1975 front brake master cylinder rebuild question


Information and questions on GL1000 Goldwings (1975-1979)
  • Sponsored Links
User avatar
scotterichmond
Posts: 613
Joined: Fri May 06, 2011 3:49 pm
Location: Marblemount,wa
Motorcycle: 1975 GL1000
[img]http://images.goldwingdocs.com/scotterichmond_32376/Modestly_restored_1975_GL1000_750/engine_repainted_even_new_embl_3919.jpg[/img]

1975 front brake master cylinder rebuild question

Postby scotterichmond » Tue Jul 10, 2012 1:19 pm



I just rebuilt the front master cyclinder on my 75 GL1000. the kit included everything I took out.
There was a check valve in the OEM and the same in the kit. I reassembled as per the pictures in the OEM manual, (which was the same as it came apart) .
question is, why does it stay applied and not let loose, till I release the fluid manually.
I have looked and looked at the OEM parts list and the manual, I do not see any check valve in the pictures. It is mounted on the end of the spring.
I don't think it really is supposed to be there .
Attachments



User avatar
scotterichmond
Posts: 613
Joined: Fri May 06, 2011 3:49 pm
Location: Marblemount,wa
Motorcycle: 1975 GL1000
[img]http://images.goldwingdocs.com/scotterichmond_32376/Modestly_restored_1975_GL1000_750/engine_repainted_even_new_embl_3919.jpg[/img]

Re: 1975 front brake master cylinder rebuild question

Postby scotterichmond » Tue Jul 10, 2012 2:09 pm

I don't see that check valve in the picture
Attachments

User avatar
scotterichmond
Posts: 613
Joined: Fri May 06, 2011 3:49 pm
Location: Marblemount,wa
Motorcycle: 1975 GL1000
[img]http://images.goldwingdocs.com/scotterichmond_32376/Modestly_restored_1975_GL1000_750/engine_repainted_even_new_embl_3919.jpg[/img]

Re: 1975 front brake master cylinder rebuild question

Postby scotterichmond » Tue Jul 10, 2012 2:32 pm

Well, I found an older OEM manual that says "check valve,1975-1977 only" with a picture, just the way I assembled it. calipers have been rebuilt too. there was't any locked up front brakes till I rebuilt it
so I guees I wil have to take it aprt and see if "I" did something stupid.

User avatar
scotterichmond
Posts: 613
Joined: Fri May 06, 2011 3:49 pm
Location: Marblemount,wa
Motorcycle: 1975 GL1000
[img]http://images.goldwingdocs.com/scotterichmond_32376/Modestly_restored_1975_GL1000_750/engine_repainted_even_new_embl_3919.jpg[/img]

Re: 1975 front brake master cylinder rebuild question

Postby scotterichmond » Tue Jul 10, 2012 3:59 pm

I case you are interested I did solve the problem, I will share:

I did not buy an OEM kit, ok there might be a problem with the after market kit, ( there was)
the check valve does belong there on the 1975-1977, but there is supposed to be a small groove dimpled into the flat sealing surface on the check valve, not deep enough to releive the pressure on the after market valve, fixed that9 (made a deeper groove.

Also I saw scuffing on the lands of the new piston. ( that shouldn't be there) so I mic'd the new piston and compared it to the OEM piston, well wouldn't you know it.003 inch bigger( that won't work)
put it in the lathe and turned it down to the same as OEM, re-assembled and BAMM ! it works perfect!

another lesson learned , this Scotsman has to buck up and buy OEM (only $13 more )

Scott




Return to “GL1000 Information & Questions”




Who is online

Users browsing this forum: aegeanrider and 2 guests