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brake shudder

Discussion in 'VY Holden Commodore (2002 - 2004)' started by B-Man, Dec 25, 2015.

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  1. B-Man

    B-Man Member

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    I have an issue where the steering wheel shudders when braking. it doesn't happen all the time and does it at varying speeds. but mainly at the same places on the road. Ie. pulling into driveway
    I haven't had an issue with any other cars braking there.

    I did replace all brake pads with ac delco ones not long ago and both rear rotors (holden ones) as I was a little slow on the pad change and scuffed up 1 rotor

    It looks like the rotors had been replaced at some stage before my ownership as there was basically very little wear on them.

    The front disc's feel smooth and not rippley or warped or anything.

    could it be worn steering knuckles or.....?
     
  2. TI3VOM

    TI3VOM Active Member

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    Bushes maybe?
    What are the condition of the tyres like?
     
  3. DevilDRake

    DevilDRake Braaaap

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    You can also find that some rotors will warp under heat then go back down. I presume the rotors are not hot when you run your hand on them and they would of formed their original shape again.
     
  4. Reaper

    Reaper Tells it like it is.

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    My Adventra does this. Near certain it's cheap arse **** rotors. Will put something quality on there when I get around to it
     
  5. ozNick

    ozNick Active Member

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    Mine Adventra did too - they would shudder when hot, going down mountains in particular.

    Replaced all four rotors with RDA slotted and dimpled rotors and new pads, problem solved.
     
  6. strgas

    strgas GRA = REAL HP

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    Did you check hub run out and clean hub faces before fitting new disc's then check disc run out once fitted or just slapped them on out of the box
     
  7. B-Man

    B-Man Member

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    tyres are about half worn

    rotors are probably not even warm when it happens sometimes will feel them after braking.

    I haven't noticed the issue until a month or so ago.
    At that time I hadn't changed anything from when it wasn't happening to when it was.

    will see if getting them hot makes it worse

    only replaced rear rotors. but cleaned all surfaces didn't check runout
     
  8. Smashfist

    Smashfist Active Member

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    Steering wheel shudder when braking will be front rotors and nothing to do with the rears. Do you ride the brakes a lot down hills? Or have you gotten the brakes wet when they were hot lately (driven into a small amount of water/pressure cleaned the brakes etc)? Either get the front rotors machined or replaced, should fix it. There'll be a bit of runout on them.
     
  9. vc commodore

    vc commodore Well-Known Member

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    Steering wheel shudder under braking = warped front rotors.

    You replaced all brake pads, but only these rotors.....

    I'm sure you can work out where the problem is
     
  10. B-Man

    B-Man Member

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    quite obviously i know its in the front i was just giving the full story of what i had done.

    i only replaced the rear rotors cos the pad disintegrated and scuffed the rotor

    the front rotors feel fine and have bugger all wear on them. (no lip on the edge)

    i was thinking it could be the pads cos i didn't have the issue before replacing them.
     
  11. vc commodore

    vc commodore Well-Known Member

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    If you knew it was the front rotors, why ask what the problem is?

    Get them machined and see how you go
     
  12. adele_icm

    adele_icm New Member

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    Common issue we see often when replacing pads only and not machining/replacing rotors......
    Either machine front rotors or replace them with good quality rotors (RDA for example).
     
  13. B-Man

    B-Man Member

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    i knew it was the front area causing the issue quite obviously. i could hazard a guess it could be the rotors but thought it could be one of many things

    worn steering ends, the new pads not bead in properly, the rotors, tyres, wheel alignment, as its only intermittent whether the rotors are hot or cold it could be the section of road as i really notice it on the same spot each time yet other times at the same and different speeds on different roads it doesn't do it.

    so didn't want to throw a few $100 at rotors if it wasn't actually the issue.

    replaced my VS pads a few times without doing rotors and never had an issue. rotors did feel a little wavy on the fronts but still wasn't an issue so didnt realise the vy required machining.

    thanks guys will get the rotors checked out and machined/replaced on my next visit
     
  14. vc commodore

    vc commodore Well-Known Member

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    Wheel alignment, worn tie rods etc etc won't cause the issue you describe at any time.....Tyres will only cause a wobble if they're unbalanced for what ever reason......All these issues have been mentioned on here before.

    No offense to anyone, but you apply pressure to an uneven surface, with an object with an even surface, the answer is rather obvious.....Use that theory with the issue you are facing
     
  15. st3r3otyp3

    st3r3otyp3 Donating Member

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    try...BEDDING IN YOUR BRAKES....
     
  16. jeepyrocks

    jeepyrocks Member

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    Umm no one has mentioned caster rod bushes? On vt onwards these are renowned for leaking their fluid out over time (they are hydraulic), becoming stupidly soft and causing brake pulsation.
    OP, how many kms has the car done. Google caster rod bushes - there is a simple way to have someone watch while you brake at low speed to see if there is front end movement (you wont miss it).
     
  17. markovr

    markovr Well-Known Member

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    someone lately mentioned this
    not sold but worth checking out
     
  18. baza

    baza Member

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    If your steering wheel shudders or shakes , the problem would be tyres maybe with wheels out of balance or steering or suspension fault . if the brake rotors are warped you will feel them pulsing thru the brake pedal when you apply brakes.
     
  19. goony

    goony New Member

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    if it's not already clear:

    IF you feel pulsing/vibration in the brake pedal and steering wheel in time, together; then machine or replace the front discs.

    my wagon had the same issue when i bought it, under various braking conditions.

    I bought quality discs from an online site and have been up and down the Aus alps 6* and put 30,000 on them now going hard with no worries.

    good luck should be simple fix.
     
  20. vc commodore

    vc commodore Well-Known Member

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    Not entirely correct.....If the steering wheel shudders or wobbles under braking, it's not a wheel balance issue, nor suspension issue......It's the front rotors....If the steering wheel wobbles under normal driving, then it's a balance issue...

    If the brake pedal pulses under braking, the rear rotors are too blame
     

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