Rear Master cylinder


Information and questions on GL1200 Goldwings (1984-1987)
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predsr1
Posts: 2
Joined: Mon May 12, 2014 10:08 pm
Location: Murfreesboro, Tennessee
Motorcycle: 1984 Honda Goldwing Interstate GL 1200

Rear Master cylinder

Postby predsr1 » Mon May 12, 2014 10:14 pm



I have a 84 interstate and am trying to bled the brakes but I am getting nothing. I have read some post that say there are 2 holes in the part where the fluid runs in, I can see 1 hole and the other looks like a indentation. is this hole suppose to be open too?



Silverado06
Posts: 5
Joined: Mon May 12, 2014 9:12 pm
Location: Canada
Motorcycle: 1984 GL1200 Aspencade

Re: Rear Master cylinder

Postby Silverado06 » Wed May 14, 2014 12:05 am

Let me know how you make out with this.
The GW I picked up has been sitting for over 10 years and it seems that the rear master cylinder piston is stuck in the fully depressed position.
Plenty of clear brake fluid in the resevior but no joy on piston movement.

I may remove the line from the caliper and try to blow it back with compressed air.

The caliper is not stuck, the bike rolls free.

User avatar
flash2002
Posts: 178
Joined: Mon Aug 30, 2010 6:38 pm
Location: Montreal, Canada
Motorcycle: gold wing 1800
2003

Re: Rear Master cylinder

Postby flash2002 » Sat May 17, 2014 8:21 am

predsr1 wrote:I have a 84 interstate and am trying to bled the brakes but I am getting nothing. I have read some post that say there are 2 holes in the part where the fluid runs in, I can see 1 hole and the other looks like a indentation. is this hole suppose to be open too?

Yes, there are 2 holes, the one that looks like a indentation is very small like a hair. You can maybe use a piece of copper wire to check if it's clear. Maybe your best bet is to take the master off take it apart to clean, you might have to get a rebuild kit.

predsr1
Posts: 2
Joined: Mon May 12, 2014 10:08 pm
Location: Murfreesboro, Tennessee
Motorcycle: 1984 Honda Goldwing Interstate GL 1200

Re: Rear Master cylinder

Postby predsr1 » Sat May 17, 2014 11:58 am

I did take a drill and drill that hole out as the gentleman I bought it from let the motorcycle set for 20 years so it's rather hard. I did buy a new master cylinder rebuild kit and put it in and now I have brakes all around

Silverado06
Posts: 5
Joined: Mon May 12, 2014 9:12 pm
Location: Canada
Motorcycle: 1984 GL1200 Aspencade

Re: Rear Master cylinder

Postby Silverado06 » Thu May 22, 2014 8:35 pm

Great to hear !

Just got finished mine and it now has solid brakes.

Pulled the rear master cylinder and took it apart and it looked brand new.
Piston, cups and all flexible parts were fine with no visible signs of wear, the bore in the cylinder was clean with no scoring or varnish.
I just cleaned everything up with brake cleaner and reassembled with DOT4.
Had a heck of a time trying to bleed the system of air until I read the shop manual and found out that the right front caliper was linked.
5 minutes after reading that the bike has brakes.
I feel pretty dumb for not knowing that but quite pleased that I will be riding the bike this weekend.




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