Topic: 1977 CB750A master cylinder rebuild kit?

[Ved]

I have been searching for a while now and all I seem to find are rebuild kits for the 76 model. Why no 77 models? Are they that much different?

I cleaned a ton of junk out of the front caliper and got it looking like new. After bleeding, the front brake works great, but I have a slow drip that runs down the brake handle after it is squeezed a few times. Apart from just slapping on an aftermarket universal master cylinder, I would like to try to rebuild it. Anyone know where to get a rebuild kit for the 77 model?

[raymond10078]

Bike bandit shows that the master cylinder is common with the following bikes:

1977 Honda CB550F
1977 Honda CB550K
1977 Honda CB750A
1977 Honda CB750K
1978 Honda CB400A
1978 Honda CB400TII
1978 Honda CB550K
1978 Honda CB750A
1978 Honda CB750K
1978 Honda CX500

Maybe this will help.

I just bought and installed one earlier this year (for my 78) - I can check on the source when I get home.
 

[Ved]

Too bad Bike Bandit only offer the CB400 & GL1000 Gold Wing


Further searching the net with the common models you listed still yielded no results. I keep finding either earlier or later years available. Nothing for 1977/78...  

*edit* Like wow...site after site, nothing... I'm serious, check it out. Site, after site, after site, nothing compatible with that year. It's nuts. (twilight zone music)

I got excited for a second when I found one that said "1977 - 1978 Honda CB750 Ft. Master Cylinder Rebuild Kit" But alas it was for the 1977 - 1978 CB750F Super Sport & 1978 GL1000K Goldwing. 

[raymond10078]

I bought mine on ebay.

Still available.  See this listing:  350355611738.

Pricey though . . . .

[Ved]

Holy crap... I appreciate ya looking, but for that price I might as well get an aftermarket Master Cylinder. I might be willing to spend like 20-25 bux on a rebuild kit, but $50 for a few bits of rubber is ridiculous. The average price for the other year/makes averaged from 12-28 dollars. If I was trying to make a showroom bike it would be worth it.

[bryanj]

The big difference is that the brake light switch is on the underside of the master instead of being a hydraulic switch in the line.

In the repair kit the only difference i can see is that the 77 does not use the none return valve that goes in first, check the bore diameter, if its 14mm i bet you can use the earlier kit, especialy if your piston is OK and just new rubbers are needed.

N.B. I cannot guarantee this as the 750A did not come to UK and consequently i never worked on one

[raymond10078]

I know what you mean about the $$$.

I spent the money - and then accidentally found a master cylinder supplier (it either was OEM or looked exactly the same) - for about the same amount of money.  It was a uk (Britian) site - don't recall which one - and didn't find it after a short look.

I recall that the bore dimension is cast into the body of the master cylinder. 

[ToddR]

I remember a video that somone in the forum forwarded to me for the rebuiding of a master cylinder(front) for my K7(1977 CB 750K butcan't find it! anyone out there recall this video? Appeciate the help as always and ride safe!! Thanks again!

[chickenman_26]

Part # = 45530-404-315
Part Description = MASTER CYLINDER SET - (replaces 45530-404-305)
Model Count = 10
CB400A 1978 400 CB400A Hondamatic Street
CB400TII 1978 400 Hawk II 400 Street
CB550F-K4 1977 550 550 Super Sport Street
CB550-K3 1977 550 550 Four Street
CB550-K4 1978 550 550 Four Street
CB750A-77 1977 750 CB750A Hondamatic Street
CB750A-78 1978 750 CB750A Hondamatic Street
CB750-K7 1977 750 750 Four Street
CB750-K8 1978 750 750 Four Street
CX500 1978 500 CX500 Street

[salukispeed]

Found the same part number number from the local dealer on the1977 750-A microfiche and ordered one yesterday for $38 so I can say they are available for the moment. Now if I could only find the rear grab rail and turn signals for reasonable???

[hazardus320]

I know this is an old thread, but as I was searching for myself and I thought I would update it just in case someone else needs to find one as well.

I found the rebuild kit for a hair over $33 + shipping:
http://www.partzilla.com/parts/detail/honda/HP-45530-404-315.html?gclid=Cj0KEQjwpvufBRCwzp_zyqfkhrcBEiQA8b-SHBZf7Nw2vYlrcKa6kl0nQFiOiaJhAIIuBsyZQqF9MrcaAqeE8P8HAQ