Servo brakes and engine speed Q

Cosmicfish · Post by **Cosmicfish** » Sun Apr 05, 15 1:27 pm

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

Pete · Post by **Pete** » Sun Apr 05, 15 1:36 pm

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....

Cosmicfish · Post by **Cosmicfish** » Sun Apr 05, 15 1:47 pm

Hi Pete

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

Pete · Post by **Pete** » Sun Apr 05, 15 2:00 pm

OK, bear in mind that the pipe itself may be split and letting in air.

CAREFULLY!!!!

Cosmicfish · Post by **Cosmicfish** » Sun Apr 05, 15 2:08 pm

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

Pete · Post by **Pete** » Sun Apr 05, 15 2:27 pm

...or the diaphragm in the Servo has split or the valve at the back (bulkhead side) has failed.

Personally I hate servo brakes........

Cosmicfish · Post by **Cosmicfish** » Sun Apr 05, 15 2:32 pm

Can I just blank it off

Got to say the brakes feel better without it

Pete · Post by **Pete** » Sun Apr 05, 15 2:40 pm

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

Cosmicfish · Post by **Cosmicfish** » Sun Apr 05, 15 4:30 pm

Muscle car

Thanks fella for your help

Pete · Post by **Pete** » Sun Apr 05, 15 6:17 pm

No Probelmo

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