Help brake switch vacuum pull to much

[Jamous]

Hello all

So bought a brand new brake switch to fix into the mount point on the brake servo which sits as it should pressed in lovely and works fine .

 

Start the 2002 up and the brake pedal moves forward there fore putting the brake light on due to the vacuum ??? I can't lengthen it any more what else can I do ?

 

I have the one way valve on the vacuum pipe towards the engine and when switched off pedal returns back how it should .

Is there an adjustment in the pedal some how . 

I'm stuck 

Thanks J

 

 

[dlacey]

Servo fault? Pedal shouldn't move up?

[halboyles]

Is the brake light switch adjusted to the proper distance as in the Workshop Manual?  Do you have the correct switch?

[Mike Self]

Was the pedal working normally before you installed the new switch?

 

Remember that the brake light switch is a normally on switch--i.e. it completes the electrical circuit (and thus lights the brake lights) when the plunger is fully extended.  So you have to adjust the switch so that its plunger is pushed partway in when your foot is off the brake pedal.  Otherwise your brake lights will be on all the time and will quickly melt those expensive tail light lenses (ask me how I know that!).  

 

If the pedal is sticking, lubricate all the pivot points, both in the engine compartment and at the pedal itself.  And if you have a 75 or 76 with the windshield washer bottle mounted above the brake pedal linkage--a leaking bottle or hose will rust the pivot points and cause a stiff or non-returning pedal.

 

mike

[TobyB]

Quote

Start the 2002 up and the brake pedal moves forward 

 

Suggests a booster failure to me- the booster should NEVER be able to actuate the brakes on its own.

 

Stuck actuating valve in the booster itself, methinks.

 

t

 

[Jamous]

1 hour ago, TobyB said:

 

Suggests a booster failure to me- the booster should NEVER be able to actuate the brakes on its own.

 

Stuck actuating valve in the booster itself, methinks.

 

Yeah ok I think that to now.

As said before I cant make any more adjustment on the switch. 

With ignition on brake works as should with lights off then on when brake pedal pressed . 

Start the car and that brake pedal will suck forward slightly by about 3/4 mm enough to. Put brake lights on picture added while running 

Which in turn the switch is fully out I will take a picture tomorrow to show you all . 

More expenses ... Till I sell it 

So I will need a servo and not the whole master cylinder I hope ?

Add pics tomorrow can't upload 

 

1 hour ago, TobyB said:

 

 

[Jamous]

On 12/6/2018 at 5:59 PM, TobyB said:

 

Suggests a booster failure to me- the booster should NEVER be able to actuate the brakes on its own.

 

Stuck actuating valve in the booster itself, methinks.

 

Yeah ok I think that to now.

As said before I cant make any more adjustment on the switch. 

With ignition on brake works as should with lights off then on when brake pedal pressed . 

Start the car and that brake pedal will suck forward slightly by about 3/4 mm enough to. Put brake lights on picture added while running 

Which in turn the switch is fully out I will take a picture tomorrow to show you all . 

More expenses ... Till I sell it 

So I will need a servo and not the whole master cylinder I hope ?

Add pics tomorrow can't upload 

 

Quote

 

 

[Jamous]

Engine off below and above engine running 

[Jamous]

Quick video of engine starting then switch off 

[Hans]

So it worked fine before you changed the switch? And that's all you did before it hot wonky?

 

You mean 3/4 of an inch I assume.

[Preyupy]

That is a Servo problem, even if the switch was holding the linkage partly depressed it should NOT do that.  If it started doing this when you replaced the switch it did not start doing this BECAUSE you replaced the switch. 

[Hans]

Odd coincidence.

[Jamous]

I know the switch isn't the problem ! I was just asking if this is normal as it was a project car with many parts missing . 

And it had the wrong brake switch in place before I purchased this from Rotterdam.

 

Need a servo now , and one other thing are all the servos interchangeable as in LHD and RHD being the same . 

 

Thanks Jaime 

Plymouth 

[Henning]

12 hours ago, Jamous said:

Seems to me that there's a nut missing. Installed this way, your switch is not adjustable- what it should be.

 

This is how it should look like:

Not mine.

h

 

[Simeon]

1 hour ago, Jamous said:

Need a servo now , and one other thing are all the servos interchangeable as in LHD and RHD being the same . 

 

LHD and RHD arrangement are completely different. RHD uses two remote servos whereas LHD has a more conventional arrangement with the master cylinder bolted to the front face of the servo.