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Thread: Brakes on a 130 300tdi

  1. 28th September 2015, 03:35 PM #1
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    Brakes on a 130 300tdi

    I have noticed that the brakes on my 95 300tdi 130 don't bite too well. I can't lock the wheels at all on gravel or bitumen. That can't be right.

    Pads and rotors were replaced by previous owner, I have done about 40k km on them. Don't know what brand they are.

    Pump vacuum is between 5 and 20 in Hg, depending on engine speed. Should be enough?

    Does anyone have any recommendations on pads? I don't mind dust or fast wear. I am very easy on brakes.

    The brake manufacturer websites are useless, they talk about things like "hybrid fusion and stealth technology" whatever that is....

    Cheers,
    Terry
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  2. 28th September 2015, 04:42 PM #2
    mudder110
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    brakes

    sounds like a vacuum pump or booster problem if the pedal is hard after start up id be checking vacuum pump and booster,trw pads are ok cheers
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  3. 28th September 2015, 07:12 PM #3
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    Don 130
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    I use genuine pads after a mechanic fitted aftermarket and the screeching could be heard several suburbs away.
    Check the front of your booster for cracks around the mounting bolts. It's a common issue. The cure is a new booster, and if yours is cracked, you'll notice a big difference in braking performance when the new one goes on.
    Don.
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  4. 29th September 2015, 06:44 AM #4
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    Thanks Don & Mudder, couple of things to check.
    Vacuum is 20 in Hg, I don't think a little plastic pump would do better than that.
    Genuine pads sounds like a good idea.

    Terry
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  5. 29th September 2015, 06:57 AM #5
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    Check the booster near where the master bolts on. Very common for them to crack. Crack opens when peddle pressure applied which then leaks all your vacuum away. I assume you have checked the vacuum from the pump upstream of leak.

    Very common fault.
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  6. 29th September 2015, 07:03 AM #6
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    Good call, maybe I had better check the vacuum with a tee in the line.
    Thanks.
    Terry
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  7. 29th September 2015, 07:13 AM #7
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    A tee in the line and applying peddle pressure will open any hairline crack and leak off vacuum.

    S
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  8. 30th September 2015, 08:45 PM #8
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    Problem is found - I think
    Vacuum direct connection to gauge 20 in Hg max
    Vacuum with gauge teed into line 8 in Hg max
    Won't hold vac with engine stopped.

    Can't see any cracks, might be the diaphragm

    Terry
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