[Mgs] Brake pressure balance switch

Simon Matthews simon.d.matthews at gmail.com
Fri Jun 8 20:24:31 MDT 2018


Update:
I haven't had a chance to look at the car yet, but now the light has
gone off again.

Thanks for all the suggestions: I will be taking a look at the brakes.

Simon

On Fri, Jun 8, 2018 at 10:07 AM, David Ambrose via Mgs
<mgs at autox.team.net> wrote:
>
> My '69 is like this too. Easiest thing to do is to unscrew the switch, and
> look in the hole. If fluid comes out, you need to rebuild that unit. If
> there is a groove right in the middle of the hole, All is good with the
> hydraulics. You might be able to get a small screw driver in there and
> recenter the piston. I believe it can get pushed off to one side when you
> bleed the breaks.
>
> Rebuilding that imbalance detector is easy, once you get it out of the car.
>
> Cheers,
> Dave Ambrose
>
>
> On 6/8/2018 5:30 AM, Hans Duinhoven via Mgs wrote:
>>
>> The switch (in my 71 BGT) is actuated by a kind of piston in the hydraulic
>> circuit.
>> The piston is housed into a front - back cross brake line connection,
>> where the piston will not be moved from its center position, when the
>> pressure at both sides is equal.
>> The piston has at both sides o-rings, which have the function for building
>> the pressure, like the piston rings in an engine.
>> If one of these rings is faulty (leaking), the actuator will be moved and
>> will actuate the brake pressure switch.
>> In my 71 BGT these o-rings can be replaced easily.
>>
>> Cheers,
>> Hans
>> 71 BGT NRG WW
>>
>> -----Oorspronkelijk bericht-----
>> Van: Mgs [mailto:mgs-bounces at autox.team.net] Namens Charley Robinson via
>> Mgs
>> Verzonden: vrijdag 8 juni 2018 1:41
>> Aan: PaulHunt73; MGS
>> Onderwerp: Re: [Mgs] Brake pressure balance switch
>>
>> Not so;  if the rear brakes aren't working then the brake balance
>> sensor/switch is doing its job.  If I found out that both front & rear
>> brakes were working normally then I'd start looking for the reason for
>> the false indication.
>>
>> CR
>> On 6/7/2018 2:04 AM, PaulHunt73 via Mgs wrote:
>>>
>>> Of course.  But that's a different issue to why the balance light is on.
>>>
>>> PaulH.
>>>
>>> ----- Original Message -----
>>>>
>>>> Not necessarily. She's driving the thing. I'd want to know if the
>>>> rear brakes are working. Obviously the front brakes are working or it
>>>> wouldn't stop. As to turning the wheels, I know how to multiply
>>>> force. ;-)
>>>>
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>>
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>
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