Author Topic: 75 cb750 rear master rebuild (Read 3087 times)

78whiteorbs · « **on:** September 26, 2018, 02:58:05 PM »

Ok so this wasnt seized at the pedal but I took it apart and dont know what to do here. Seems something needs extracted. Also trying to find a rebuild kit that isnt a hundred bux....any thoughts? If I have to graft a gsxr master in to place I could ...but would like to retain Stock if not to exspense would be cool. its not a show bike just an e eryday rider.. Thats the plan.

78whiteorbs · « **Reply #1 on:** September 26, 2018, 03:00:49 PM »

78whiteorbs · « **Reply #2 on:** September 26, 2018, 03:01:40 PM »

754 · « **Reply #3 on:** September 26, 2018, 03:03:12 PM »

Looks normal. They get ugly. I have to sell but no kit for it.

78whiteorbs · « **Reply #4 on:** September 26, 2018, 03:08:48 PM »

78whiteorbs · « **Reply #5 on:** September 26, 2018, 03:10:23 PM »

Quote from: 754 on September 26, 2018, 03:03:12 PM

Looks normal. They get ugly. I have to sell but no kit for it.

754 , you have a functional one? If so Ill take it- shoot me a pm .I need this bije on the road!

78whiteorbs · « **Reply #6 on:** September 26, 2018, 03:15:44 PM »

Also need the rest of the hanger for the front master.
I have both sides of the master but missing some stuff to mount or. Pix is all I have besides both sides of the actual caliper and piston and seal.

78whiteorbs · « **Reply #7 on:** September 26, 2018, 03:16:44 PM »

78whiteorbs · « **Reply #8 on:** September 26, 2018, 03:17:26 PM »

On the rear, the part that the piston contacts in the bore is seized.

78whiteorbs · « **Reply #9 on:** September 26, 2018, 03:18:58 PM »

This kit wont work??

ekpent · « **Reply #10 on:** September 26, 2018, 04:18:02 PM »

I was able to get the piston out on my rear master cylinder by hooking it to the front master cylinder and pumping it out. If I get time I will try and find a video I saw on how to get it apart.

johans · « **Reply #11 on:** September 26, 2018, 04:59:21 PM »

78whiteorbs, is that joe marks on ebay . He's great , NOS Honda parts , a little $$ but ....

754 · « **Reply #12 on:** September 26, 2018, 05:02:43 PM »

I got mine apart with grease gun but am sure it needs a kit.
So not ready to go. If your bore is buggered, then you would need mine.
So you need the part for front with 2 mount holes, aluminum one will work, some had steel...yeccchhh..

Jerry Rxman Griffin aka MuthaF'er · « **Reply #13 on:** September 26, 2018, 05:49:01 PM »

Try SiriusConInc.com. They also have a rear caliper rebuild kit with both pistons etc for under $100. Good quality.

78whiteorbs · « **Reply #14 on:** September 26, 2018, 06:09:46 PM »

Thanks for the leads fellas.
Yes the new old stock one looks like itd do the trick but too nice. Someone else needs that for a resto. So I am gonna cook it up in a pot buzz buzz in the ultrasonic and try and pump it out with my front master. If the bore looks good then I might sit on it . For this bike imparticular I might end up going with the gsxr option. Actually just bought one for 10 bux and I think tears ago I already did this with great results.
May have been a tad bit touching if memory serves...like I could look it up pretty easy but I believe that bike had a set of raask rearsets which looked hideously strange for an f model.

78whiteorbs · « **Reply #15 on:** September 26, 2018, 06:22:34 PM »

So 754- happen to have an f front caliper mount.
I seem to be missing some pieces...anybody know if a k setup will work? It is the single front disk f. Brake

scottly · « **Reply #16 on:** September 26, 2018, 09:31:08 PM »

Use a grease gun to pump the piston out of the MC; it always works. You may be able to clean the piston assembly and reuse it.
The upper part of the caliper mount is common to K3 through K8 750s, as well as 400, 500, and 550s. Like Frank said, some are made out of aluminum, and some were made from steel. I may have a steel one gathering dust..

ekpent · « **Reply #17 on:** September 27, 2018, 05:01:03 AM »

Think member bankerdanny aka Danny pumped out his rear master piston on an F recently with a grease gun also.

78whiteorbs · « **Reply #18 on:** September 27, 2018, 05:05:36 AM »

So I can use same mounts for the ones mentioned?
Heres what I am working with.Seems missing one piece from other pics I have seen.

Bankerdanny · « **Reply #19 on:** September 27, 2018, 07:50:12 AM »

As far as I know the front brake on the 75-76 F is the same as on the K and the 75-78 750K caliper and bracket should fit.

I did use the grease gun trick on my rear master and it worked fine. I didn't have good luck with the rebuild though. The piston in my kit didn't fit properly. I ended up replacing the rear with an inexpensive generic master with a remote reservoir which seems to be working just fine.

scottly · « **Reply #20 on:** September 27, 2018, 08:48:02 AM »

Is this the part you're missing?

78whiteorbs · « **Reply #21 on:** September 27, 2018, 09:54:49 AM »

Quote from: scottly on September 27, 2018, 08:48:02 AM

Is this the part you're missing?

Yes

78whiteorbs · « **Reply #22 on:** September 28, 2018, 02:57:22 PM »

Quote from: scottly on September 27, 2018, 08:48:02 AM

Is this the part you're missing?

Do u have that parts?

scottly · « **Reply #23 on:** September 28, 2018, 08:19:08 PM »

Yes, I have a steel version of that part; PM me a mailing address, so I can get a quote on what it would cost for shipping.

scottly · « **Reply #24 on:** September 28, 2018, 08:24:14 PM »

PS Before buying a new MC, or a rebuild kit, take your existing MC apart, cleaning it and reassembling it using the original parts. A lot of the time, a good cleaning is all that is needed.

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Author Topic: 75 cb750 rear master rebuild (Read 3087 times)