Tyre Pressure Drop - Ford B-Max Forum
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post #1 of 12 (permalink) Old 20th April 2020, 13:05 Thread Starter
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Tyre Pressure Drop

Back rear tyre always seemed to want an extra pound or two of pressure compared to the rest, but recently, the warning light came on and pressure had dropped to 17 lbs. Reinflated and 2 weeks later. Warning light came on again.

I couldn't see any sign of object penetration but I knew I had an old valve tool somewhere in the garage that I hadn't used in 15 years. A search located it and I gave the valve a slight tighten about a week ago. Pressure has remained up ever since, so it's worth checking the tightness of the valve insert if a tyre is going down before taking it to the tyre dealer.

Sometimes you get leakage around the beading or the valve seat, but not in this case.

B Max Titanium X 1.0 125 bhp in Magnetic with built in SatNav and rear sensors.
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post #2 of 12 (permalink) Old 20th April 2020, 19:31
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Thanks for the tip.

John

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post #3 of 12 (permalink) Old 5th May 2020, 01:26
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You can check the tyre valve by removing the cap, wet your finger and wipe it over the end of the valve making a bubble, if the bubble gets bigger it's leaking. Simple .
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post #4 of 12 (permalink) Old 7th May 2020, 17:03
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Quote:
Originally Posted by B-Max-Mike View Post
You can check the tyre valve by removing the cap, wet your finger and wipe it over the end of the valve making a bubble, if the bubble gets bigger it's leaking. Simple .
Much the same as round the bottom of your valve itself. Old, simple but effective things like this seem to be lost.

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post #5 of 12 (permalink) Old 8th May 2020, 00:46
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as I remember, mild washing up liquid is an even better diagnostic tool
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post #6 of 12 (permalink) Old 1st July 2020, 23:58 Thread Starter
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Tyre pressure is still dropping. Seems like the valve is leaking around the joint with the wheel. Corrosion I guess. Ford have said a new valve is 24 but the base (without the sensor) is 7. Plus they will probably charge main dealer rates to fit.

I'm thinking of deflating the tyre and removing the valve, then cleaning the seat and refitting. Is there anything I can put between the valve and the seat to improve the seal?

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post #7 of 12 (permalink) Old 2nd July 2020, 08:54
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hi cinpars......removing the valve will cause more damage..try a reputable independant..the valve can be separated from the sensor and replaced by itself..any good tyre shop could do this...

i used to be indecisive..now im not too sure
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post #8 of 12 (permalink) Old 2nd July 2020, 11:29
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I have a similar issue with one of my rears. I lose about 5 psi a week so i check it and reinflate regularly.( All other tyres o.k) I can see what i presume is rust just under the surface, around the valve. Not great is it ?

John

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post #9 of 12 (permalink) Old 2nd July 2020, 12:48 Thread Starter
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Thanks Maxfan. My tyre dealer (Discount Tyres) said they won't touch these valves even though I bought 2 tyres from them. They said to take it to the main dealer.

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post #10 of 12 (permalink) Old 2nd July 2020, 15:45
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hi cianpars..they are missing a trick..the valves can be bough easily and are easy to swap.just a screw to hold sensor..try a different place

i used to be indecisive..now im not too sure
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