Yup! Absolutely!

Fairly easy to change out.

Regards,

John Rodgers
88 GL Driver

Mike Collum wrote:
> You've described a classic symptom of a master cylinder that has leaky
> internal seals, John.
>
> Mike
>
>
>
> John Goubeaux wrote:
>> Folks,
>>
>> Would the Brake Master Cylinder be responsible for the following
>> symptoms:  Pedal is hard and there is no pumping needed to stop but if
>> pedal remains depressed,  eg such as waiting at a stop light, and
>> allowed to move up and down slightly, it will slowly sink to the floor
>> over the course of several slight up and down pumps. I have re-done the
>> back brakes: drums,  shoes, cylinders,  and they are adjusted and bled.
>> I also see no fluid leaks fore or aft.
>>
>> Someone earlier suggested, as a check on the brake booster, to press the
>> pedal and hold and start the engine and confirm that the pedal sinks a
>> bit as a confirmation that the booster is working properly. I have done
>> this and it behaves accordingly.
>>
>> It seems pretty evident that the MC is starting to pass pressure, but
>> thought I would confirm before I replace another part.
>>
>> -john
>>
>
>