Ford B-Max Forum banner
1 - 20 of 26 Posts

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #1 ·
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.
 

·
Registered
Joined
·
54 Posts
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. :smile: Simple .
 

·
Registered
Joined
·
242 Posts
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. :smile: Simple .
Much the same as round the bottom of your valve itself. Old, simple but effective things like this seem to be lost.
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #6 ·
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?
 

·
Registered
Joined
·
51 Posts
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...
 

·
Registered
Joined
·
712 Posts
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 ?
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #9 ·
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.
 

·
Registered
Joined
·
51 Posts
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
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #11 ·
Will stop off at another tyre shop when I pass one. There is another not far away I have used previously.
 

·
Registered
Joined
·
311 Posts
Leaks around the valves are quite common on the alloys used on the Bmax, and maybe some other models ?
I had a front wheel with a very slow pressure drop. I took it into my local tyre dealer, he removed the valve
cleaned the seating and replaced it. Now I have a similar problem with a rear tyre.
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #13 ·
Eventually got fed up with the pressure loss and had a standard valve put in. I was sure there was an option in the menu to turn the sensors off, but now found there isn't. I haven't checked the manual or anywhere else yet, but does anyone know how to turn the pressure warning system off ,e.g.removing a dedicated fuse, disconnecting a wire, etc.
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #14 ·
p.s. There is no fuse for the tyre sensors, so must be connected to a general system fuse.
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #15 ·
Any offers on this one? Maybe the sort of question that only Gremlin can answer?
 

·
Registered
Joined
·
712 Posts
Sorry, can't help on this one ...you could always put a small round sticker over the warning light !!!
 

·
Registered
Joined
·
448 Posts
I don't think you can turn off the tpms, since it's been mandatory for 'new' vehicles in EU since november 2014
but I think it can be turned off in the earlier cars.

ford changed from a wheel speed sensing system, to a valve mounted system, as tpms was becoming mandatory.

just putting a sticker over the light would be an MOT fail

as standard, ford valves with sensors have a rib on their rubber body, or are a bolt in type.

most informative (and readable) article I have is...
https://www.schradertpms.com/en-gb/company/press-room/tpms-legislation-overview-eu
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #18 ·
Thanks Gremlin. Not the answer I was hoping for, so may end up changing the valve again then.

As it happens, I am currently looking at a new Puma, so it may depend on whether I take the plunge or keep the BMax for another year or two.

B Max is due for a service in December, so I could ask them to replace the valve then depending on how annoying I find the start up warning. I'm not too bothered by the yellow 'I' light.
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #19 ·
Tyre dealer gave me the old valve and sensor, so i assume that if i give the sensor to Ford when it's serviced and MOT'd they will fit it to the new valve and not charge me for the whole thing.
 

·
Registered
Joined
·
1,100 Posts
Discussion Starter · #20 ·
Odd. went to the ford dealer to test drive the puma earlier and left the salesman my keys as security and to enable him to value the B Max.

When I left, the tyre pressure system warning had disappeared and hasn't appeared since. Did he find a way to switch it off or does it disable itself after a while? Strange coincidence if it did.

Thoughts?
 
1 - 20 of 26 Posts
Top