When is a brake disc too rusty

[MPETT]

I've got a set of 291mm discs on the front of my Tuscan and their inside edge is rusty. I've cleaned them up and I'm hopeful of being able to skim them as they are very expensive to replace. There is hardly any lip on the discs to indicate significant disc wear and the car has don 24k.

Has anyone had any experience of doing this? Has anyone enquired about the new RG discs prices?

Before:




After:

[Guillotine]

Skim will be fine.

[MPETT]

Cheers Andy. I thought as much! That saves me a few bob in my restoration!

[Guillotine]

ask whoever does it if they can give the insides of the bell and rotor a waz in the blast cabinet first, to take off the loose crud. NOT the contact area obviously.

cheers

[neal1980]

I happen to have a set that I no longer need, came as a complete hub assembly which I only nicked the calipers off.

Do you a nice deal if you like...Need to check them first but remember them being fine.

Regards

Neal

[dvs_dave]

Just had mine skimmed and they came up a treat, however you might want to consider upgrading to the later larger and cross drilled 322mm discs? They're a straight swap with the spacer added to the caliper mount and bizarrely they're cheaper than the old 291mm discs.

[scotty_d]

dvs_dave said:

Just had mine skimmed and they came up a treat, however you might want to consider upgrading to the later larger and cross drilled 322mm discs? They're a straight swap with the spacer added to the caliper mount and bizarrely they're cheaper than the old 291mm discs.

Wish i knew this a few months ago

Where can you get the spacer or do you know what size it is?

[Basil Brush]

Not all the early callipers fitted to the 291mm disc cars will take the 322mm discs. There are apparently 2 versions of the early calliper with a different inner radius of the calliper body.

The spacer is 15.5mm, ie half of the increase in disc diameter.

[dvs_dave]

The usual TVR parts suppliers sell the spacers and they cost about 20 quid for the pair.

With regards the calipers, if they have "TVR" cast into the face of them then you're good to go for the larger discs. The ones with "AP Racing" cast into the face I'm not sure, however it's worth noting that the ones with "TVR" cast into them still have "AP Racing" cast on the inner face of the caliper. I don't know if there's any differences other than that.

Your local friendly TVR parts supplier and specialist will be able to confirm.

[scotty_d]

dvs_dave said:

The usual TVR parts suppliers sell the spacers and they cost about 20 quid for the pair.

With regards the calipers, if they have "TVR" cast into the face of them then you're good to go for the larger discs. The ones with "AP Racing" cast into the face I'm not sure, however it's worth noting that the ones with "TVR" cast into them still have "AP Racing" cast on the inner face of the caliper. I don't know if there's any differences other than that.

Your local friendly TVR parts supplier and specialist will be able to confirm.

Cheers will bear this in mind next time round and go for the bigger Disc's

[Basil Brush]

Does anyone supply off the shelf spacers to swap from 291 discs to 322? I've seen them on Power's site to swap from 304 discs but ended up making my own 16mm ones.

I see RG are doing cross drilled 291mm AP discs for 160 quid each and their own spec 322s for 140 quid. Not sure who makes their discs?

Edited by Basil Brush on Thursday 22 December 11:03

[rev-erend]

Is there a minimum thickness stamped on the disc anywhere .. its worth checking them as
owners sometimes grind off the lip ..