- 2 finger pull- WILL lock the ft wheel if you want- much better than orig- still Honda, and looks better- I also converted it to an 84 wing clutch- hyd Master cly ect- again- 2 finger pull- see my older post about this conversion- rotsa luck!! Dennis in Anchorage Ak-




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