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Servo brakes and engine speed Q

Posted: Sun Apr 05, 15 1:27 pm
by Cosmicfish
Hi Fellas
I'm having a bit of a problem and not sure the answer I'm hoping for some Ideas.

MY 66 T&C has drum brakes with a servo, now they are ok ish but dont fill me with confidence they are not brill but they seem to pull the wagon up ok. but of recent I have noticed that when I brake the engine speed drops.I would expect it to drop a bit due to the servo.
The thing is if I hold the brakes on the engine speed drops and then stalls.

So i'm starting to wonder if I might have a leak on the servo it would explaine why it's stalling ( Air getting in weekening the fuel mix) and it would explain the non fab brakes, But how do I go about checking a servo for leaks without taking it apart or is taking it apart the only way to check?

Any one got a any idea's

Posted: Sun Apr 05, 15 1:36 pm
by Pete
CAREFULLY disconnect the pipe to the Servo and Plug it both directions and then VERY CAREFULLY take it for a drive and see if the situation prevails (other than heavier and probably less efficient / more effort Brakes....

Posted: Sun Apr 05, 15 1:47 pm
by Cosmicfish
Hi Pete

Great mind think alike, was just thinking of the same thing

Posted: Sun Apr 05, 15 2:00 pm
by Pete
OK, bear in mind that the pipe itself may be split and letting in air.

CAREFULLY!!!!

;) ;)

Posted: Sun Apr 05, 15 2:08 pm
by Cosmicfish
Ok have just popped out for a spin with both ends of the pipe blocked off .

And it don't stall any more :)

And the brakes feel better , ok I have to push a bit harder but not a lot harder than before.

So I think I have a leak some were

Posted: Sun Apr 05, 15 2:27 pm
by Pete
...or the diaphragm in the Servo has split or the valve at the back (bulkhead side) has failed.

Personally I hate servo brakes........ ;)

Posted: Sun Apr 05, 15 2:32 pm
by Cosmicfish
Can I just blank it off

Got to say the brakes feel better without it

Posted: Sun Apr 05, 15 2:40 pm
by Pete
Cosmicfish wrote:Can I just blank it off
Yup.

Cosmicfish wrote:
Got to say the brakes feel better without it
..of course it does - muscle car 8-)

;)

:thumbright:

Posted: Sun Apr 05, 15 4:30 pm
by Cosmicfish
:lol: Muscle car

Thanks fella for your help :thumbright:

Posted: Sun Apr 05, 15 6:17 pm
by Pete
No Probelmo ;)

You probably need to look at a long term fix, though....