Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: Moorey on March 19, 2017, 07:51:15 PM

Title: 750f REAR MASTER CYLINDER
Post by: Moorey on March 19, 2017, 07:51:15 PM

Help needed, I can't find a rear master cylinder seal kit for a USA 1976 CB750f I assume all F1s the same. DSS and CMS no stock. Its just starting to show wet. If it gets to the dripping stage will brake fluid do any damage to the silencer. I know it does paintwork no favours.
Cheers Chris

Title: Re: 750f REAR MASTER CYLINDER
Post by: Green1 on March 19, 2017, 07:53:26 PM

Brake fluid will strip chrome. and paint with ease.

Title: Re: 750f REAR MASTER CYLINDER
Post by: Moorey on March 19, 2017, 09:15:48 PM

Does anyone know if the actual seals in the front master cylinder are the same as the rear master cylinder.

Title: Re: 750f REAR MASTER CYLINDER
Post by: haynes66 on March 20, 2017, 07:40:23 AM

they are on the F2 but i dont know if the F1 has the same calipers

Title: Re: 750f REAR MASTER CYLINDER
Post by: Bryanj on March 20, 2017, 07:59:35 AM

Use Motogrid to get the correct part number then put that into thier parts search and it will tell you all the bikes that it fits, also find a local dealer with a Hi Level account as they have pages n pages of brake seal kits

Title: Re: 750f REAR MASTER CYLINDER
Post by: Spitfire on March 20, 2017, 10:57:10 AM

Found this
http://www.cb750.com/threads/2096-Found-alternative-CB750F-rear-master-cylinder-rebuild-kit

Cheers

Dennis

Title: Re: 750f REAR MASTER CYLINDER
Post by: Moorey on March 20, 2017, 11:11:15 AM

Not available with Motogrid but thanks anyway. I have read that early GL 1000 seal kits fit  with little modification to the pushrod. I've ordered one so we will see.

Title: Re: 750f REAR MASTER CYLINDER
Post by: Moorey on March 20, 2017, 11:14:17 AM

Thanks Spitfire I read the same thing last night and ordered one.  :)

Title: Re: 750f REAR MASTER CYLINDER
Post by: Moorey on March 20, 2017, 05:20:02 PM

I have just pulled the rear master cylinder in bits and the original front master cylinder and doing some measuring. The 2 piston seals in both front and rear master cylinders are the same. Could be a bit of useful info for someone.  Both cylinder bores are 14mm and pistons 13.8mm

Title: Re: 750f REAR MASTER CYLINDER
Post by: Spitfire on March 20, 2017, 05:28:32 PM

That's handy info, I'm sure that somewhere on here there is a section that lists interchangeability, might be useful there.

Cheers

Dennis

Title: Re: 750f REAR MASTER CYLINDER
Post by: Moorey on March 22, 2017, 06:56:05 PM

The GL1000 rear master seal kit 43510-371-305 came this morning. The only thing I have had to do is cut 6mm off the threaded pushrod. It works fine. :)

Title: Re: 750f REAR MASTER CYLINDER
Post by: Spitfire on March 22, 2017, 07:00:50 PM

That's good news for us F1 owners, thanks for posting.

Cheers

Dennis