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Post by rebel alliance » Sat May 25, 2019 5:50 pm

So out in the new forest today stuck in traffic jam..Engine bay hot enough to bring the fan on found the brake pedal going to the floor twice..second pump restored hard pedal.No loss of brake fluid so whats getting hot to cause this ?



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Post by AJL Electronics » Sat May 25, 2019 6:16 pm

When was the last time you changed the fluid? Over a couple of years it absorbs water. Then under pressure, the water turns to steam and of course steam is more compressible than brake fluid.


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Post by rebel alliance » Sat May 25, 2019 6:53 pm

I did put new calipers on six months ago by the time i bled the brakes front and back it would have put new fluid in...



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Post by rebel alliance » Sat May 25, 2019 6:55 pm

I will change the master before i use it again just to be safe



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Post by AJL Electronics » Sat May 25, 2019 7:37 pm

Could be torn rubbers in the master cylinder.


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Post by rebel alliance » Sat May 25, 2019 7:44 pm

Yes thats what i thought..its got hotter then it did today and never caused a loss of brakes



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Post by rebel alliance » Mon May 27, 2019 8:19 pm

Any recomendations for a brake master for a 72 5a i recall talk of land rover items but that may have been clutch....i know the traders have them but a bit pricy..



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Post by philhoward » Mon May 27, 2019 9:28 pm

I got one that was supposedly for a Landrover but I’ve never been able to find out which one..they all seem to be 0.75” or 1”, not the 0.875” you need.


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Post by philhoward » Mon May 27, 2019 9:30 pm



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Post by AJL Electronics » Mon May 27, 2019 10:12 pm

I have them in stock at a sensible price.


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Post by rebel alliance » Mon May 27, 2019 10:19 pm

If its more sensible then the other two i'll take one..does it include the plastic reservoir



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Post by rebel alliance » Mon May 27, 2019 10:22 pm

Did look at that one Phil but i did'nt know the correct bore size...By all accounts sudden loss of pedal points towards a master cylinder fault



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Post by rebel alliance » Sat Jun 01, 2019 2:32 pm

So update for anybody wanting to save a few Bucks.The master cylinder found by Mr Howerd on ebay is indeed correct for a 5a ...The only problem i had was the pedal fork was a bit tight on the threaded rod, maybe i have the wrong one but it did go on far enough after i cut 1/2" off the thread
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Post by Dennis Nicholas » Sun Jun 02, 2019 5:55 pm

The rod is usually just ball ended working against a hollowed out cup so could have just been cleaned up and put in the new cylinder?. I wonder if the new thread was a different pitch but not far off the old one's...metric instead of imperial?
Pity you can't be changing seals all round and then change to silicon fluid.....mine has been in both brakes and clutch for many years now and all untouched......don't have this frequent changing problem and silicone is reusable after bleeding after being left for any dirt to settle.

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