Couple of days ago I opened her up and was hammering it round the bends as you do every so often, when I slowed down I had a slight whurring noise coming from the rear (drivers side I think). It is apparent even more so when driving at low speeds. It has got seriously loud now, any ideas what it can be seeing as I cant get to a garage until Monday, but need the car for then???
Serious grinding noise
- Thread starter the_dr38
- Start date
AndrewS
Member
Hi All,
From what is described, that sounds like a stone lodged between the rear brake disk and backing plate. When driving along, it drops to the bottom where this is clearance (hence no noise), when turning a corner it gets thrown up where it catches between the backing plate and brake disk.
Other possibilities could be a detached spring from one of the handbrake shoes (inside the rear disk) or the near side driveshaft rubbing against the exhaust.
Regards,
Andrew
From what is described, that sounds like a stone lodged between the rear brake disk and backing plate. When driving along, it drops to the bottom where this is clearance (hence no noise), when turning a corner it gets thrown up where it catches between the backing plate and brake disk.
Other possibilities could be a detached spring from one of the handbrake shoes (inside the rear disk) or the near side driveshaft rubbing against the exhaust.
Regards,
Andrew
Thanks aot for the replies, I need to drive it a long way evey day for the next few days so sounds like it is safe to do so. Another thing to mention is that sometimes when I pull away after first starting it there is a pin from the rear, maybe the handbrake is sticking too?
Sounds like the handbrake spring could be damaged as someone suggested above.
Mike
Mike
pauljmcnulty
Active member
It does sound as if the handbrake is sticking, you'll feel a clonk and a slight jolt as the shoes free off. Common with cars parked in the damp for a while, mine does it if it's not used fo a few weeks. More worrying is the grinding, if it's thrown, or about to throw, a handbrake shoe it'll be doing a lot of damage if you drive it. OK, the parts will need replacing but it's probably just the springs. Shoes are expensive.
When mine went, it was only driveable with the loose shoes removed, and the car left in gear. I'd check it out before driving a long way. Basically, it sounds like there's a whole load of bits of metal grinding around inside the rear wheel, regardless of cornering or not, and sensitve to road speed. Because, there is a load of metal grinding around inside the hub...[
]1st check has to be for a stone caught in the backing plate, though. Start with the simple!
smiffyraf1
New member
i had this a couple of weeks ago luckily had my tool bag in the car, took the back wheel off and the handbrake shoe retaining spring had come free and was grinding away inside the drum, luckily only done a few miles before i noticed and the damage to the spring which only was a bit bent could be repaired and refitted with pliers.
pauljmcnulty
Active member
The problem with mine was re-fitting.
My car was used as a demo at a Porsche Festival, the shoes were stripped down and re-fitted. Not using new springs all round, it wasn't a huge surprise in hindsight that the whole lot came apart. The springs are not re-useable, mine failed three times before I bit the bullet and had the lot replaced. By then, it included wrecked shoes at about £100 a set. Springs would have saved this, and three breakdowns. [
]ORIGINAL: pauljmcnulty
The problem with mine was re-fitting.
My car was used as a demo at a Porsche Festival, the shoes were stripped down and re-fitted. Not using new springs all round, it wasn't a huge surprise in hindsight that the whole lot came apart. The springs are not re-useable, mine failed three times before I bit the bullet and had the lot replaced. By then, it included wrecked shoes at about £100 a set. Springs would have saved this, and three breakdowns. [
WHAT? I just checked my receipt from Promax for mine less than 6 months ago and I paid £17 and change for all 4 shoes!! Plus about the same again for the retaining springs and the other springs that go on top and bottom! What on earth cost £100???
In response to the OP, I have no idea what wouldn't make a noise cold but does when warmed up... Theres no harm in checking the handbrakes though, IIRC its either 13 or 17mm socket you need. In fact I think the 2 bolts are different sizes......
EDIT: Its 19mm, I just took mine off to check the handbrake myself as it was sticking occasionally. They torque back up to 85nm/64ftlbs too.
pauljmcnulty
Active member
That was the price of the four shoes. All the springs and clips were on top. It was about five years ago, so maybe they are now available as a generic item, or one of those cases where Porsche just reduce the price for no apparant reason? [&:]
Thats scary, I got mine from Promax and I THINK Andy said they were generic to all Porsches of the era. They came with a little washers or something that are only used when fitting to the 964 or something. Are you absolutely sure the £100 was just the shoes and there wasn't something else on the bill?
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