How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Mike Your Own Question
Mike, Technician
Category: Car
Satisfied Customers: 39198
Experience:  Tech Expert
Type Your Car Question Here...
Mike is online now

I have a 2010 SAAB 9-5 Auto Diesel Estate where brake warning

This answer was rated:

I have a 2010 SAAB 9-5 Auto Diesel Estate where brake warning chime & light (briefly) comes on after braking i.e. after brake pedal has been released. Brakes have been checked & nothing has been picked up on diagnostic check. What might be the cause of this?
Hello and Welcome..

My name is XXXXX XXXXX Im happy to help you...

Did you have the diag tests done when the fault light was on / coming on?

Do you happen to know what sort of test equipment was used / what type of garage did the tests?

When it occurs - how does the pedal feel?

What mileage does the car have ?

Rgds, MIKE..........................................
Customer: replied 4 years ago.
Hi Mike, here are the answers to your questions:
Fault was not there when check done.
Do not know type of machine, but it is a Saab specialist & told that equipment should have indicated previous fault. (I have not been charged by garage.)
Pedal feels quite normal but I should say that "alarm" came on yesterday, before I released the pedal.
Car has done 42,000.

Leave it with you.


Hello there Bob -

Thank you for your reply and further info -

Given what you have described, this is usually a fault wither in the vacuum system - ie, servo, servos circuit valve, or vacuum pump - or, a fault with the Abs pump .

The problem at the moment silly as it sounds, its not bad enough , for the Ecu to detected the fault and out the fault lights on - meaning there would be then fault codes logged - which on test - would highlight which of the faults above is the cause.

When I asked about when it was tested, this is as I thought - with no faults showing on the dash - or the fault not there / happening - then it wont register on the machine... so that is not really a waste of time - in that it backs up what Ive said above.

SO - essentially, the fault is going to have to manifest itself more so - so that the computer ( ecu ) detects it properly and switches the fault light on permanently - and hence, that then is the time to have the diagnostics done... because as again as above, there will be fault codes then to determine the fault cause properly - and then it can be fixed.

The only other way is to physically replace parts in the system - substitution - as you can imagine, that is an expensive way of doing so not recommended !

So while don't really like saying in Bob - that is what you are going to have to do as above - wait until the fault manifests itself more so - at which point, the dash will tell you and again - that then is the time to have the plug in tests done ...and you are there then!

There really is no need for worry meantime - you have had all the brakes checked out so no worries there - so thats the way forward now on this one Bob.. Im sorry I can't be more specific - but I hope you can see why from the above -

Let me know how you get on if you wish- or if you need anything else at all.

Kind Rgds - MIKE.

...Meantime..............Please do click on the "OK/ Excellent ratings" for me as that's how Im credited for helping you - Thank you in advance for that...

You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..

Rgds, MIKE.
Mike and other Car Specialists are ready to help you