« previous next »
Pages: [1]   Go Down

Author Topic: 1972 CB500/4 Master Cylinder holes  (Read 550 times)

0 Members and 1 Guest are viewing this topic.

Offline CeeDeeNZ

  • Full Member
  • *
  • Posts: 3
1972 CB500/4 Master Cylinder holes
« on: August 25, 2024, 10:12:32 PM »
Greetings from the bottom of the world !

I'm currently working on refurbishing the front brakes, and in the bottom of the Brake Fluid
reservoir there are two holes. One of them (closest to the operating lever) is completely clear and goes
straight through into the plunger cavity below, but the other hole doesn't seem to go any where. It's like it's
blanked off, or full of something hard. Should it be going anywhere ?  Should it be clear straight through
to the pluger cavity also ?

Thanks in advance
Chris

 
Logged

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,381
  • Humboldt, AZ
Re: 1972 CB500/4 Master Cylinder holes
« Reply #1 on: August 25, 2024, 10:27:42 PM »
Hi Chris. There is a teeny tiny hole down in the bottom of that hole. It's purpose is to release pressure in the brake line when the brake isn't applied. It's open at rest, and closed by the rubber cup when the brake is applied. When blocked, the brake will stay on even after the handle has been released.
Logged
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline bryanj

  • Really Old Timer ...
  • *******
  • Posts: 14,103
  • CB500 Number 1000036
Re: 1972 CB500/4 Master Cylinder holes
« Reply #2 on: August 26, 2024, 04:49:24 AM »
It is tiny, 1 or 2 strands of electrical multicore size
Logged
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline CeeDeeNZ

  • Full Member
  • *
  • Posts: 3
Re: 1972 CB500/4 Master Cylinder holes
« Reply #3 on: August 26, 2024, 07:03:51 PM »
Thanx for the replies, time to put my glasses on and have a closer look !
Logged

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,005
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: 1972 CB500/4 Master Cylinder holes
« Reply #4 on: August 26, 2024, 07:30:57 PM »
Don't look closely at it when moving the brake lever: it can squirt 1" above the brake housing when the lever is applied & released!
;)
Logged
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline jaytee-nz

  • Hot Shot
  • ***
  • Posts: 647
Re: 1972 CB500/4 Master Cylinder holes
« Reply #5 on: August 27, 2024, 12:40:11 AM »
Chris - I'm in New Plymouth so if you need a replacement M/C I've got a few. Can't guarantee their condition so there would be no cost.
Cheers - John
Logged

Offline CeeDeeNZ

  • Full Member
  • *
  • Posts: 3
Re: 1972 CB500/4 Master Cylinder holes
« Reply #6 on: August 27, 2024, 01:21:23 AM »
I'm also in New Plymouth !  Small world :-)  I'll flick u a pm with my  cell#
Logged
Pages: [1]   Go Up
« previous next »