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General Juppy's brake servo change. The result

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General Juppy's brake servo change. The result

Stuartl

Stuartl

Maranellohouse.com
Parked in the garage
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Changed the servo last Fri but only took the car to work this morning so first test.
Result is the pedal still travels quite a bit but I have to exert a lot less pressure on the pedal to get the brakes to operate, giving me a much more reasuring feeling.

One other thing I've noticed. When the car was idling before the change, and I put my foot on the brake, the idle went down as if the car was going onto 3 cylinders, sort of chugging style. After the change this has gone completely and I actually think the engine is running more smoothly and seems more responsive. Clearly the servo has been on it's way out and air from the manifold was escaping out of the servo. So good result all round. (y)

One drawback is I noticed on the way through town this morning that my brake lights are stuck on. Must have upset the brake switch somehow even though it's at the other end of the pedal box. :bang:

Thanks to Chris for supplying the servo.
 
Last edited:
Stuartl said:
One drawback is I noticed on the way through town this morning that my brake lights are stuck on. Must have upset the brake switch somehow even though it's at the other end of the pedal box. :bang:
Click to expand...

That's a good job that you noticed that... We had that happen on one of our cars but didn't notice, and it had a flat battery when we got back to it. :eek:
 
OMG, I've just realised something which I hope you can help with/diagnose.

The two Selecta's we have both have servo assisted brakes. The new Selecta only has brake pedal travel of about 1/3 (in total when standing on the pedal) of my (or origional Selecta, sorry get's all confusing with all the Panda's we've got).

I done the test to check if there is any servo assistance on the new Selecta. Pumped the brake with engine off until solid, and then started engine with my foot on the pedal and it moved very slightly compaired to my Selecta.

Is there a fault with any of them? Should it travel as far as mine, or should mine not travel that far etc? The brakes on both car's are effective, they stop the car, but I get the feeling there isn't really and 'assistance' on the new selecta.

What could be the cause, and remedy? Also roughly how to survo's work in as far as vacumme. I mean to they have pipes going from a compressor (don't think they do) because I know they don't run off of and belts :eek:

Sorry to take over a thread, but I thought as it's linked it saves me making another and clutering up the place (y)

Jon.
 
The vacuum[not strictly anywhere near a vacuum , drop in pressure more like] is created in the servo from the suction at the manifold , the same suction that draws fuel / air mixture into the cylinders for combustion . there is a diaphragm in the servo , one side of which is the low pressure . when the brake is pressed the diaphragm moves by magic and exerts an increased force on the master cylinder .
The brakes on your new selecta are the best brakes I have had on a Panda , I would suggest that the increase in travel of the brake pedal on the old selecta is wear ?

Going back to Stuarts servo , the change in engine note is common when applying servo brakes on a small engine , change in manifold pressure . Obviously yours was worse as your leaking servo would have caused the engine to run lean as air is sucked into the manifold ,[ also common to have same when leak in servo pipe or connects]. If the master cylinder is leaking into the servo can get a nice smelly , white cloud out the exhaust every time the brakes applied , until the brake fluid runs out :eek:
 
Many thanks for comfirming Carl.

As I said, I couldn't work out if it were a problem with mine or dad's. Then again, can they be different from one car to another? Like clutch travel (through wear normally) in two identicle cars can be different.

You mention wear or my Selecta, what is it that would have worn? The survo:confused:

I know it's (mine Selecta) got new Pad's and that didn't make a difference on travel. Don't know if it would normally affect it much?

(y)
 
Last edited:
Most Easterly Panda's said:
Many thanks for comfirming Carl.

As I said, I couldn't work out if it were a problem with mine or dad's. Then again, can they be different from one car to another? Like clutch travel (through wear normally) in two identicle cars can be different.

You mention wear or my Selecta, what is it that would have worn? The survo:confused:

I know it's (mine Selecta) got new Pad's and that didn't make a difference on travel. Don't know if it would normally affect it much?

(y)
Click to expand...

I think that pretty much covers it. Just to add, if you have to apply a lot of physical pressure while braking, it's a good indicator that the servo isn't doing it's job. I was having to stand on the brakes to get stopped. I don't have to now.
 
carlt said:
The vacuum[not strictly anywhere near a vacuum , drop in pressure more like] is created in the servo from the suction at the manifold , the same suction that draws fuel / air mixture into the cylinders for combustion . there is a diaphragm in the servo , one side of which is the low pressure . when the brake is pressed the diaphragm moves by magic and exerts an increased force on the master cylinder .
The brakes on your new selecta are the best brakes I have had on a Panda , I would suggest that the increase in travel of the brake pedal on the old selecta is wear ?

Going back to Stuarts servo , the change in engine note is common when applying servo brakes on a small engine , change in manifold pressure . Obviously yours was worse as your leaking servo would have caused the engine to run lean as air is sucked into the manifold ,[ also common to have same when leak in servo pipe or connects]. If the master cylinder is leaking into the servo can get a nice smelly , white cloud out the exhaust every time the brakes applied , until the brake fluid runs out :eek:
Click to expand...

Sorry quoted the wrong quote if you get what I mean:eek:
 
See your not thinking straight, get the OH to take the wee yin to the show whilst you put yor feet up and have a little break ;) or every weekend get the OH to take the wee yin out to wherever for quality dad's time, that's when you put the kettle on stick the feet up and chill ;) ;)
 
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