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Odd ABS symptom
- Thread starter Ed Addis
- Start date
Just a couple of thoughts about tyres, which might have an effect. Are they evenly worn (similar tread depths all round)? Tyre pressures correct? Tyre age?
If you haven't got a constant ABS or PSM light, I doubt there is a fault, but a diagnostic check might be worth doing. Of course, the wet roads are a lot more slippery at the moment after a relatively long dry summer, so it might be as simple as that.
A thought: have you checked your handbrake shoes recently? They act on the inside of the rear brake disk bells.
Ed
Chris_in_the_UK
New member
http://www.reluctorrings.com/cars/porsche
On the C4 the front ABS sensor ring is fitted to the hub of the outer CV joint, but Porsche only supply the whole drive shaft at about £350, so I expect that is what they quoted for, not the CV joint alone.
If the part in Chris' link is correct for your car, it could be a result.
Perhaps a u/j would work and indeed despite the complexity of F1 suspension back in the late 60's and early seventues many a car had u/js on the rear axle. That said, cv joints are superior in a number of ways. The uj does not like being continuously deflected through too big and angle, and to keep the rotational speed contant, the stub axle for the wheel must remain parallel to the output shaft from the gear box. With fully independant multii link passive rear wheel steering this is not always the case in modern cars, in general and you can imagine how a wheel not rotating, accelerating, or decellerating evenly would upset the handling let alone the way the pasm works. I venture to suggest that the unsprung weight is greater with a uj than it is with a cv joint, and a rotating uj would then have greater momentum to be slowed/accelerated. Notwithstanding all that, u/js were not protected from the elements in the same way that cv joints areORIGINAL: Ed Addis
I've had a garage look at this now and it turns out that the N/S ABS ring is actually broken - a missing tooth, which causes the sensor to fire all the time. Apparently it's part of the front outer CV joint. Does anyone know where I can get this part at a sensible price, please? Porsche have quoted something like £350 for it! Haven't been able to find anything online, or on eBay. There are places that sell the rear inner joint, but I have to admit I can't understand why there have to be CV joints at the rear at all. I thought the CV joint was needed on front wheel drive cars to transmit drive through a flexible coupling?
Ed
Ed
Chris_in_the_UK
New member
If they do not suit, do a Google search for 'Porsche ABS Ring' it may throw up some others that may fit if the first link does not work out.
As its name implies a c/v joint gives a contant velocity out, given constant velocity in, no matter how out of parallel the driving and driven shfts are. If I was to add spanners to my signature to indicate competency I would be confident to add five.
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