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E39 Vibration on Braking - help please !
I have vibration of the sterring wheel on braking on an E39. There's
no vibrattion through the brake pedal. Just had a diagnosis from a garage - "brake discs (rotors) need replacing". On reading the Brake FAQ I see that worn suspension bushes can cause vibration of the stereing wheel. The vibration is worse at higher speeds. I would have thought that warped rotors would be felt through the pedal as well as the steerrng wheel. I'm on a tight budget, and don't want to replace the brake discs unecessarily. Can someone confirm that warped rotors would be felt through the brake pedal ? Or not ? I'd also be interested in the difficulty (i.e. cost) of replacing the suspension bushes *& which ones need to be replaced. Its a E39 528i 50K miles. Any help appreciated |
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#2
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E39 Vibration on Braking - help please !
"holdgaj" > wrote in message ... >I have vibration of the sterring wheel on braking on an E39. There's > no vibrattion through the brake pedal. Just had a diagnosis from a > garage - "brake discs (rotors) need replacing". That's my diagnosis too. Warped rotors can be felt through the pedal, but they are not always felt there. They are felt in the steering wheel. I can't address the difficulty of replacing the bushings, but I've heard here many times that it is a DIY-kind of job. If you have the ability to install new rotors, you can do the bushings. Warped rotors are a result of heat, which is a byproduct of worn brake pads. The pad material, when thick, does not generate much heat at the surface. When the pads wear, the heat that normally sinks out of the pad backing plates does not sink as well, the pad material acts as a heat sink/insulator when the pads are new, and this characteristic is lost as the pads wear out. If the pads are close to end life, AND you have to mash the brakes to stop short from a relatively high speed, then the heat generated can warp the rotors. If the pads are new under the same conditions, the rotors will survive the ordeal and work well for the next stop. When the pads are worn, the next stop can be shakey. The suspension parts (bushings) will generally load up under braking, and remain under the constant load until you stop. This means that the worn bushings can cause noises when going over speed bumps or on rough roads, where the suspension parts move around, or they can cause the car to pull to one side as the geometry changes under braking. Suspension parts (bushings) do not generally cause shaking under braking. You may need bushings, this is common, but I'm not sure that shaking is the first sign. Indeed, worn bushings can make the effects of warped rotors even worse, but if the rotors are in good shape, you ought not notice worn bushings during braking. You should be able to replace both rotors and all four pads -- always replace brake parts in Axle Sets, never peice-meal brake service -- for about $100-ish in parts. On reading the Brake > FAQ I see that worn suspension bushes can cause vibration of the > stereing wheel. The vibration is worse at higher speeds. I would have > thought that warped rotors would be felt through the pedal as well as > the steerrng wheel. I'm on a tight budget, and don't want to replace > the brake discs unecessarily. Can someone confirm that warped rotors > would be felt through the brake pedal ? Or not ? I'd also be > interested in the difficulty (i.e. cost) of replacing the suspension > bushes *& which ones need to be replaced. > > Its a E39 528i 50K miles. > > Any help appreciated > |
#3
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E39 Vibration on Braking - help please !
On Thu, 28 Aug 2008 08:48:53 -0700 (PDT), holdgaj
> wrote: >I have vibration of the sterring wheel on braking on an E39. There's >no vibrattion through the brake pedal. Just had a diagnosis from a >garage - "brake discs (rotors) need replacing". On reading the Brake >FAQ I see that worn suspension bushes can cause vibration of the >stereing wheel. The vibration is worse at higher speeds. I would have >thought that warped rotors would be felt through the pedal as well as >the steerrng wheel. I'm on a tight budget, and don't want to replace >the brake discs unecessarily. Can someone confirm that warped rotors >would be felt through the brake pedal ? Or not ? I'd also be >interested in the difficulty (i.e. cost) of replacing the suspension >bushes *& which ones need to be replaced. > >Its a E39 528i 50K miles. > >Any help appreciated This is general information. I don't know jack about BMWs. On my chevy van you can feel warped rotors through the brake pedal but not through the steering wheel and only while braking lightly when coming very slowly to a stop. There's kind of a side-to-side "swims like a fish" wobble feeling the last 5 feet before the van stops. The disks can be turned for $25 each where I live. A sophisticated car like yours should warn you well before brake parts start overheating to the point they warp the rotors is my guess. Even my '88 325 has a dash light that tells you if the pads need replacing. This kind of heat happens when the calipers are stuck closed from rust on the slides maybe. Also, filthy brake fluid can have rust in it which plugs up the return line so the calipers stay partially on. That makes the brakes drag and then they heat up the rotors. This should be obvious when you tear down to replace or turn the rotors. Good luck and happy motoring. |
#4
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E39 Vibration on Braking - help please !
