caliper rubbing on disc

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MarkHawkins
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caliper rubbing on disc

Post by MarkHawkins » Wed Aug 23, 2017 10:51 pm

After bolting on some reconditioned calipers I'm finding the caliper is pulled on to the disc causing it to rub. The disc, hub and bearings have not changed, only the caliper. Could I have missed something when remounting the hub? - it spins freely without the caliper. Is some form of shimming between the upright and caliper permissible? My assumption had been that calipers from a 5a would fit directly onto the coupe. I don't see any in a 5a workshop manual.


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caliper rubbing on disc

Post by scimjim » Wed Aug 23, 2017 10:56 pm

Calipers often need to be shimmed to ensure the disc runs centrally but they shouldn't be that far out that they rub?


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caliper rubbing on disc

Post by efi_sprintgte » Thu Aug 24, 2017 6:43 am

I'm 90% sure you will need 5a discs too as the offset is slightly different..

That being said it's fine to shim the calliper and or the disc to achieve central.


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MarkHawkins
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caliper rubbing on disc

Post by MarkHawkins » Thu Aug 24, 2017 9:04 am

We have 5a discs (new the other year). Would these need to be bolted to the coupe hub?
While looking closely at the rotation of the current coupe discs (well drivers side) I notice they appear slightly out of true - there is rubbing against the pads when they are pushed up close. I think this may explain the uneven pulling up under heavy braking.


Custodian of :

1968 '4b Coupe HBL 725G
1972 '5a M/overdrive ALJ 513K - ALJ 513K
1977 '6a M/overdrive - OPJ 62R

ex 1974 '5a auto - VLN 826M
ex 1985 GTC M/overdrive B205 AMT - number 413
ex 1984/85 SS1 number 0007 (1300)

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caliper rubbing on disc

Post by philhoward » Thu Aug 24, 2017 9:46 am

Shimming the calipers seems to work on them quite well - and don't be surprised if they aren't the same side to side. Ideally use actual shim washers (rather than generic washers) - readily available in 0.1, 0.5 and 1.0mm thickness - as they are considerable more uniform.

For example: these on ebay - IIRC they're 3/8" UNF bolts so use the 10mm ones.


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caliper rubbing on disc

Post by MarkHawkins » Thu Aug 31, 2017 10:00 am

Fitting the slightly used 5a discs (original drivers side one found to be slightly warped so explaining the tendency to lock up under heavy braking) and careful use of the washers (shims) that were removed seems to have got things turning smoothly without rubbing.


Custodian of :

1968 '4b Coupe HBL 725G
1972 '5a M/overdrive ALJ 513K - ALJ 513K
1977 '6a M/overdrive - OPJ 62R

ex 1974 '5a auto - VLN 826M
ex 1985 GTC M/overdrive B205 AMT - number 413
ex 1984/85 SS1 number 0007 (1300)

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