[Healeys] troubleshooting rebuilt Girling BJ8 brake servo

[David Porter]

Call Tim or Martin at Power Brake in CA 408-292-01305 helpful folks..
Dave
GT6+

On 10/21/2015 2:39 PM, Michael Salter wrote:
> Hi Bob,
> In my experience the Girling servo units can be very difficult to 
> rebuild satisfactorily.
> The symptoms that you describe are however more indicative of air in 
> the system than those typical of servo difficulties.
> If the servo is not working properly the typical symptoms are no servo 
> action at all or brakes dragging and/or locking on.
> To check the servo action pump the brake pedal several times with the 
> engine not running then,  with pressure on the brake pedal, start the 
> engine and the pedal should drop a little as manifold vacuum is 
> established. If the pedal drops the servo is working.
> The other problem is evident when you drive the car.. First the brake 
> pedal will become quite "hard" and there will be no "free play" at the 
> top of its stroke next the brakes will get very hot and eventually the 
> car will stop moving because the brakes are locked on..
> The usual cause of that problem is the failure of the large piston 
> within the servo unit to return fully to its rest position when the 
> brakes are released. That is where the "thinner sponge" thing comes 
> in. The correct solution is to have the inside of the servo "chest" 
> re-coated with a special slippery coating. There should be more 
> information on that way back in the archives.
> Hope that helps,
>
> Michael S
> BN1 #174
> (4 wheel drum brakes ..no servo)
>
>
>
> On Tue, Oct 20, 2015 at 6:24 PM, R. Cobb <rcobb at earthlink.net 
> <mailto:rcobb at earthlink.net>> wrote:
>
>     Unit was rebuilt using kit from Moss.
>
>     Symptoms, following bleeding hydraulic brake system (no
>     differences noted whether car running or not): On first try of
>     brakes, nearly no braking, with pedal going almost to floor.
>
>     Second try, sometimes a release is felt in the pedal (with an
>     associated, slight "pop" sound) with a bit more braking and less
>     travel of pedal.  By the third try, the pedal travel seems more
>     normal, and the braking is improved, though not up to the level
>     expected.
>
>     The above pattern has been replicated numerous times, with the
>     thinking that perhaps if something were binding, it would work-in.
>     No such luck.
>
>     Any thoughts?
>
>     I recall that some months ago a contributor mentioned having had
>     to install a thinner sponge rubber ring for under the piston
>     seal...because of binding(?).  Could this be the issue?  Would
>     this result in the behavior I'm experiencing?
>
>     Thanks in advance.
>
>     Bob
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> -- 
> /If you can't fix it with a hammer, you've got an electrical problem./
>
>
>
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-- 
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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