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Fufflenarnia

Member Since: 15 Feb 2020
Location: Redhill Surrey
Posts: 13

1991 Defender 90 V8 Petrol HT Auto Baltic Blue

Brake master cylinder 90 pre vs after 91

Hi,
My master cylinder on my '92 90 is leaking.
It looks like it has the pre90 cast master cylinder fitted not the later one as it should be (non abs).
Is the later master cylinder better? Will it fit my servo? Is it worth changing into what should be fitted?
Thanks all,

4th Jun 2020 3:49pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8033

2011 Defender 110 Puma 2.4 USW Stornoway Grey

if the mounting holes are in the same orientation then yes it will physically fit the servo.

also need to check the output from MC - is it 4 or 3 and the orientation of the pipes as they leave the MC, plus depends if you have steel or flexible brake pipes to make them match if they are of different orientation.

not sure if there is any advantage of the newer one., assuming ports are the same. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

4th Jun 2020 4:47pm

Fufflenarnia

Member Since: 15 Feb 2020
Location: Redhill Surrey
Posts: 13

Thanks James

4th Jun 2020 5:55pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2229

2002 Defender 110 Td5 DCPU Keswick Green

The two different master cylinders are not interchangeable as the stud positions on the servo are at a different angle.

They are slightly different piston bores (23.8mm vs 25.4mm) but the larger one was fitted from 91 (i.e. before rear discs were standard) so doesn't really matter which. I think the later ones are all three port and the earlier ones 2port so changing would need a servo and piping change. I would just use the same as the type you already have, just buy a good branded one! Steve 02' 110 TD5 Double Cab Rebuild Thread

4th Jun 2020 5:58pm

Fufflenarnia

Member Since: 15 Feb 2020
Location: Redhill Surrey
Posts: 13

Ok, that makes sense, a bigger bore would mean less pedal travel, but maybe a pressing harder.

That said, it does look like a faff!

I have a Delphi one priced up and on my basket, it seam the good old days of changing seals have gone!

4th Jun 2020 6:18pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2229

The trouble is that usually when they start leaking there will be corrosion and pitting within the cylinder bore so new seals won't last long at all.

Steve 02' 110 TD5 Double Cab Rebuild Thread

4th Jun 2020 6:30pm

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