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Thread: Slow braking

  1. 6th August 2013, 09:43 PM #1
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    Slow braking

    Hi everyone, I'm new to the forum but have recently bought a 1997 defender 300tdi dualcab. Loving it so far but find the braking is quite slow-essentially if I didn't down gear it would take quite a while to stop. The discs look fine but not sure of the pads yet. When I put the handbrake on I can actually rock the car slightly back and forth to a point. Anyone have any idea if the rocking and slow breaking are related?
    Thanks for your help.
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  2. 6th August 2013, 10:00 PM #2
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    Hand brake is a drum transmission brake at the rear of the t/case

    When you say slow, is the pedal 'hard' and high, or long ? (like a Japanese 4WD)

    If long, the brakes need bleeding, if high and hard it may be a booster problem.
    These things have a common problem of cracking the booster near the M/C, which obviously does wonders for the vacuum assistance.

    There's a valve in the booster that can give problems too apparently, or the vacuum pump can be cactus.
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  3. 6th August 2013, 10:04 PM #3
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    Hi rick130 Thanks for the response! It is high and hard. If I slam on them it does stop faster but if I press slowly it reached a hard point where it does not seem to really respond.
    Last edited by synthium; 6th August 2013 at 10:06 PM. Reason: Spelling
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  4. 6th August 2013, 10:20 PM #4
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    Unhappy

    Are there any simple tests to assess if it is the booster or vacuum?
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  5. 6th August 2013, 10:23 PM #5
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    booster sounds like it has no vac supply, or is split where the master cyl bolts to it, a common defender tdi problem. to check for vac, you need at least 15"Hg at idle at the pipe where it enters the booster, also check the pipework for leaks/ rubbing marks.

    jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
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  6. 6th August 2013, 10:27 PM #6
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    Thanks jc. I will have a look at it when I can ( at work for 12 hours tomorrow so hopefully time on Thursday!
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  7. 6th August 2013, 10:28 PM #7
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    Quote Originally Posted by synthium View Post
    Are there any simple tests to assess if it is the booster or vacuum?
    Hi
    With the engine running pull the vacuum hose out of the booster. There should be vacuum (air sucking in the pipe). If there is then I would be looking at the booster. Otherwise the pump has failed. I'm on my 4th pump in 400K.

    Regards
    Andrew
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  8. 6th August 2013, 10:32 PM #8
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    Thanks for that. Seems simple enough to do. Hopefully will have it worked out and resolved soon. Brakes are rather important.
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  9. 7th August 2013, 03:40 PM #9
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    Quick test is with the engine off put your foot hard on the brake, keep your foot on the brake and start the engine, the pedal should sink about an 1" if the servo is working, if not either a servo or vacuum pump issue.
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  10. 8th August 2013, 07:16 PM #10
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    I have taken the vacuum pump hose out of the booster while it was running and found there is suction, which pulses slightly. It is enough to suck onto my hand but easily pulled off. Unfortunately I do not currently have anyway to measure the "Hg. Does this seem too weak or do I really need to get a tool to actually measure the suction.
    I also did the test suggested by nedflanders and found that the pedal did not noticeably depress once I turned on the engine. Does this seem to be the booster? Anything else I should try?
    Thanks for all the help
    JP
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