holdgaj > wrote:
>I have vibration of the sterring wheel on braking on an E39. There's >no vibrattion through the brake pedal. Just had a diagnosis from a >garage - "brake discs (rotors) need replacing". On reading the Brake >FAQ I see that worn suspension bushes can cause vibration of the >stereing wheel. The vibration is worse at higher speeds. I would have >thought that warped rotors would be felt through the pedal as well as >the steerrng wheel. I'm on a tight budget, and don't want to replace >the brake discs unecessarily. Can someone confirm that warped rotors >would be felt through the brake pedal ? Or not ? I'd also be >interested in the difficulty (i.e. cost) of replacing the suspension >bushes *& which ones need to be replaced. > >Its a E39 528i 50K miles. Your rotors are bad, yes. Change them; it's an easy job and not too expensive to do. When did you last do a brake job? At 50k, you should be coming up ready for a whole pile of preventative maintenance. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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E39 Vibration on Braking - help please !
In article
>, holdgaj > wrote: > I have vibration of the sterring wheel on braking on an E39. There's > no vibrattion through the brake pedal. Just had a diagnosis from a > garage - "brake discs (rotors) need replacing". On reading the Brake > FAQ I see that worn suspension bushes can cause vibration of the > stereing wheel. The vibration is worse at higher speeds. I would have > thought that warped rotors would be felt through the pedal as well as > the steerrng wheel. I'm on a tight budget, and don't want to replace > the brake discs unecessarily. Can someone confirm that warped rotors > would be felt through the brake pedal ? Or not ? I'd also be > interested in the difficulty (i.e. cost) of replacing the suspension > bushes *& which ones need to be replaced. It is very likely the control arm bushes if the vehicle has done more than about 70,000 miles and they are original. Unfortunately, as they're fluid filled, it's difficult to tell if there are worn by levering etc as they have some 'give' when perfect. They can be replaced with the correct workshop equipment, but few will have this so just replace the entire arm. IMHO it's far more likely to be the cause than warped discs. Even although most mechanics who don't know this model will diagnose that. -- *The statement below is true. Dave Plowman London SW To e-mail, change noise into sound. |
#6
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E39 Vibration on Braking - help please !
On 28 Aug, 20:12, (Scott Dorsey) wrote:
> holdgaj > wrote: > >I have vibration of the sterring wheel on braking on an E39. There's > >no vibrattion through the brake pedal. Just had a diagnosis from a > >garage - "brake discs (rotors) need replacing". On reading the Brake > >FAQ I see that worn suspension bushes can cause vibration of the > >stereing wheel. The vibration is worse at higher speeds. I would have > >thought that warped rotors would be felt through the pedal as well as > >the steerrng wheel. I'm on a tight budget, and don't want to replace > >the brake discs unecessarily. Can someone confirm that warped rotors > >would be felt through the brake pedal ? Or not ? I'd also be > >interested in the difficulty (i.e. cost) *of replacing the suspension > >bushes *& which ones need to be replaced. > > >Its a E39 528i 50K miles. > > Your rotors are bad, yes. *Change them; it's an easy job and not too > expensive to do. > > When did you last do a brake job? *At 50k, you should be coming up ready > for a whole pile of preventative maintenance. > --scott > -- > "C'est un Nagra. *C'est suisse, et tres, tres precis." Could you give me an idea of exactly what preventitive maintainance I should be doing - as mentioned above, I might as well have the garage do it at thye same time they do the rotors ... |
#7
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E39 Vibration on Braking - help please !
