Author Topic: Front brake master cylinder  (Read 787 times)

Offline Chris whit

  • SOHC Associate
  • Posts: 56
    • View Profile
Front brake master cylinder
« on: January 20, 2019, 02:00:33 PM »
Hi Guys , need to replace seals in leaking front brake master cylinder . Going to order a repair kit from DS , should i order genuine or aftermarket. Is it a straightforward job to replace seals etc.
Thanks

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: Front brake master cylinder
« Reply #1 on: January 20, 2019, 02:39:24 PM »
Either are fine Chris.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Athame57

  • SOHC Master
  • Posts: 1124
    • View Profile
    • SeaWitch Artist
Re: Front brake master cylinder
« Reply #2 on: January 20, 2019, 02:51:04 PM »
What I have on my handlebar is the aftermarket one from DS, it is fine, the whole unit goes straight on and it is cheaper than replacing the just the piston kit for the original that you have to tinker about fitting.
I brake for animals!
1978 CB400F2

Offline Bryanj

  • Grogu
  • *
  • Posts: 10694
    • View Profile
Re: Front brake master cylinder
« Reply #3 on: January 20, 2019, 05:43:21 PM »
Seal kits are OK but stripping the master without correct circlip pliers is just about impossible

Offline thegreatpan

  • SOHC Associate
  • Posts: 92
    • View Profile
Re: Front brake master cylinder
« Reply #4 on: January 20, 2019, 06:21:51 PM »
+1 for what Bryanj  said, I have never worked on anything more frustrating than that little circlip!

Offline paul G

  • SOHC Master
  • Posts: 1748
  • No room left in the garage what now !
    • View Profile
Re: Front brake master cylinder
« Reply #5 on: January 20, 2019, 07:27:04 PM »
+1 for what Bryanj  said, I have never worked on anything more frustrating than that little circlip!
+ another on that as I am just finding out >:( >:( just sent for another set of Circlip pliers with long thin blades. If they still don't fit I will be taking the grinding wheel to them ;) ;)
Brian,
            Is there any spec on the correct ones for the job.
Honda CB400 4
Honda CB550 K3 (sold)
Honda CB750 UK K1
Kawasaki Z650 C2
Kawasaki Z650 cafe racer (Sold)
Honda CD175 sloper

Offline mattsz

  • SOHC Pro
  • Posts: 606
    • View Profile
Re: Front brake master cylinder
« Reply #6 on: January 20, 2019, 07:37:54 PM »
What I have on my handlebar is the aftermarket one from DS, it is fine, the whole unit goes straight on and it is cheaper than replacing the just the piston kit for the original that you have to tinker about fitting.

Athame, are you referring to the whole pattern handlebar part, reservoir and all?

Seal kits are OK but stripping the master without correct circlip pliers is just about impossible

I removed that circlip without pliers - just a pick tool hooked into one of the holes. However: I doubt I would have been able to do it if the clip hadn't been properly stuck in place by corrosion.  Instead of just spinning in its slot, it curled its way out - bent beyond use, but reuse was never part of the plan!

Offline kevski

  • SOHC Pro
  • Posts: 508
    • View Profile
Re: Front brake master cylinder
« Reply #7 on: January 20, 2019, 08:02:51 PM »
If the cylinder has never been apart before the chances are the inside is corroded, so best option is to replace the whole set up, if you want to keep it original you can get the cylinders relined at past past in Norfolk, they do a top job.

Offline Bryanj

  • Grogu
  • *
  • Posts: 10694
    • View Profile
Re: Front brake master cylinder
« Reply #8 on: January 20, 2019, 09:15:59 PM »
Even the genuine Honda tool was a swine to use but did actualy work. I think there is a pic in the workshop manual.

Offline Trigger

  • Grogu
  • *
  • Posts: 8434
  • Engines built on reputation, not advertising.
    • View Profile

Offline Chris whit

  • SOHC Associate
  • Posts: 56
    • View Profile
Re: Front brake master cylinder
« Reply #10 on: January 20, 2019, 09:48:24 PM »
Thanks guys for your comments

Offline mattsz

  • SOHC Pro
  • Posts: 606
    • View Profile
Re: Front brake master cylinder
« Reply #11 on: January 20, 2019, 09:51:44 PM »
A engineering spring divider works a treat  ;)

Like these >>> https://www.ebay.co.uk/itm/FAITHFULL-SPRING-DIVIDER-Various-Size-Dividers/351442168611?epid=22012050740&hash=item51d395eb23:m:mzYvPfI0beyBs9WpJDtlisQ:rk:2:pf:1&frcectupt=true

I did so much internet research before this job, but I never saw anyone suggest this... brilliant!

Offline Trigger

  • Grogu
  • *
  • Posts: 8434
  • Engines built on reputation, not advertising.
    • View Profile
Re: Front brake master cylinder
« Reply #12 on: January 20, 2019, 10:13:23 PM »
A engineering spring divider works a treat  ;)

Like these >>> https://www.ebay.co.uk/itm/FAITHFULL-SPRING-DIVIDER-Various-Size-Dividers/351442168611?epid=22012050740&hash=item51d395eb23:m:mzYvPfI0beyBs9WpJDtlisQ:rk:2:pf:1&frcectupt=true

I did so much internet research before this job, but I never saw anyone suggest this... brilliant!


It works as long as it is a spring divider with the points that come together. Find a good old set and harden the tips. And always remember to remove the ring clip that holds the rubber dust cover first  ;)

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal