[Healeys] 100 brakes

[warthodson at aol.com]

The bubble will perhaps migrate to the highest point & if that is the reservoir then it might escape, but this only applies if the path is always up. Then bubble will never migrate on its own down. Also, the system is not pushing on the bubble in any single direction. If the system is under pressure, the is uniform throughout the entire system. Essentially, the bubble, being lighter than the fluid, trying to float. Bleeding the system is different, there is flow of the fluid to help move the bubble.Gary

-----Original Message-----
From: Hank Leach <gradea1 at charter.net>
To: 'greylinn at ozemail.com.au' <greylinn at ozemail.com.au>
Cc: 'Michael Salter' <michaelsalter at gmail.com>; 'warthodson at aol.com' <warthodson at aol.com>; 'healeys at autox.team.net' <healeys at autox.team.net>
Sent: Mon, Mar 13, 2023 7:15 pm
Subject: Re: [Healeys] 100 brakes

Peter-yea, what I think happens there, providing there are no leaks anywhere else, is that under pressure, overnight, the system "pushes" the air bubble to the only place that it can get out-the vent hole in the canister!
I have used this method also for "final bleeding"...could be a line item on an invoice to look official and garner more dough, Ha.  Hank

-----------------------------------------From: "greylinn--- via Healeys" 
To: "Michael Salter"
Cc: healeys at autox.team.net
Sent: Monday March 13 2023 4:02:50PM
Subject: Re: [Healeys] 100 brakes

Michael assuming you have someresistance after pumping the pedal, jam the pedal down hard andleave it at least overnight, preferably longer. Do this repeatedly& you will find the pedal comes up. Don’t ask me why, but I’ve donethis several times with my own and other people’s cars, and itworks!

Cheers Peter From:Healeys <healeys-bounces at autox.team.net>On Behalf Of Michael Salter via Healeys
Sent: Tuesday, 14 March 2023 5:43 AM
To: warthodson at aol.com
Cc: healeys at autox.team.net
Subject: Re: [Healeys] 100 brakes This article may help.https://precisionsportscar.com/bleeding-austin-healey-4-wheel-drum-brakes/ On Tue., Mar. 14, 2023, 7:54 a.m.warthodson--- via Healeys, <healeys at autox.team.net>wrote:
We arehaving a very difficult time adjusting & bleeding the brakes on afriend's BN1.The carhas recently under a full ground up restoration so things likebrake lines including flex lines are new, seals in the brakecylinders are new, the master cyl. is new, etc.We bleedthe system so many times different way that I have losttrack. We haveadjusted the free play to assure that the plunger is able to returnto the full "off" position.When weadjust the operating rod to achieve the specified 1/8" freemovement at the pedal.We haveadjusted the brake shoes to have a very slight drag atrest.Ourissue is:Excessivebrake pedal travel before the brakes begin to beeffective. Pumpingthe brakes temporarily improve the pedal travel issue, which wethink indicates air still in the system.We arenot having any leaks & the reservoir port is functioning correctly,IE: no locking up of the brakes. Gary     

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