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Thread: Brake smell on first startup

  1. #1
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    Brake smell on first startup

    Hi all,
    I am getting a brake smell on the first startup of the day, but only sometimes and only after it was driven the day before.
    Discovery 4 2013, 3.0l SDV6 HSE.

    Can be smelt inside and outside the car.

    Thoughts.

  2. #2
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    I don't have any immediate ideas on what it could be. However, to clarify, do you mean it smells like hot brakes as if you'd ridden the brakes down a super steep hill or like brake fluid burning?

    One of the uber experts will have some thoughts after first coffee I'm sure! Haha

    Good luck bud.
    -------------------------
    Chris Phillips


    Offroader: 1996 Discovery 300TDI (The Green Donkey)
    Missus: 2010 Discovery 4 TDV6 (Fancy thing)
    Just 'cause: 1999 Discovery SE 3.9L V8 (Makes fun noises, sometimes...)
    Spares: 1998 Discovery 300TDI (Only vehicle actually in the garage..........)

    Run around:
    2001 Nissan Pulsar ST 1.8L (Soul crusher)

  3. #3
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    Quote Originally Posted by libertyts View Post
    I don't have any immediate ideas on what it could be. However, to clarify, do you mean it smells like hot brakes as if you'd ridden the brakes down a super steep hill or like brake fluid burning?

    One of the uber experts will have some thoughts after first coffee I'm sure! Haha

    Good luck bud.
    Hot brakes, not fluid, seems to come from front of car

  4. #4
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    No DPF.

  5. #5
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    Fair enough. I don't have any immediate ideas unfortunately. There are few things in modern cars that have a pretty similar smell.

    Any squeaking, squealing or rumbling at those times that might indicate something rubbing?

    Does the smell appear immediately on startup or does it take a little bit of time? Any ideas if it starts at the front or the back? I know ours 2.7L smells a little on first start in the morning from the exhaust, is gone pretty quick and I wouldn't describe it as hot brakes though.

    Fingers crossed one of the brighter sparks pops in soon!
    -------------------------
    Chris Phillips


    Offroader: 1996 Discovery 300TDI (The Green Donkey)
    Missus: 2010 Discovery 4 TDV6 (Fancy thing)
    Just 'cause: 1999 Discovery SE 3.9L V8 (Makes fun noises, sometimes...)
    Spares: 1998 Discovery 300TDI (Only vehicle actually in the garage..........)

    Run around:
    2001 Nissan Pulsar ST 1.8L (Soul crusher)

  6. #6
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    Quote Originally Posted by libertyts View Post
    Fair enough. I don't have any immediate ideas unfortunately. There are few things in modern cars that have a pretty similar smell.

    Any squeaking, squealing or rumbling at those times that might indicate something rubbing?

    Does the smell appear immediately on startup or does it take a little bit of time? Any ideas if it starts at the front or the back? I know ours 2.7L smells a little on first start in the morning from the exhaust, is gone pretty quick and I wouldn't describe it as hot brakes though.

    Fingers crossed one of the brighter sparks pops in soon!
    Nothing.
    Starts immediately.
    Except this morning Brake smell on first startup, no smell.

  7. #7
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    Bugger, I've run out of ideas and silly questions. One of the other fellas will see this soon and will likely know it immediately. Smart arses.... Brake smell on first startup
    -------------------------
    Chris Phillips


    Offroader: 1996 Discovery 300TDI (The Green Donkey)
    Missus: 2010 Discovery 4 TDV6 (Fancy thing)
    Just 'cause: 1999 Discovery SE 3.9L V8 (Makes fun noises, sometimes...)
    Spares: 1998 Discovery 300TDI (Only vehicle actually in the garage..........)

    Run around:
    2001 Nissan Pulsar ST 1.8L (Soul crusher)

  8. #8
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    Well, I've pondered this over my morning espresso but I'm bereft of a possible cause. It may be some fluid on the exhaust. So the first thing I'd do is remove the engine cover and the other two covers and have a good look around with a bright torch. It all should be dry under there, so any fluids should be quite noticeable.
    2013 D4 expedition equipped
    1966 Army workshop trailer
    (previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)

  9. #9
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    Quote Originally Posted by DieselLSE View Post
    Well, I've pondered this over my morning espresso but I'm bereft of a possible cause. It may be some fluid on the exhaust. So the first thing I'd do is remove the engine cover and the other two covers and have a good look around with a bright torch. It all should be dry under there, so any fluids should be quite noticeable.
    Will do

  10. #10
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    I'm willing to bet it smells like a mixture between hot brakes and that characteristic acrid diesel exhaust smell you get when first starting up, and stronger around the front of the car...

    I believe it would be the EGR valves leaking where the alu pipes flange off the valve and head up towards the manifold. EGRs located down the side of the engine. Both sides. Check with a torch for soot build up on top of the EGR.


    Reason for no smell would be that valves were closed fully on last startup.

    Mine did the same, could smell exhaust/hot brakes after coming home. Relatively easy to fix, unbolt the EGR pipes from the manifold and retaining clips, then from the EGR valve itself, clean up the flange faces and apply some high temp gasket maker and refit. Need small hands and a 10mm socket with a long extension, and don't drop the flange bolt in between the valve and engine, don't want to go there (again)....

    Whilst there, you can actuate the egr rod with your finger, the rod is a black plastic one connected to a dash pot thats connected to a vac line. It should move freely. If not, when the return pipe is off you can get a hooked scraper in there and scrape away the carbon build up. I also spray some throttle body cleaner in there.

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