On 29 Aug, 00:58, "Dave Plowman (News)" > wrote:
> In article > >, > * *holdgaj > wrote: > > > I have vibration of the sterring wheel on braking on an E39. There's > > no vibrattion through the brake pedal. Just had a diagnosis from a > > garage - "brake discs (rotors) need replacing". On reading the Brake > > FAQ I see that worn suspension bushes can cause vibration of the > > stereing wheel. The vibration is worse at higher speeds. I would have > > thought that warped rotors would be felt through the pedal as well as > > the steerrng wheel. I'm on a tight budget, and don't want to replace > > the brake discs unecessarily. Can someone confirm that warped rotors > > would be felt through the brake pedal ? Or not ? I'd also be > > interested in the difficulty (i.e. cost) *of replacing the suspension > > bushes *& which ones need to be replaced. > > It is very likely the control arm bushes if the vehicle has done more than > about 70,000 miles and they are original. Unfortunately, as they're fluid > filled, it's difficult to tell if there are worn by levering etc as they > have some 'give' when perfect. > > They can be replaced with the correct workshop equipment, but few will > have this so just replace the entire arm. > > IMHO it's far more likely to be the cause than warped discs. Even although > most mechanics who don't know this model will diagnose that. > > -- > *The statement below is true. * > > * * Dave Plowman * * * * * * * * London SW > * * * * * * * * * To e-mail, change noise into sound. Any idea what this might cost (replacement of the bushes ) I just had a quoute of 800Euro for the job ... Seems like a lot ... |
#8
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E39 Vibration on Braking - help please !
holdgaj > wrote:
> >Could you give me an idea of exactly what preventitive maintainance I >should be doing - as mentioned above, I might as well have the garage >do it at thye same time they do the rotors ... Well, at 50K you should be doing brake fluid, transmission fluid, differential fluid. Probably the usual filter change too (and that includes the fuel filter), and maybe a coolant flush. The point about loose bushings causing similar vibration problems is a good one, and you should definitely have a mechanic go over your front end. If the bushings are loose, the brake rotors will get worn unevenly too, so just because you find the bushings are bad doesn't mean you can ignore the brakes. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
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E39 Vibration on Braking - help please !
"holdgaj" > wrote in message ... >I have vibration of the sterring wheel on braking on an E39. There's > no vibrattion through the brake pedal. Just had a diagnosis from a > garage - "brake discs (rotors) need replacing". On reading the Brake > FAQ I see that worn suspension bushes can cause vibration of the > stereing wheel. The vibration is worse at higher speeds. I would have > thought that warped rotors would be felt through the pedal as well as > the steerrng wheel. I'm on a tight budget, and don't want to replace > the brake discs unecessarily. Can someone confirm that warped rotors > would be felt through the brake pedal ? Or not ? I'd also be > interested in the difficulty (i.e. cost) of replacing the suspension > bushes *& which ones need to be replaced. > > Its a E39 528i 50K miles. > > Any help appreciated > If your car has only 50k miles, you should be consulting the Owner's Manual for the recommended service. My recollection is the 50k service is mostly fluid level checks. Depending on your driving habits, the front brakes are toast, and are screaming for replacement. I seriously doubt the suspension bushings are playing into your shaking. |
#10
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E39 Vibration on Braking - help please !
In article >,
Scott Dorsey > wrote: > >Could you give me an idea of exactly what preventitive maintainance I > >should be doing - as mentioned above, I might as well have the garage > >do it at thye same time they do the rotors ... > Well, at 50K you should be doing brake fluid, transmission fluid, > differential fluid. Probably the usual filter change too (and that > includes the fuel filter), and maybe a coolant flush. Brake fluid and coolant changes are part of routine servicing. -- *A clear conscience is usually the sign of a bad memory * Dave Plowman London SW To e-mail, change noise into sound. |
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