Brake Master Cyl Leaking

**d2dave** · 18th July 2025, 08:08 PM

I have just discovered my brake master cyl leaking. It looks like it is between the plastic reservoir and the steel cyl.

Some research suggests this is a common problem. I have 3 options.

1/ Replace just the rubber seals which I can get for $37

2/ Replace seals and plastic reservoir. $136 from UK

3/ I can get a complete master cyl from the USA for about $180.

My choice would be the $37 dollar option providing the old plastic doesn't break doing the job.

Anyone had experience doing this?

**Tins** · 18th July 2025, 08:40 PM

Not on a D2, but I have done it. You are correct that care is needed, but they aren't subject to stuff like UV so it should be ok. I have a spare one here I could practice on. I would try to get it warm before doing it.

**V8Ian** · 18th July 2025, 08:53 PM

I did it successfully on my D1, Dave. Probably the easiest job I've ever done on a Land Rover.

**d2dave** · 18th July 2025, 11:03 PM

Thanks Ian and John.

$37 option looks like the go.

**Tins** · 19th July 2025, 11:01 AM

Don't reckon a bloke of your talents will have an issue, Dave.

**AK83** · 19th July 2025, 01:26 PM

Very weirdly ... on the D2 when I got it from brother, it had the same leak.

I have a spares D2 and had the idea to change it out spares one.

This was a few years ago now, but from some inexplicable reason the leak just stopped!!
Obvious reason was maybe low on fluid, and I use a very light coloured Bosch fluid, so not easy to see through the reservoir, but nope. it was at the correct level.

I've done two pad changes in the time I've had the D2, and each time I've done a flush and nanocom bleed.
Maybe the new fluid stopped the leak???

**V8Ian** · 19th July 2025, 04:18 PM

Maybe it was the remnants of a previous overflow, Arthur.

**d2dave** · 19th July 2025, 04:20 PM

I might take the brake fluid out and put gear oil in. If it doesn't fix the leak, it will at least slow it down until the parts arrive.

**Tins** · 19th July 2025, 07:39 PM

Originally Posted by d2dave

If it doesn't fix the leak, it will at least slow it down until the parts arrive.

Or, alternatively, it won't slow down at all....

**RANDLOVER** · 20th July 2025, 12:33 AM

Originally Posted by d2dave

I might take the brake fluid out and put gear oil in. If it doesn't fix the leak, it will at least slow it down until the parts arrive.

That's funny and interesting as gear oil is mineral based, so might degrade the rubber hoses and seals,whereas brake fluid is glycol based, not vegetable oil based like I thought, although it used to be. I'm not sure if antifreeze would be a better substitute.

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