Swapping brakes

jonnyt · Feb 23, 2011

For those not keeping up with the rebuild (!), it was a 1987, 90 with a 3.5l V8.

That's being rebuilt at the moment on a 3.9l short engine. Anyway, attention is turning to the brakes. Front is sorted - I've got a zeus vented disc conversion kit with S/S pistons, new discs and pads (callipers are spaced as well to take the thicker discs).

On the back it was originally drum brakes and there is no conversion kit. So I've got myself an early discovery axle that is identical save for a few additional bits which will meet a sticky end with a grinder in due course!

Anyway that's obviously got disc brakes.

Short question is - do I need to do anything with the front / rear balance of the brakes in changing from drum to disc?

Thanks,

Jon

jamesmartin · Feb 23, 2011

no front has 4 pots per caliper rear has 2

wiltshire landyman · Feb 23, 2011

never had any probs when a put a rr disc braked rear axle on my fender

jonnyt · Feb 23, 2011

Hi Wiltshire. Thanks for that. Was that a straight swap for a fender rear axle with drum brakes? From what i can gather the RR brakes were 46mm dia pistons on the back so shouldn't be a problem with the 41mm pistons I've got.

Do you think there might be any benefit in putting a balance valve in the system?

Ta

wiltshire landyman · Feb 23, 2011

rr axle was a straight bolt on job..nothing else was needed

jai_landrover · Feb 23, 2011

If you want to you can go down the mathematical route working out pie radius to get a matched master cylinder/servo/calipers however most people just put it on and it works ok. I have 110 front calipers and std drums on the rear of my 90 and it will out brake most similar sized motors except RRC with the electric earth stopper of a brake pedal they have.

jonnyt · Feb 26, 2011

Thats good enough for me. Its not that tricky to put a balance valve in afterwards anyway I guess.

Thanks.

jamesmartin · Feb 26, 2011

110 had the larger piston ,the fact you got 4 x piston on front compared to 2 x on rear means that front has twice braking pressure than rear if pistons the same diametre which they would normally be

Swapping brakes

jonnyt

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jamesmartin

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wiltshire landyman

I’m back

jonnyt

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wiltshire landyman

I’m back

jai_landrover

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jonnyt

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jamesmartin

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