Cayman - Ordering Brake replacement components

[Eriedor]

My discs are getting quite worn and thinking I may replace them a bit early as eurocarparts have 30% off brake components and I'm planning a few track days soon.

Pads/Discs and Sensors are sorted however I'm confused about the shims, the site states "priced per axle" but also that 4 are required, does that mean there's two in a pack and 4 required per caliper hence 8 per axle in total? Also the rear dampening discs come in two sizes - 28mm and 30mm, which would a cayman s require?

Finally I've been quoted 3 hours work for fitting all 4 which seems a bit excessive to me, I thought it would be more like 2.

[mrdemon]

it's not even 2 hours

2 bolts for the calipers. one holding screw for the disks, pads just slide in and out with a pin.

2 hours to do it your self with a trolly jack one side at a time may be.
with a ramp 1 hour max.

You need to buy new caliper bolts though, and I always buy a new holding screw.

track days and oem pads though is a big no no imo, RS29's are your friend if you want to do more than 2 laps :-)
RS 42's for a good all round pad

you can get parts here also a bit cheaper
http://www.motordrive.com/acatalog/Braking.html


edit to say thought you were only doing the front's but still 2 hours no issue for a pro on a ramp for all 4.

Edited by mrdemon on Tuesday 22 May 23:33

[pete.g]

You can re-use the shims. As you're doing discs as well as pads you'll be removing the caliper, which means you can remove the pads with the shims attached. Once the old pads are out then you may need to use a thin blade to remove the old shims (they may already be loose) and then attach them to the new pads, using a little dab of anti-squeal - there may also be some locating indents in the pads (if you're using OEM).

If you're using track pads you don't need the shims - there's lots of discussion about this on the U.S websites.

Other top tips: use an impact driver for the disc location screws and be aware that the older caliper bolts are a Hex fitting and the new ones a Torx fitting, so you may need both of these. You should always replace caliper bolts - genuine Porsche are about £2.50 apiece, so it's £10 well spent.

With the ECP discount the parts bill is bearable - certainly a lot better than OPC prices, usually for exactly the same parts.

[S1MMA]

anonymous said:

[redacted]

Usually bolts need replacing because they either stretch or have locking compound applied

[LindsayMac]

S1MMA said:

Usually bolts need replacing because they either stretch or have locking compound applied

Pete

Surely there must be another reason, bolts will only be stretched if they are over torqued. Locking compound should make little to no difference, if it was critical you could need to change both the bolts and whatever they were threaded into?

[pete.g]

LindsayMac said:

S1MMA said:

Usually bolts need replacing because they either stretch or have locking compound applied

Pete

Surely there must be another reason, bolts will only be stretched if they are over torqued. Locking compound should make little to no difference, if it was critical you could need to change both the bolts and whatever they were threaded into?

I believe both S1MMA's responses are correct - the bolts have a coating, and once they are torqued up they use the inherent stretch to maintain tightness. There is the possibility of them loosening if they are reused (i.e. torqued up again). As they cost less than £3 each for the genuine article it seems a false economy not to change them. I did not change the shims when doing the brakes on my Cayman as they are only for squeal prevention and many track cars do without them entirely.

[LindsayMac]

pete.g said:

I believe both S1MMA's responses are correct - the bolts have a coating, and once they are torqued up they use the inherent stretch to maintain tightness. There is the possibility of them loosening if they are reused (i.e. torqued up again). As they cost less than £3 each for the genuine article it seems a false economy not to change them. I did not change the shims when doing the brakes on my Cayman as they are only for squeal prevention and many track cars do without them entirely.

Thanks, that is really good information to have.

[Eriedor]

Thanks for the advice everyone,

The car isn't track dedicated I just do few a year so don't think track dedicated pads are necessary. I'll ask the garage about replacing shims, my thoughts are might as well replace them while the brakes are being refreshed. Does anyone know which size is necessary for the rears? 28mm or 30mm?

[pete.g]

4 of each. You'll see which goes where when you look at the old ones.

[cslwannabe]

My local OPC quoted me 3 hrs labour when I was at the free health check this morning - £1000 for parts and £300 (3 hrs labour) for a 987 Boxster S. Seems step as that would be at same time as a major service in order to be able to add 2 year warranty so if they won't budge on price I'll be asking what happens if I get genuine Porsche parts fitted elsewhere before taking it to them (OPC) for service/ to add warranty...

[FisiP1]

Since its kind of a general topic.

Just changed the front discs and pads on my 2.7 for 147 quid all-in, taking advantage of the 30% offer on eurocarparts and doing the fitting myself, which was a complete doddle and took no more than 3hrs. Now I know some of the easy ways to get things off I could cut that down to about an hour.

[FlybyWyre]

x1 Far easier to change discs and pads on a 986,987 than a Toyota and not expensive for the bits.