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| hot_eb |
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Hi, I have an au2 that has a knock in the front left.
The pre condition for it is moderate to hard braking. Then when you accelerate it knocks again. If you brake lightly, it won't knock. You can also accelerate as hard as you like and it won't knock after light braking. I noticed it also does it when hitting big bumps like a pothole. I went to my usual mechanic, who put it up on the hoist and said visually everything looked fine. Car has done 100,000 kms Thought on what I should try first? |
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| bry40l |
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Ball joints? tie rod ends?
_________________ BF XR6 |
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| Papa Smurf |
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Front Hub, Front lower ball joint and then lower control arm bushes and upper control arm bushes. Have all the bolts and nuts been tightened on the front? Are your Calipers ok? does it look like you need new pads?
Have you looked at BOTH side calipers and seen if the wear on the pads is about the same? Check to see if your Calipers are moving free? Wouldn't hurt to have ALL of that checked and while you are at it, check the Shocks and springs. |
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| hot_eb |
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[flash=][/flash]Thanks for the quick responses!
Mechanic says ball joints are fine. Cars had new rotors, pads, shocks, shock mounts and d bushes in last 2000kms. It knocked before and after those changes were made. Upper arms done about 20k ago. I immediately thought lower control arm, but these are expensive so don't want to change for the hell of it. Aparantly the front is hydraulic and whilst they can look ok they can be split. How do you test things like hubs and lower arms? |
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| Papa Smurf |
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Spinning the Hubs will tell you if there is any wear in the bearings in the hubs, when they are work they will give a kind of grating sound or will have free play when you put load on them.
With the Ball joints, did he TEST them or just a visual? The lower Control arm bushes can be a pain and DO necessitate removal to change. Did anyone check that the guide pins on the Calipers were greased and free moving? some people just change pads and never check things like that. One other thing, check the sway bar links, they can attribute to a front end knock. |
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| hot_eb |
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Papa Smurf wrote: Spinning the Hubs will tell you if there is any wear in the bearings in the hubs, when they are work they will give a kind of grating sound or will have free play when you put load on them. With the Ball joints, did he TEST them or just a visual? The lower Control arm bushes can be a pain and DO necessitate removal to change. Did anyone check that the guide pins on the Calipers were greased and free moving? some people just change pads and never check things like that. One other thing, check the sway bar links, they can attribute to a front end knock. Yeah he tested them. Will check bearings and guide pins tomorrow. When you say check sway bar links, is it just that they are tight or is there something else to look for? |
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| OZBMX |
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I could bewrong if this will matter but hey the link pins to sway bar are weak as a b**ch C***.
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| Papa Smurf |
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Sway Bar link are the double ended ball joint type link that secure the sway bar to the lower control arm. Has this vehicle been involved in hitting the gutter on the left hand side?
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| hot_eb |
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Papa Smurf wrote: Sway Bar link are the double ended ball joint type link that secure the sway bar to the lower control arm. Has this vehicle been involved in hitting the gutter on the left hand side? It's funny you asked that Papa smurf...I noticed a chunk out of the side wall of the tyre so I would say it's a possibility (it's my wife's car). She couldnt tell me when it may have happened so can't relate it to when the knock started. Could this be the culprit? |
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| Papa Smurf |
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Well, the brackets that hold the sway bar to the body can get damaged very easily and you really have to take a look sometimes to see it, the brackets are easily changed as they are only held on by bolts, either hex head or allen key.
Part number for R/H BA2 5B482 A $31.00 and L/H AU2 5B482 C $32.85. |
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| hot_eb |
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Papa Smurf wrote: Well, the brackets that hold the sway bar to the body can get damaged very easily and you really have to take a look sometimes to see it, the brackets are easily changed as they are only held on by bolts, either hex head or allen key. Part number for R/H BA2 5B482 A $31.00 and L/H AU2 5B482 C $32.85. Bearings are ok. Guide pins are lubed. Brackets look fine, although there Is a slight bend in them on both sides. Should they be dead straight? thanks for the part numbers. Last edited by hot_eb on Mon Jun 13, 2011 2:27 pm, edited 3 times in total. |
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| 89.SVO |
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Age: 34 Posts: 3379 Joined: 11th Mar 2008 Ride: EA SVO, AU2, Toyota Crown Location: Bendigo |
AU's don't have castor rods like early Falcons do they? i was thinking castor rod bushes. but they changed the lower arm design in AU
_________________ Daily driver: 2010 Toyota Crown hybrid 3.5L V6 hybrid. 254kw. |
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| hot_eb |
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WILDEB wrote: AU's don't have castor rods like early Falcons do they? i was thinking castor rod bushes. but they changed the lower arm design in AU No castor rods - they have the ba style lower control arm. I read the front bush is hydraulic and even when worn can still look like new. I am not convinced it is the arm though as it sounds like a high knock, but the fact it happens after moderate to hard braking makes me feel it could be lateral movement in the lower arm. Was hoping someone else had a similar problem to confirm it for me before I give up a few hundred tokens on remanufactured arms! Anyone know what the service life of the lower arms is? |
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| Papa Smurf |
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I got 170,000 klms out of my original arms before I changed to the BA lower ones. It might be worthwhile to take it to a suspension place, they have more experience.
Short of that, I can recommend one guy who won't screw you, he is a sponsor on this site and is at Liverpool, Joe from Crescent Motor Sport. |
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| hot_eb |
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Papa Smurf wrote: I got 170,000 klms out of my original arms before I changed to the BA lower ones. It might be worthwhile to take it to a suspension place, they have more experience. Short of that, I can recommend one guy who won't screw you, he is a sponsor on this site and is at Liverpool, Joe from Crescent Motor Sport. Thanks Papa Smurf. I took it to pedders - they did a safety check and said lower arms and $1100 to do it. Out of interest, how did you know your arms needed replacing Papa Smurf? |
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