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S60 & V60 '18> / XC60 '17> / S90 & V90 '16> / XC90 '15> General Forum for the SPA-platform 60- and 90-series models |
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Brake Pedal Force to Start CarViews : 1202 Replies : 10Users Viewing This Thread : |
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Jul 13th, 2020, 21:23 | #1 |
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Brake Pedal Force to Start Car
Not driving my car much these days and noticed that after it’s been sat for a while the brake pedal goes rock hard. That’s fine, my Merc used to do the same. However the sensor for detecting my foot on pedal to allow me to start car must be way down the travel or the pedal because I have to proper force the pedal to get the car to allow me to start it.
Is this normal? Feels wrong. The Merc used to make pedal rock hard, but would always start with very little pressure required on pedal.
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Jul 13th, 2020, 21:50 | #2 |
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I’ve had exactly the same for the last month or so on my V90 T5 2018, although I’ve been using mine every day. Will be interested also if anyone has an answer..
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Jul 13th, 2020, 22:29 | #3 |
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the likeliest cause is no vacuum in the servo , press really hard on the pedal & happy days , away you go . Without any vacuum the pedal feels like it has been set in cement , once the engine fires vacuum is generated .
As a last resort reach up the brake pedal & remove switch , you should be able to start engine . Switch is push in clip out
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Jul 14th, 2020, 07:40 | #4 |
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Some systems get the (pedal depressed) signal from a pressure switch in the ABS module, not sure if your model of Volvo will use this .
Maybe a trip to the dealer and some electrickery is required?
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Jul 14th, 2020, 08:26 | #5 |
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Has happened to me several times. First time it happened I was convinced car was broken and called Volvo asssitance. Just needs really hard push to reach sensor. Not experienced on any other make.
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Jul 14th, 2020, 08:41 | #6 |
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Had exactly yah same in my xc60 SPA, it does seem a little odd but the only good thing I can see is if it was to be so bad that it would not start I would 99% be at home as once it starts the vacuum is back and no problems on the next start.
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Jul 14th, 2020, 09:39 | #7 |
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Thanks for all the replies.
Sounds like it’s just a quirk of Volvo then. Whether by deisgn or omission. Will mention it when I next need to visit dealer for something and see what they say, but sounds “normal”.
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Jul 14th, 2020, 10:35 | #8 |
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At MOT time(to test) the servo should be expelled of air by pumping the pedal and then starting with pressure applied so it shouldn't be a "problem" to start the car in this way?
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Jul 14th, 2020, 11:19 | #9 |
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I'm assuming this is an auto box? Your pedal sensor may be faulty, with the XC90 the pedal was hard but only required to be pressed a very small amount to allow the engine to start, more like just force on pedal rather than actual pedal travel.
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Jul 14th, 2020, 11:32 | #10 |
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Thanks for telling us about being able to unplug the sensor connection. That's useful to know.
I shall have a nosey under the dash at my earliest convenience. |
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