Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: Skoti on April 07, 2010, 07:45:59 AM

Title: F1 Rear brake master cylinder seal kit
Post by: Skoti on April 07, 2010, 07:45:59 AM

Anyone know where to purchase an after market F1 rear brake master cylinder repair kit?  :)

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Bryanj on April 07, 2010, 08:15:17 AM

I dont think there is one you have to go Honda

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Yoshi823 on April 07, 2010, 09:33:10 AM

Not sure how much they are from Honda but Dave Silvers do the kit...
http://www.davidsilverspares.co.uk/parts/part_6985/

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Skoti on April 07, 2010, 10:16:43 AM

Thanks for that, I already bought the correct genuine Honda rear master cylinder kit for an F1, but it differs from the original factory fitment and will not seal correctly.

The seal that fits onto the piston is narrower than the original seal. When assembled it sits slightly further back on the exposed corroded part of the master cylinder bore.

Click on the globe icon below my details and take a look at the high resolution photos on my web site to see exactly what I mean.  :(


http://picasaweb.google.co.uk/ktis66/HondaCB750F1SuperSport1976?feat=directlink

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Spitfire on April 09, 2010, 09:32:49 AM

Very strange 43510-392-305 was the parts (from DSS) that I used on my CB750F1 and they fitted great and they work well, but I never compared the new parts to the old on mine I just used the new parts.
(http://i192.photobucket.com/albums/z244/DennisMcc/Progress%20shots/brakepartsrearSmall.jpg)
Cheers

Den

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Skoti on April 10, 2010, 07:23:41 AM

Hi Spitfire,

maybe your rear brake master cylinder is in better condition than mine.
 
I noticed that the front brake master cylinder is the same bore as the rear and the after market repair kit I fitted to the front uses a seal identical to the original Honda seal on the rear.
So it may be possible to buy another aftermarket front kit and swap the seal on the rear master cylinder with the seal supplied in the front after market kit  :-\

I noticed on an earlier post you renewed your front caliper piston, I could do with renewing mine as well, because at the moment I can only use half worn brake pads keeping the outer corroded part of the piston away from the seal.

If you still have your old caliper piston please could you measure it for me?
I found a supplier that lists replacement pistons by size.

 http://motorcycleproducts.co.uk/catalogue/brake-caliper-piston-kits-c-108_233.html?page=2&sort=2a

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Spitfire on April 10, 2010, 08:34:28 AM

Here's the post on replacement brake pistons, in the end I bought a stainless steel piston from the US eBay site.
http://forums.sohc4.net/index.php?topic=23037.msg244536#msg244536

Cheers

Den

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Skoti on April 10, 2010, 09:13:04 AM

Good Info

many thanks  :)

Title: Re: F1 Rear brake master cylinder seal kit
Post by: andy_c101 on April 10, 2010, 08:35:00 PM

I see there's a rear brake assembly on ebay right now:-
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=350338874209&ssPageName=ADME:B:SS:GB:1123

Dont know if that's any use to you.

Andy C

Title: Re: F1 Rear brake master cylinder seal kit
Post by: Skoti on April 11, 2010, 09:47:08 AM

Andy,

that ebay item is for a later 1978 model. Thanks anyway  :)