mot failure :(

[g-mac-gti]

my car failed its mot today  reg bulb, welding and my nearside rear brake load sensing vavle linkage has seized! what the hell is that??? and how can i unseize it?

[Steve_B]

Do they mean the rear bias valve? If so there should be a few posts about it on here.

[cняis]

mine passed today... with a page full of advisories 

there are advantages to working for a car spares company with workshop and MOT testing station 

i had to keep mr MOT tester topped up with coffee!

[oakgreen_91]

The bias valve is easy to spot, it sits near the rear axle on the n/s - follow the brake pipes into it! 
You can the usual WD40 it to death approach, or buy a new one for about £30

Looks like this (when new):

[g-mac-gti]

mine passed today... with a page full of advisories 

there are advantages to working for a car spares company with workshop and MOT testing station 

i had to keep mr MOT tester topped up with coffee!

rub it in why dont you haha

[g-mac-gti]

cheers guys. well you know how it is, christmas comin up. ill try the cheap option...wd40 here i come

[AudiA8Quattro]

Use wd40 and a rubber mallet on the bias valve.

[Diamond Hell]

DON'T use WD-f*cking-40 on it!

Use something that *actually* has an effect - Plusgas, or another penetrating fluid.  You will have much better results.

When you get the brake unions cracked off you may want to rock them back and forth to make sure the union is separated from the pipe - nothing worse than twisting off the end of one of your brake pipes, is there?

[AudiA8Quattro]

Nothing wrong with using WD40 at all.
The valve probably won't even need replacing, i've sorted several before by just using wd40 and a rubber mallet to free it up.

[jacko16v]

Yeah it will free up with some lube and a good clean to get all the crap and rust out of the linkage